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14,802 |
Discovery of 10 ASAS-SN Supernova Candidates
|
J. Brimacombe (Coral Towers Observatory), P. Cacella (DogsHeaven Observatory), P. Vallely, K. Z. Stanek, C. S. Kochanek, Z. Way, D. Desai, S. Bose, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, Ping Chen (KIAA-PKU), M. Stritzinger, S. Holmbo (Aarhus), B. Nicholls (Mt. Vernon Obs., New Zealand)
|
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from the quadruple 14-cm telescopes "Brutus" in Hawaii, "Leavitt" in Texas, "Payne-Gaposchkin" in South Africa, and "Cassius" and "Paczynski" in Chile, we discovered several new transient sources. Properties of these sources, as well as associated finding charts showing archival imaging (left) and a follow-up confirmation image (right) are included in the table below:
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-21xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-21xx (AT 2021xyz) to preserve, rather than anonymize, the origin of the transient.
We would like to thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University, NSF grants AST-1515927 and AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.
|
2021-07-21 03:34:00
|
optical,supernovae,transient
|
2021-07-21
|
03:34:00
| 1,489 |
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] | 14,800 |
14,803 |
ASASSN-21nn: An Unusual Dimming Event in a Red Giant Star
|
M. Rizzo Smith, T. Jayasinghe, K. Z. Stanek, C. S. Kochanek, D. Rowan, C. Christy, D. Desai, Z. Way, T. A. Thompson (OSU), B. J. Shappee (Univ. of Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus)
|
During the ongoing All-Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014, Kochanek et al. 2017), using data from the quadruple 14-cm ``Cassius'', ``Payne-Gaposchkin'', and ``Paczynski'' telescopes, we identified a stellar source undergoing a deep dimming episode. The source ASASSN-21nn (RA=18:49:15.54, DEC=-47:32:50.7, d~6.2 kpc, Teff=4075 K, BP-RP=1.73 mag, G=12.04, EDR3 source_id=6704449549694340352) is bright and red in Gaia DR2 (Gaia Collaboration et al., 2018, A&A, 616, A1) leading it to be classified as a red giant in the TESS Input Catalog (Stassun, K. G., et al., 2019, AJ, 158, 138). It was first observed by ASAS-SN on UT 2014-04-29. Presently, ASASSN-21nn has more than ~2800 data points.
ASASSN-21nn has a quiescent mean magnitude of g~13.3 (V~12.6). The latest ASAS-SN photometry shows that ASASSN-21nn gradually faded from g~13.3 on UT 2021-07-05, to g~13.6 on UT 2021-07-15 and is still in its dimmed state as of UT 2021-07-19. Over the previous ~2800 days, the source had no significant drops in its ASAS-SN g or V-band brightness.
We detect a periodic signal in the ASAS-SN V and g-band data at ~241 days and ~233 days and peak-to-peak amplitudes of ~0.30 mags and ~0.25 mags respectively. There are no matches in Vizier or AAVSO to a previously known variable star.
We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grant GBMF5490 to the Ohio State University, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA)
|
2021-07-22 00:37:00
|
optical,star,supernovae,variables
|
2021-07-22
|
00:37:00
| 1,724 |
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] | 14,801 |
14,804 |
Spectroscopy and photometry of nova V5856 Sgr, still 9 mag brighter than quiescence five years past the initial outburst
|
Ulisse Munari (INAF-Padova), Robert Williams (STScI and UCSC), Paolo Valisa and Sergio Dallaporta (ANS Collaboration)
|
Nova V5856 Sgr (= ASASSN-16ma = Nova Sgr 2016 N.4) erupted on 2016 Oct 25 (Stanek et al. 2016, ATel #9669), peaked at B=6.25, V=5.90, I=5.59 on Nov 8, and after a second maximum at V=6.51 reached seven days later, it entered a fast decline characterized by t(2)=6.5 and t(3)=10.5 days (Munari et al. 2017, MNRAS 469, 4341). The progenitor was not detected in quiescence by OGLE (I>22 mag; Mroz et al. 2016, Atel #9683), implying an outburst amplitude >16 mag in I-band. While passing through the secondary maximum, the nova emitted strongly in the gamma-rays as recorded by Fermi-LAT (Li et al. 2017, NatAs 1, 697).
We have recently re-observed V5856 Sgr and found that it is still very bright five years after the eruption: in I-band the nova is currently 7.0 mag down from maximum and at least 9.5 mag brighter than in quiescence. We have obtained the following photometry on the Landolt system with ANS Collaboration telescope ID 0310:
The ASASSN light-curve (Shappee et al. 2014, ApJ 788, 48; Kochanek et al. 2017, PASP 129, 104502) confirms that around mid-2017 the nova drastically reduced its rate of decline, losing only about 1 mag since then.<\p>
A low resolution spectrum (3200-8000 Ang, 2.3 Ang/pix) of V5856 Sgr was obtained on 2021 July 10 with the Asiago 1.22m telescope, and Echelle spectra (4300-8700 Ang, res. power 20,000) were recorded on 2021 July 18 and 19 with the Varese 0.84m telescope. They are characterized by a blue continuum (in agreement with the low reddening affecting the nova and the blue colors of the above photometry) with superimposed strong emission lines primarily from [OIII], Balmer, HeI, [OII], [NII], 4640 blend, and HeII. The integrated flux of some of them is /p>
In our spectra H and He emission lines possess a prominent narrow central spike (FWHM from 60 to 100 km/s) superposed on a broad Gaussian pedestal having FWHM=1050 km/s. The central spike is absent in forbidden lines, which are characterized by a broad component with FWHM=1200 km/s and a more rectangular shape. Inspecting the SMARTS database (http://www.astro.sunysb.edu/fwalter/SMARTS/NovaAtlas/v5856sgr/v5856sgr.html) reveals that the central peak to H and HeI lines is present over the whole 2017 Jul 22 to 2019 May 27 period the nova was monitored, and always absent in forbidden lines.
The fact that the nova is still so bright five years past the initial eruption suggests that nuclear burning could still be going on the surface of the central WD, and the broad component observed in the emission lines probably form in a sustained wind blowing off the WD. The narrow component is instead probably associated with the central binary and/or the innermost circumstellar regions, and repeated Echelle observations will be valuable to ascertain if the narrow component display variation in radial velocity.
|
2021-07-22 23:59:00
|
optical,gamma ray,binary,nova
|
2021-07-22
|
23:59:00
| 2,827 |
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] | 14,802 |
14,805 |
Strong UV Neon lines in the spectrum of Nova Herculis 2021
|
P. Ochner, V. Andreoli, A. Farina (UniPd), A. Reguitti (UNAB)
|
We report additional spectroscopic follow-up observations of Nova Herculis 2021 (V1674 Her, TCP J18573095+1653396). We obtained a low-resolution spectrum with Asiago 1.22-m 'Galileo' telescope + B&C spectrograph (330-780 nm, resolution 0.7 nm) on 20 July 2021.
The spectrum shows extremely intense emission lines from [Ne V] 342.6 nm and 334.6 nm. We measured the fluxes from the [Ne V] 342.6 nm and Halpha lines, and calculated a ratio of about 4.5. The [Ne V] 334.6 line is also prominent, with a flux that is nearly double that of Halpha. We carefully inspected the sensitivity function and the data reduction steps to ensure the flux calibration in the UV part of the spectrum was correct. Together with the lines from the Balmer series (up to Hdelta), we also identify strong lines from [Ne III] 386.9 nm and 396.7 nm (probably blended with Hepsilon), He II 468.6 nm and a broad [O III] 500.7 nm feature. The detection of numerous Neon lines is consistent with the classification of Nova Herculis 2021 as a Neon nova (Wagner et al. 2021, ATel #14746). Numerous lines still present a boxy profile (see Albanese et al. 2021, ATel #14718). The Halpha line has a FWHM velocity of 4000 km/s, while from the Neon lines we derive a slightly higher velocity of 5000 km/s. The recent announcement of soft X-ray emission from Nova Herculis 2021 (Page et al. 2021, ATel #14747, Pei et al. 2021, ATel #14798) with a temperature between 700,000 K and a million K may explain the high ionization features and the strength of the Neon forbidden lines in the UV.
Ultraviolet spectroscopy and photometry of Nova Herculis 2021 is encouraged.
The observations were performed in the framework of the ASYAGO Summer School. The spectrum can be visualized at the link below.
|
2021-07-23 16:55:00
|
optical,ultra-violet,x-ray,nova,transient
|
2021-07-23
|
16:55:00
| 1,759 |
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] | 14,803 |
14,806 |
A new Glitch in the Vela Pulsar (PSR B0833-45/PSR J0835-4510)
|
V. Sosa-Fiscella (IAR, ARG - RIT, USA), E. Zubieta (UBA, ARG), S. del Palacio (IAR, ARG), F. Garcia (RUG, NL), F. A. Lopez-Armengol (RIT, USA), J. A. Combi (IAR - FCAGLP, ARG), C. O. Lousto (RIT, USA), G. Gancio (IAR, ARG), L. Combi (IAR, ARG), E. Gutierrez (IAR, ARG), A. Simaz Bunzel (IAR, ARG), F. Hauscarriaga (IAR, ARG), on behalf of the PuMA Collaboration.
|
We report here the detection of a new glitch in the Vela pulsar (PSR B0833-45/PSR J0835-4510) with the two single-dish 30 meter antennas Varsavsky (A1) and Bajaja (A2) of the Argentine Institute of Radioastronomy (IAR) as a result of a daily-monitoring performed by the PuMA Collaboration (Pulsar Monitoring in Argentina). The observations reported here are double-polarization, at 1.4 GHz, with a 56 MHz bandwidth. We observed the Vela PSR on Jul 21 (MJD 59416.6321) for ~3 hr and measured a barycentric period of P_bary = 89.4086241(17) ms, consistent with our ephemeris before the glitch. No glitch was observed during this observation, which ended in MJD 59416.7666. In our first post-glitch observation performed on Jul 22 (started in MJD 59417.6549), we obtained a period P_bary = 89.4065093(15) ms, showing a decrease of DeltaP = 0.113 us with respect to the expected period. This result was confirmed with a subsequent observation on Jul 23. This preliminary analysis places this new Vela glitch of DeltaP/P = 1.26e-6 between MJD 59416.7666 and MJD 59417.6549. We will continue performing daily monitoring of the Vela PSR at 1.4 GHz during the glitch recovery phase.
|
2021-07-24 04:46:00
|
radio,pulsar
|
2021-07-24
|
04:46:00
| 1,174 |
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] | 14,804 |
14,807 |
Confirmation of glitch event observed in the Vela pulsar (PSR J0835-4510)
|
L. Dunn (University of Melbourne, "UMelb"), D. Campbell-Wilson (Woodchester Observatory), C. Flynn (SUT), G. Howitt (UMelb), Y. S. C. Lee (UMelb), A. Melatos (UMelb), P. Meyers (UMelb), M. Bailes (Swinburne University of Technology, "SUT"), T. Bateman (SUT), C. Day (SUT), A. Deller (SUT), A. J. Green (University of Sydney), V. Gupta (SUT), A. Jameson (SUT), M. E. Lower (SUT), A. Mandlik (SUT), D. C. Price (SUT), R. Sekhri (Alphington Grammar School), A. Sutherland (SUT), G. Torr (SUT), G. Urquhart (SUT)
|
At Molonglo Observatory Synthesis Radio Telescope (MOST) near Canberra, Australia, we carry out a pulsar timing programme in which we observe a large number of pulsars with near-daily cadence, as part of the UTMOST project (Bailes et al. 2017). Observations are at a central frequency of 831 MHz and with a bandwidth of 45 MHz.
We confirm the detection of a glitch in PSR J0835-4510, recently reported by Sosa-Fiscella et al. (ATel #14806). Our first post-glitch observation was taken at MJD 59418.11 (2021-07-23 UTC). Our preliminary analysis shows a change in its rotation frequency on MJD 59417.628 +/- 0.002 (2021-07-22 UTC) by delta F0/F0 = (1.26 +/- 0.03) E-6.
The glitch was also confirmed at Woodchester Observatory's 6-meter radio telescope (located near Adelaide, Australia), operating at 820 MHz with a bandwidth of 7 MHz. Observations before and after the glitch were made at MJD 59417.14 and MJD 59418.13.
We will continue to monitor the pulsar and we encourage other observers to help resolve the pulsar's glitch recovery.
References: Bailes, M, et al., 2017, PASA, 34 e045.
|
2021-07-24 14:41:00
|
radio,pulsar
|
2021-07-24
|
14:41:00
| 1,092 |
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] | 14,805 |
14,808 |
Glitch event in the Vela pulsar (PSR J0835-4510) observed at HawkRAO
|
Steve Olney (Hawkesbury Radio Astronomy Observatory)
|
Hawkesbury Radio Astronomy observatory (HawkRAO) is an amateur facility near Sydney, Australia carrying out observations of the Vela pulsar with daily cadence extending over more than 4 years. Observations are at a central frequency of 436 MHz and with a bandwidth of 2.4 MHz. The antenna is a fixed transit mode array of four 42-element Yagis.
We confirm the detection of a glitch in PSR J0835-4510, recently reported by Sosa-Fiscella et al. (ATel #14806) and Dunn et al. (ATel #14807). Our last pre-glitch observation ended at MJD 59417.126 (2021-07-22 UTC) and our first post-glitch observation started at MJD 59418.081 (2021-07-23 UTC). These epochs are consistent with observation times given in ATels #14806 and #14807 and the glitch epoch given in ATel #14807 of MJD 59417.628. Our preliminary analysis shows a change in its rotation frequency by delta P0/P0 = (1.25 +/- 0.1) E-6. Two following observations (2021-07-24 UTC and 2021-07-25 UTC) returned a delta P0/P0 = (1.25 +/- 0.1) E-6 and delta P0/P0 = (1.30 +/- 0.1) E-6 respectively.
We will continue to monitor the pulsar to refine our estimate of the glitch magnitude.
|
2021-07-26 16:08:00
|
radio,pulsar
|
2021-07-26
|
16:08:00
| 1,134 |
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] | 14,806 |
14,809 |
MAXI/GSC observation of the onset of a possible giant outburst from Be/X-ray binary pulsar EXO 2030+375
|
M. Nakajima (Nihon U.), T. Mihara (RIKEN), H. Negoro, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC)
|
On 2021-07-20 (MJD 59415), the MAXI/GSC nova-alert system (Negoro et al. 2016) triggered on a faint X-ray activity from the Be/X-ray binary pulsar EXO 2030+375. EXO 2030+375 has been showing the normal outburst at every periastron passage (~46 days periodicity; Wilson et al. 2008) after the orbital phase shift of the outburst in 2016 (See Laplace et al. (2017) for long-term light curve). Since the regular normal outburst lasts for ~10 days, the source is in quiescent state in the other orbital phase. However, after the last periastron passage (MJD 59384), the source flux did not return to the quiescent state, and stayed constant at ~20 mCrab (4-10keV). This low flux state lasted for ~20 days until 2021-07-23 (MJD 59418, or orbital phase of ~0.7), and then, the source flux started to brighten with the increase rate of 10 mCrab/day. The onset phase of the current outburst is ~10 days (or 0.2 orbital phase) earlier than that of the nominal outburst. In addition, we notice that the current outburst nicely traces the previous giant outburst in 2006 (see, http://maxi.riken.jp/figure/exo2030/exo2030_lc_gobprofile.png ). Therefore, another giant outburst would be taking place. The next periastron passage is 2021-08-03 (MJD 59429). We encourage multi-wavelength observations to reveal the physical mechanisms of the giant outburst. The latest X-ray light-curve can be checked at the following pages; MAXI ( http://maxi.riken.jp/pubdata/v7lrkn/J2032+376/index.html ), Swift/BAT ( https://swift.gsfc.nasa.gov/results/transients/EXO2030p375/ ), Fermi/GBM ( https://gammaray.nsstc.nasa.gov/gbm/science/pulsars/lightcurves/exo2030.html ), and the BeXRB monitor page ( http://integral.esac.esa.int/bexrbmonitor/Plots/sim_plot_EXO2030+375.html ).
|
2021-07-26 19:58:00
|
x-ray,binary,neutron star,nova,pulsar,star,transient
|
2021-07-26
|
19:58:00
| 1,750 |
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] | 14,807 |
14,810 |
SALT high resolution spectroscopy of the fading transient ASASSN-21nn
|
D. A. H. Buckley (South African Astronomical Observatory/University of Cape Town)
|
On 2021 July 24, beginning at 18:06:08 UTC, a 1069 s spectroscopic observation was obtained under the SALT Large Science Program on transients of ASASSN-21nn, a fading red giant reported by Rizzo Smith et al. (2021; ATel#14803). The High Resolution Spectrograph was used, covering a spectral range of 3800-8900 Å at a resolution of R = 14,000. The spectrum looks typical of a late type star, but with the addition of a shell line for Hα, with emission peaks separated by ~2 Å and a deep central absorption reversal of E.W. = 0.75 Å FWHM = 0.75 Å and with a minimum flux of ~12% of the continuum. There are no other emission or shell features seen and Hβ only appears as a narrow absorption line, similar to the absorption component seen in Hα.
|
2021-07-26 20:13:00
|
optical,star,transient
|
2021-07-26
|
20:13:00
| 743 |
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] | 14,808 |
14,811 |
AstroSat observations of GRS 1915+105 during the recent re-brightening phase
|
Ravishankar B. T. (U R Rao Satellite Centre, Bengaluru), Tilak Katoch (Tata Institute of Fundamental Research, Mumbai), Athulya M. P. (Dayananda Sagar University, Bengaluru), Radhika D. (Dayananda Sagar University, Bengaluru), Vivek K. Agrawal (U R Rao Satellite Centre, Bengaluru), Anuj Nandi (U R Rao Satellite Centre, Bengaluru)
|
The enigmatic black hole X-ray binary GRS 1915+105 which had been in activity for more than two decades ever since its discovery in 1992, had stopped showing significant variability for more than two years since March 2019. Even during the longest low flux phase, the source has been displaying sudden flaring activities, with the most recent such activity begun since 2021-07-05 UTC and was reported with detection of a Low Frequency Quasi-periodic Oscillation (LFQPO) at 0.17 +/- 0.01 Hz by NICER (ATel #14792, Neilsen et al. 2021). The MAXI flux of the source had shown a gradual increase from 0.2 to 0.4 photons/cm^2/s since 2021-07-05 UTC. We proposed for a follow-up observation with AstroSat during the period of 2021-07-22 18:39:17 UTC (MJD 59417.77) to 2021-07-24 15:31:47 UTC (MJD 59419.64). At the beginning of the AstroSat observations, the nearest MAXI flux in 2.5 - 10 keV band available is on 2021-07-22 17:46:16 UTC (MJD 59417.74) at 0.15 +/- 0.07 photons/cm^2/s (~ 61.6 mCrab). During the AstroSat observations, from the available MAXI data points, we noticed that the flux values have increased to 0.22 +/- 0.02 photons/cm^2/s (~ 88 mCrab) on 2021-07-23, and 0.32 +/- 0.02 photons/cm^2/s (~ 129.17 mCrab) on 2021-07-24. The preliminary analysis of the AstroSat/LAXPC observations have been performed. We noticed significant variation in the power density spectrum (PDS) during the 2 days of AstroSat observation period. On MJD 59417.77, the PDS obtained for 3 - 80 keV energy range and in 0.002 - 10 Hz frequency range, revealed a strong LFQPO of 0.16 Hz (Q-factor of 2.8, amplitude of 8.7%, significance of 10.5), with the total rms variability of 12.5%. While, during MJD 59419.39, we found significant variation in the nature of the PDS, with the QPO frequency increased to 0.186 Hz (Q-factor = 3.27, amplitude = 19.6%, significance = 10.6) and the total rms variability increased to 31.3%. The source energy spectra in 3 - 25 keV band, comprised of a thermal multi-colour disc black body (modelled with diskbb) and a Comptonised component (modelled with nthcomp). During the first observation on MJD 59417.77, the spectral fit resulted in a disc temperature (Tin) of 1.09 (-0.03,+0.02) keV, photon index (Gamma) of 2.13 +/- 0.03 with the electron temperature (kTe) at 3.64 +/- 0.09 keV. The source unabsorbed flux in 3 - 25 keV band was calculated to be of 2.45e-9 erg/cm^2/s. Two days later (MJD 59419.39), the spectral parameters varied to Tin = 0.98 +/- 0.08 keV, Gamma = 2.94 +/- 0.03 and kTe = 11.5 +/- 1 keV. The unabsorbed source flux was seen to have increased to 3.58e-9 erg/cm^2/s. A fluorescent emission (Fe-line) varying in the energy range 6.46 - 6.67 keV during the observation period was also evident in the energy spectra. All the errors are quoted at 90% confidence interval. Even though the obscuration signature was not observed in the LAXPC spectra, it will be further explored considering broad-band spectral data using SXT and LAXPC of AstroSat. The preliminary results of AstroSat observations can be found at https://www.issdc.gov.in/docs/as1/ATel_GRS1915_plots_v2.pdf. Considering the gradual increase in source flux and variation of the spectral and temporal characteristics, we encourage multi-wavelength observations to monitor for any further changes in the source behaviour. We thank the AstroSat Time Allocation Committee, Satellite operations team, and ISSDC team for the quick response to our ToO proposal and data release.
|
2021-07-26 23:48:00
|
x-ray,binary,black hole,transient
|
2021-07-26
|
23:48:00
| 3,478 |
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] | 14,809 |
14,812 |
Confirmation of recent glitch in PSR J0835-4510(Vela) at 325 MHz using Ooty Radio telescope (ORT)
|
Jaikhomba Singha (IIT Roorkee, India), Bhal Chandra Joshi (NCRA-TIFR, India), Paramasivan Arumugam (IIT Roorkee, India), Debades Bandyopadhyay (SINP, India)
|
The Ooty Radio telescope (ORT) observes PSR J0835-4510 at 325 MHz frequency with 16 MHz bandwidth. Recently, a glitch was reported in this pulsar by Sosa-Fiscella et al. (ATel #14806), Dunn et al. (ATel #14807) and Olney et al. (ATel # 14808). We confirm the detection of the glitch in this pulsar using the ORT. Our preliminary analysis show that the glitch epoch is 59417.618 and the fractional glitch magnitude, DeltaF0/F0 is (1.238 +/- 0.07)E-6. Our estimate for spin-up in the glitch are close to ones that have been reported previously. We are continuing to monitor this pulsar to get better estimates of these parameters. We urge other monitoring programs to continue the same so that we can track its recovery further. A plot of the timing residuals of the pulsar is given in the following link.
|
2021-07-27 01:23:00
|
radio,pulsar
|
2021-07-27
|
01:23:00
| 803 |
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] | 14,810 |
14,813 |
Comet C/2017 K2 (PanStarrs) shows jet-shaped dust emissions modulated by extremely slow rotation at greater-than-usual distance from the Sun
|
Federico Manzini (Stazione Astronomica di Sozzago), Virginio Oldani (Stazione Astronomica di Sozzago), Paolo Ochner (Padova University), Luigi R. Bedin (INAF-OAPd), Andrea Reguitti (UNAB; INAF-OAPd)
|
Comet C/2017 K2 (PanStarrs), coming from the Oort cloud, is approaching the Earth and the Sun towards its perihelion, that will occur on 20 December 2022. Following the observation of an asymmetric coma and of two jet-shaped structures on the nucleus of the comet on 12 September 2020 with the INAF-OAPd 1.82-m Copernico telescope (Osservatorio Astrofisico di Asiago, Italy) (ATEL #14026), we performed a deep analysis of publicly released images taken by the Hubble Space Telescope (HST, PI David Jewitt) with the WFC3 camera and the F350LP broadband filter during eight observation sessions between 17 March 2018 and 18 December 2020. Each observing session was performed during one HST orbit and provided six images that were co-added after being cleaned of cosmic rays and defects in order to obtain a uniform background. The image resolution ranged between 232 and 417 km/pixel. The analysis of the images, performed by applying a Larson-Sekanina filter (with alpha=45 deg) and a 1/rho filter, showed a relatively stable activity of the comet during the entire 33-month period, characterized by the presence of two radial structures (probably dust emissions) located roughly south-east and west of the nucleus (Figure 1). The first of the two structures had always been more evident, so made it possible to accurately measure its position on each image, which showed a cyclic oscillation, between PA 110 deg and PA 190 deg, with a period of about 156 days (Figure 2), suggesting an extremely slow rotation of the nucleus. A computer modeling of the comet, performed by means of a proprietary software (Fase6), showed that the structures observed on the images could be due to two different active emission sources, one located at mid latitude and one near-polar on the nucleus, with a spin axis approximately directed towards PA 150 deg and with an inclination of about 30-40 deg from the plane of the sky. Both structures developing from the two active areas showed a wide curvature, which must have formed due to the slow 156-day rotation of the nucleus, given the negligible effect of the solar radiation pressure at the distance of the comet from the Sun in the analyzed period (between 14.33 and 7.55 AU). The mechanism of a possible dust emission at this distance is unknown and deserves further investigations.
Figure captions. Figure 1. The original HST images taken on 2020.10.06, with F350LP filter, were stacked on the optocenter of the comet C/2017 K2. The stack was treated with a LS algorithm (alpha=45 deg) and a Gauss smoothing filter (sigma=2). The structure actually in PA 170 deg about was measured as described in the text. Figure 2. Plot of the measured position angles (measure error of 10 deg) of the southeast structure over the observation period. The dotted line is a sinusoidal fit, showing a period of 156 days (R^2=0.981).
Figures are available at:
|
2021-07-27 18:46:00
|
optical,comet,cosmic rays,the sun
|
2021-07-27
|
18:46:00
| 2,884 |
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] | 14,811 |
14,814 |
Erratum to ATEL #14813: Comet C/2017 K2 (PanStarrs) shows jet-shaped dust emissions modulated by extremely slow rotation at greater-than-usual distance from the Sun
|
Federico Manzini (Stazione Astronomica di Sozzago), Virginio Oldani (Stazione Astronomica di Sozzago), Paolo Ochner (Padova University), Luigi R. Bedin (INAF-OAPd), Andrea Reguitti (UNAB; INAF-OAPd)
|
In ATel #14813, the link to the figures discussed in the text was missing. The link is: https://web.oapd.inaf.it/bedin/files/PAPERs_eMATERIALs/ATel/C2017K2_II/00_C2017_K2_ATEL_2_figures.pdf
We apologize for the inconvenience.
|
2021-07-28 17:01:00
|
optical,comet,the sun,a comment
|
2021-07-28
|
17:01:00
| 226 |
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] | 14,812 |
14,815 |
ATCA radio detection of the new X-ray transient Swift J1729.5-3223
|
Thomas Russell, Melania Del Santo, Antonino DAi, Elena Ambrosi, Alberto Segreto (INAF/IASF Palermo), Alessio Marino (Palermo University), Arash Bahramian (ICRAR/Curtin)
|
Following the recent discovery of the new X-ray transient Swift J1729.5-3223 (Atel #14791), we observed the field with the Australia Telescope Compact Array (ATCA).
Observations were carried out on 2021-07-21 between 10:39:50 UT and 13:48:50 UT (MJD 59416.51 +/- 0.07). ATCA was in its compact H168 configuration. Data were recorded simultaneously at two basebands, with central frequencies of 5.5 GHz and 9 GHz, and 2 GHz of bandwidth at each frequency band. PKS 1934-638 was used for bandpass and flux calibration, while the nearby (2.84 degrees away) source TXS 1714-336 was used for complex gain calibration. Data were edited and calibrated following standard procedures within the Common Astronomy Software Package (CASA, version 5.1.0; McMullin et al. 2007). Imaging was carried out with a Briggs robust parameter of 0. Due to the compact array configuration of ATCA, the isolated antenna 6 was used. These choices provided a synthesized beam of 7âx0.9â with a position angle of 4.7 deg at 5.5 GHz and 4.3âx0.6â at 4.6 deg at 9 GHz.
We detected a radio counterpart entirely consistent with the enhanced Swift-XRT position (of R.A. (J2000) = 262.39377 deg, and Dec (J2000) = -32.37359 deg, with a 90% error radius of 2.5â). Fitting for a point source in the image plane, our best radio position (measured at 9 GHz) of: R.A. (J2000) = 17:29:34.50 +/- 0.07â Dec. (J2000) = -32:22:25.59 +/- 0.44â, where uncertainties are systematic and statistical errors added in quadrature. A similar position was found at 5.5 GHz.
We measure flux densities of 180 +/- 22 μJy at 5.5 GHz and 100 +/- 20 μJy at 9 GHz, providing a radio spectral index of α = 1.3 +/- 0.7 (where Sν ∝ να), consistent with a optically-thin synchrotron emission from a transient jet. Our radio detection translates to a 5 GHz radio luminosity of ∼7.8E29 (D/8kpc)2 erg s-1 (Lr = 4 π d2 ν Sν).
Swift-XRT observed the source 2 days later (on 2021-07-23). These X-ray data were well fit with a simple absorbed powerlaw (tbabs x powerlaw) with NH = (3.1 +/- 0.7)x1022 cm-2 and an X-ray photon index of 1.6 +/- 0.3, providing an unabsorbed 1-10 keV flux of (6.3 +/- 0.5)x10-11 erg cm-2 s-1, marginally fainter than the previous XRT observations reported in ATel #14791. The X-ray flux corresponds to an X-ray luminosity of ∼4.8E35 (D/8kpc)2 erg s-1 (1-10 keV).
The X-ray spectrum and luminosity are consistent with a typical hard X-ray state at low-Eddington luminosity. This state is associated with a compact, steady jet. However, our measured radio spectral index is most consistent with optically-thin spectra expected for a transient jet (α ∼ -0.7), typically observed at much higher X-ray luminosity during the hard to soft state transition. Although the general radio/X-ray correlation does not apply for transient jet emission, the radio and X-ray luminosities would place Swift J1729.5-3223 at a position on the radio/X-ray plane consistent with it being either a black hole or neutron star X-ray binary.
Further observations are planned. Multiwavelength support is encouraged.
We thank Jamie Stevens and ATCA staff for making this observation possible. We acknowledge the Gomeroi people as the traditional owners of the ATCA observatory site. We also thank the Neil Gehrels Swift Observatory team for making the X-ray observation possible.
|
2021-07-29 21:57:00
|
radio,x-ray,binary,black hole,neutron star,star,transient
|
2021-07-29
|
21:57:00
| 3,329 |
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] | 14,813 |
14,816 |
Nova TCP J20210770+2914093 turns into an FeII-type as it keeps rising in brightness
|
U. Munari (INAF Padova), S. Moretti, A. Maitan, V. Andreoli (ANS Collaboration)
|
The transient TCP J20210770+2914093 was discovered by K. Itagaki on 2021 Jul 16.492 UT at unfiltered magnitude 12.0, and classified as a nova by Munari et al. (ATel #14793) based on a spectrum taken on July 17.102 UT.
This initial spectrum resembled novae of the He/N type, with Balmer, HeI, and NII lines present in emission. However, Munari et al. (ATel #14793) warned that with the nova possibly still progressing toward maximum light, the spectral type could evolve toward the FeII type. This has been indeed what happened and here we report about the evolution of the nova during the last two weeks.
We have been monitoring the nova at daily cadence in BVRI bands with various ANS Collaboration telescopes, primarily ID 1205, 2202, 2203, and 3600. After an initial decline of 0.7mag to a minimum brightness reached around July 18.8/19.0 UT (two and a half days past discovery), the nova has since then steadily rised in brightness, being now two mag brighter than the initial minimum. The following are excerpts at representative dates from our monitoring:
Spectra of TCP J20210770+2914093 have been collected at various dates with various instruments, in particular on July 18.944 and 28.942 UT with the Echelle spectrograph mounted on the Asiago 1.82m telescope (range 3650-7350 Ang, resolving power 20,000).
The Echelle spectrum for Jul 18.944 UT coincides with the initial photometric minimum; compared with the spectrum for July 17.102 UT from ATel #14793, it still shows the HeI and NII emission lines although at a much reduced intensity, while the FWHM of Balmer lines has sharpened from 1700 to 1400 km/s and the velocity of Balmer P-Cyg absorption reduced from -810 to -380 km/s (for Hbeta).
In the Echelle spectrum for July 28.942 UT, all HeI and NII features are gone, to be replaced by a forest of strong FeII lines (in particular multiples 27, 28, 37, 38, 42, 48, 49, 55, and 74) all flanked by deep P-Cyg absorptions as for the Balmer lines. This spectrum is a textbook example for a nova of the FeII-type. The typical radial velocity of P-Cyg absorptions is -230 km/s, and the FWHM of the emissions is around 240 km/s. To be resolved, such low velocities requires the high-resolution provided by an Echelle spectrograph.
It is not yet clear what is the reddening affecting the nova. The profile of interstellar CaII 3934, 3968 and NaI 5890, 5896, at heliocentric velocity -7.5 km/s, is the blend of at least two unresolved components. These atomic lines are saturated and cannot be used to derive the reddening except to place a lower limit of ~0.5 to E(B-V). The equivalent width of DIB 6614 is 0.23 Ang; combined with the calibration by Munari (2014, ASPC 490, 183) it returns E(B-V)=1.0 which agrees with value inferred from the IPHAS 3D map of Galactic extinction (Sales et al. 2014, MNRAS 443, 2907). On the other hand, comparing the intrinsic colors of novae at maximum from van den Bergh and Younger (1987 A&AS, 70, 125) with photometry in the table above, a value E(B-V)=0.5 is obtained, which is consistent with the prediction from the 3D maps of Galactic extinction by Lallement et al (2014, A&A, 561) and Green et al. (2019, ApJ 887, 93).
|
2021-07-30 04:47:00
|
optical,nova,transient
|
2021-07-30
|
04:47:00
| 3,176 |
[
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] | 14,814 |
14,817 |
Spectroscopy and photometry of transient ASASSN-21nv
|
U. Munari (INAF Padova), A. Maitan (ANS Collaboration)
|
The transient ASASSN-21nv has been discovered by ASAS-SN survey on Jul 28.56 at g=14.3 mag and reported as a possible nova to the Transient Name Server (TNS) by K.Z. Stanek and Z. Way (on behalf of the ASAS-SN team) where it received the designation AT 2021ufe.
We have obtained a photometric observation of ASASS-21nv on July 29.105 UT with ANS Collaboration telescope ID 2202. PSF-fitting photometry has been applied because the transient is located close to a field star, about 10arcsec away and quite red in color. We have measured B=14.807, V=14.366, R=14.031, I=13.749 for ASASS-21nv and B=18.00, V=16.44, R=15.238, I=14.261 for the field star.
A low resolution spectrum (range 3200-8000 Ang, dispersion 2.31 Ang/pix) of ASASSN-21nv has been recorded on July 29.896 UT with the Asiago 1.22m + B&C spectrograph. The spectrum is characterized by a smooth and hot continuum, with Halpha in moderate and narrow emission, and Hbeta and Hgamma as emission cores within a larger absorption. The spectrum suggests that ASASSN-21nv is a cataclysmic variable in outburst.
|
2021-07-30 06:08:00
|
optical,cataclysmic variable,nova,star,transient,variables
|
2021-07-30
|
06:08:00
| 1,069 |
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0.04498464614152908
] | 14,815 |
14,818 |
NICER follow up of the new X-ray transient Swift J1729.5-3223
|
A. Sanna (Univ. Cagliari), D. Altamirano (Univ. of Southampton), M. Ng (MIT), L. Burderi, A. Riggio (Univ. Cagliari), T. Di Salvo (Univ. Palermo)
|
Following the announcement of the new X-ray transient Swift J1729.5-3223 discovered by Swift (ATel #14791), we started observing the source with the Neutron star Interior Composition Explorer (NICER) starting from 2021 July 28 at 11:12 UT, for a total exposure of approximately 5 ksec.
The average source count rate measured by NICER was 4.2 cts/sec (0.5-10 keV). The 0.5-10 keV power spectrum does not present significant periodic or aperiodic signals in the frequency range 5E-3Hz - 2.5E+3 Hz.
The continuum X-ray spectrum extracted from the NICER data in the 0.5-10 keV energy range is well described (red. chi^2 1.10 for 108 d.o.f.) by an absorbed power-law. The absorption column density derived from the spectral fit is N_H = 2.14(4)E+22 cm^-2, while the power-law photon index is 1.52(3). The absorbed 0.5-10 keV source flux is 3.4(1)E-11 erg cm^-2 s^-1. There is no evidence of a spectral Fe line feature in the energy range 6.4-7 keV.
At the moment, the temporal and spectral properties of Swift J1729.5-3223 do not allow us to unambiguously identify the nature of the compact object in the X-ray binary system. ATCA radio observations performed closely with X-ray Swift observations placed the source at a position on the radio/X-ray plane consistent with it being either a black hole or neutron star X-ray binary (ATel #14815). Therefore, further X-ray, as well as multi-wavelength observations, are strongly encouraged.
NICER is a 0.2-12 keV X-ray telescope operating on the International Space Station. The NICER mission and portions of the NICER science team activities are funded by NASA.
|
2021-07-31 03:39:00
|
radio,x-ray,binary,black hole,neutron star,star,transient
|
2021-07-31
|
03:39:00
| 1,607 |
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] | 14,816 |
14,819 |
B2 1420+32 is in high optical and polarization state
|
S. S. Savchenko, M. I. Chazov, A. E. Nazarova, E. V. Shishkina, E. G. Larionova (St. Petersburg univ., Russia)
|
We perform optical photometric and polarimetric monitoring of a sample of gamma-bright blazars using 0.7-m AZT-8 telescope (Crimean Astrophysical Observatory), within the frames of GASP/WEBT project. We report that the blazar B21420+32 (z=0.681) is active in optical, reaching R=15.156 at JD=2459425.3107 with the degree of linear polarization of 33.5% (the previous night measurement was R=15.50 and polarization degree 27.5%). We plan to continue the monitoring of this object. The nightly updated light curve for this object can be found on our website.
|
2021-07-31 04:39:00
|
optical,blazar
|
2021-07-31
|
04:39:00
| 556 |
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] | 14,817 |
14,820 |
BL Lac reaches a new optical all-time maximum
|
Lukas Kunkel, Adrian Scherbantin, Karl Mannheim (all Universitaet Wuerzburg), Fiona Kaplan, Niels Bader, Erik Heidemann, Felix Hemrich, Ben Horst, Alexander Lessing, Jonas Ludwig, Felix Molz, David Reinhart, Korbinian Rosenlehner, Kilian Schoch, Remco Steineke, Lukas Waller, Nils Zottmann, Martin Feige, Christian Lorey (all Friedrich-Koenig-Gymnasium / Hans-Haffner-Sternwarte), Dominik Elsaesser (TU Dortmund)
|
Since BL Lac's major brightness outburst in the summer of 2020, we have observed a flare from this object roughly every three to three and a half months, each time reaching an even greater maximum brightness in the optical spectral range. The current outbreak began in early July 2021 (ATel #14751, ATel #14773) and has been observed in different wavelength bands (ATel #14774, ATel #14777, ATel #14782, ATel #14783). Tonight we measured a rapid increase in optical brightness (R-Band) from 11.433 ± 0.004 mag (21:30 UTC - JD 2459426.3956) to 11.315 ± 0.003 mag (22:12 UTC - JD 2459426.4252). Over the next hour and a half, the brightness then slowly increased (with fluctuations) to 11.271 ± 0.003 mag (23.50 UTC - JD 2459426.4930), which is a new all-time high state for this AGN, as far as our coverage is concerned. By dawn in Hettstadt, the brightness slowly decreased to 11.444 ± 0.008 mag (02:44 UTC - JD 2459426.6142). We are using Bessel filters and for the aperture photometry we are using the specifications of the GASP list of WEBT (https://www.oato.inaf.it/blazars/webt/gasp/fc/2200fc.html). We strongly encourage further observations of this record optical flare. These measurements are carried out as part of the long-term AGN monitoring program of the Naturwissenschaftliches Labor fuer Schueler am Friedrich-Koenig-Gymnasium (FKG), the Universitaet Wuerzburg, and TU Dortmund with the 0.5m CDK-astrograph at the school and university observatory Hans-Haffner-Sternwarte in D-97265 Hettstadt (Germany).
|
2021-07-31 15:18:00
|
optical,agn,blazar
|
2021-07-31
|
15:18:00
| 1,518 |
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] | 14,818 |
14,821 |
Beginning of a giant radio flare from Cygnus X-3
|
S. A. Trushkin, A. V. Shevchenko, N. A. Nizhelskij, P. G. (SAO RAS) Tsybulev
|
In the long-term multi-frequency monitoring of the Galactic microquasars with the RATAN-600 radio telescope we have detected a giant flare at 1.2-30 GHz from the microquasar Cyg X-3 (see ATel #13461, #13835). Almost a year after last bright event on 31 July 2021 (MJD 59425.883) we have measured fluxes 0.76, 4.30, 7.73, 7.62, 6.92, 4.43 and 2.86 Jy at 1.24, 2.3, 4.7, 8.2, 11.2, 22.3 and 30 GHz respectively (with errors are less 3-5%) while the binary was in a quenched state about 50 days before (see the figure below). We consider that Cyg X-3 is in the beginning of massive jet ejection that is usually characterized by two regimes: an optically thick one at frequencies lower 4 GHz and by an optically thin one at frequencies higher 5 GHz. The radio spectra during last days are given here . The Swift/BAT data (http://swift.gsfc.nasa.gov/results/transients/CygX-3) show the strong increase of hard X-ray flux at 15-50 keV around MJD 59422. Thus it is a case of a clear association of flaring events in the radio and X-ray bands, related with so-called the disk-jet coupling in the X-ray binary stars as a result of a jet production in the polar regions of accretion disk around a black hole. Again we have met the regular rule: a giant radio flare accurs just after transition from a hyper-soft X-ray state to a soft (later to a hard) state in Cyg X-3 (Koljonen et al., 2010). Following the VLBI mapping, mm-band, X-ray and Gamma-ray observations of Cyg X-3 could be very useful.
|
2021-07-31 20:52:00
|
radio,millimeter,x-ray,gamma ray,binary,black hole,star,transient
|
2021-07-31
|
20:52:00
| 1,486 |
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] | 14,819 |
14,822 |
Radio Flaring of the Quasar B2 1420+32
|
F. Eppel, M. Kadler, A. Gokus, J. HeÃdörfer, F. Rösch, J. Sinapius
|
We report radio flaring of the flat-spectrum radio quasar B2 1420+32 at high radio frequencies in the 14mm and 7mm bands observed as part of the TELAMON program. We have observed the source in the night of July 28, 2021 and measured flux densities of (1.059 ± 0.012) Jy and (1.26 ± 0.10) Jy at 14mm and 7mm, respectively, averaged over four frequencies within each band. This corresponds to an increase of ~300mJy at 14mm and ~500 mJy at 7mm within 33 days. The radio flaring seems to correlate with an ongoing optical flare of this source reported in ATel #14819.
|
2021-08-01 20:25:00
|
radio,optical,agn,blazar,quasar
|
2021-08-01
|
20:25:00
| 564 |
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] | 14,820 |
14,823 |
Spectroscopic classification of AT2021niy as a dwarf nova in outburst
|
Ann Isaacs (UMN), Patrick Kelly (UMN), Peter Garnavich (Notre Dame), Paul Smith (Steward Observatory, University of Arizona)
|
We report the spectral classification of transient AT2021niy. The transient was identified by ATLAS on 2021-05-24. Observations were made on UT 2021-06-06 with Steward Observatory's Bok telescope on Kitt Peak, Arizona. We obtained three exposures lasting 900 seconds each using the Boller & Chivens spectrograph. The slit width was 2.5 arcseconds and the spectral coverage ranged from 3700 to 8000 angstroms. The data were then reduced using PypeIt (Prochaska et al., 2020).
This object shows a continuum spectrum that peaks near 4200 Angstroms with Balmer lines close to zero redshift. The spectrum is consistent with that of a dwarf nova in outburst. We located a likely progenitor in SDSS consistent with a point source and that is brightest in the g band with a magnitude of 20.68. It is notably blue in color.
|
2021-08-01 22:54:00
|
optical,nova,transient
|
2021-08-01
|
22:54:00
| 815 |
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] | 14,821 |
14,824 |
[FeX] and [FeXI] coronal lines now present in Nova Her 2021
|
Ulisse Munari (INAF Padova)
|
Nova Her 2021 (= 1674 Her = TCP J18573095+1653396) has been discovered on 2021 June 12.537 UT by Seiji Ueda and spectroscopically classified as a nova by Munari et al. (ATel #14704). It has reached a very bright maximum (B=6.903, V=6.184, R=5.749, I=5.232 on June 12.862 UT according to ANS Collaboration monitoring) and this favored follow-up observations and detection at all wavelengths (ATel #14805, 14798, 14776, 14758, 14747, 14740, 14737, 14736, 14731, 14728, #14723, 14720, 14718, 14713, 14710, 14705, 14658, 14530).
Woodward et al. (ATel #14741) reported about initial appearance of infrared coronal emission lines in a spectrum of the nova they obtained with SpeX on June 24.4 UT, probably the detection at the earliest epoch (11.5 days) of any nova. Two weeks later, when Woodward et al. (ATel #14765) re-observed the nova again with SpeX on July 7.3 UT, the coronal lines became the dominant infrared spectral feature, second in intensity only to HeI 1.083 micron. Wagner et al. (ATel #14746) classified V1674 Her as a Neon Nova on a spectrum they obtained on June 30.4 UT, in which [NeV] 3427 was very bright and second in intensity only to Halpha. The presence of [FeX] 6375 was considered uncertain given the absence of [FeVII] 6087.
Coronal lines are now present also in optical spectra. The table below compares the integrated flux of representative emission lines (in erg/cm2/sec) on two spectra of Nova Her 2021 we have obtained with the Asiago 1.22m telescope. On July 10.91 Halpha was still stronger than [NeV] 3427, but this reversed by July 29.94. [FeXI] 7892 has clearly emerged in emission on the second epoch. Both the underlying continuum and all forbidden emission lines declined by the same 2.5 factor between the two spectra (cf. their EW in the table). Permitted lines have declined faster: 3.1 times for Balmer, and 4.0 times for HeI and HeII. The quickly retracing HeII 4686 is probably the main reason behind the decline in EW of the [NeIV]+HeII+NIII blend centered at 4690 Ang. All lines at both epochs remain very broad (FWHM=5500 km/s), with [NeV] and [NeIII] showing a mildly double-peaked profile and all other lines a rounded top.
|
2021-08-01 23:38:00
|
optical,nova
|
2021-08-01
|
23:38:00
| 2,172 |
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] | 14,822 |
14,825 |
Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
|
K. Taggart, C. D. Couch, S. Tinyanont, R. J. Foley (UCSC), W. Jacobson-Galan (UCB)
|
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by ZTF and ALeRCE (selected from the ZTF data stream). All observations were made on 2021 Aug 03 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure an Si II 6355 velocity of -13,200 km/s. (2) We detect a hot, blue continuum from a likely core-collapse SN. (3) We detect a hot, blue continuum from a likely core-collapse SN.
|
2021-08-04 02:34:00
|
optical,supernovae,transient
|
2021-08-04
|
02:34:00
| 696 |
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] | 14,823 |
14,826 |
Detection of flaring very-high-energy gamma-ray emission from BL Lacertae with the MAGIC telescopes
|
Oscar Blanch (Institut de Fisica d'Altes Energies, IFAE-BIST), Giacomo Bonnoli (IAA-CSIC - Granada), Hiromu Iwasaki, Jelena Striskovic, and Ryo Imazawa, on behalf of the MAGIC collaboration
|
The MAGIC telescopes have observed an increase in the very-high-energy (VHE; >100 GeV) gamma-ray flux from BL Lacertae. The preliminary analysis of the MAGIC data taken on 2021/08/02 (MJD 59428.9) indicates a flux corresponding to about 1.3C.U. at E> 100GeV, which is about one order of magnitude higher than typical non-flaring flux values. BL Lacertae is very variable in the VHE gamma-ray range, and shows VHE gamma-ray fluxes as high as 3 C.U. (ATel #14032). BL Lacertae is a blazar located at redshift 0.0686, and it has shown several bright VHE gamma-ray flares in the past (http://tevcat.uchicago.edu/?mode=1&showsrc=118). The MAGIC observations were triggered by the detection of the all-time highest flux at optical wavelengths (ATel #14820). BL Lac is undergoing a high state in gamma rays (Fermi-LAT: https://fermi.gsfc.nasa.gov/FTP/glast/data/lat/catalogs/asp/current/lightcurves/BLLac_86400_1yr.png) and in X-rays as well (Swift: https://www.swift.psu.edu/monitoring/source.php?source=BLLacertae). The current outbreak began in early July 2021 (ATel #14751, ATel #14773) and has been reported in many occasions (ATel #14774, ATel #14777, ATel #14782, ATel #14783). MAGIC observations on BL Lac will continue during the next days and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are O.Blanch ([email protected]) and Giacomo Bonnoli ([email protected]) The preliminary analysis has been performed by Hiromu Iwasaki ([email protected]) and Jelena Striskovic ([email protected]). MAGIC is a system of two 17m-diameter Imaging Atmospheric Cherenkov Telescopes located at the Canary island of La Palma, Spain, and designed to perform gamma-ray astronomy in the energy range from 50 GeV to greater than 50 TeV.
|
2021-08-04 19:13:00
|
optical,x-ray,gamma ray,tev,vhe,agn,blazar,variables
|
2021-08-04
|
19:13:00
| 1,787 |
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0.01852491684257984,
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0.062369003891944885,
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-0.06374231725931168,
-0.00931120291352272
] | 14,824 |
14,827 |
Spectroscopic Classification of AT2021uhz and AT2021uum
|
Kevin McKinnon, Stephanie Figuereo, Rafael Nunez, Puragra Guhathakurta (UCSC), Monika Soraisam (NCSA/UIUC), Chien-Hsiu Lee (NOIR Lab)
|
We report the spectroscopic observations of the following transients from the SALVATION project (ATel #13952). They were flagged from the ZTF public alert stream by the ANTARES alert-broker. The spectra were obtained on 2021 August 4 UT with the Kast double spectrograph on the Shane 3-m telescope at Lick Observatory.
|
2021-08-05 11:12:00
|
optical,cataclysmic variable,supernovae,transient,variables
|
2021-08-05
|
11:12:00
| 318 |
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] | 14,825 |
14,828 |
uGMRT radio non-detection of the TDE AT2020zso
|
Rupak Roy (IUCAA), A. J. Nayana (UAE University), Poonam Chandra (NCRA-TIFR)
|
Alexander et al. (ATEL #14337, AstroNote 2021-24) reported the discovery of the radio counterpart of the Tidal Disruption Event AT2020zso with the Karl G. Jansky Very Large Array (VLA) at 15 GHz, roughly 40 days after the disruption. We carried out radio observations of AT2020zso with the upgraded Giant Metrewave Radio Telescope in band 4 (550-900 MHz) on 2021 May 30, and in band 5 (1050-1450 MHz) on 2021 June 08. We did not detect radio emission at the low-frequencies and the 3-sigma upper limits at the TDE position (https://www.wis-tns.org/object/2020zso) are 46.59 microJy and 51.15 microJy at the central frequencies of 0.65 and 1.26 GHz, respectively. It indicates that the radio emission at these frequencies is probably absorbed at the present epoch and likely to reveal itself later. We thank the staff of the uGMRT who made these observations possible. uGMRT is run by the National Centre for Radio Astrophysics of the Tata Institute of Fundamental Research.
|
2021-08-05 21:26:00
|
radio,tidal disruption event
|
2021-08-05
|
21:26:00
| 973 |
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] | 14,826 |
14,829 |
Discovery of 9 ASAS-SN Supernova Candidates
|
J. Brimacombe (Coral Towers Observatory), P. Vallely, K. Z. Stanek, C. S. Kochanek, C. Christy, M. Smith, S. Bose, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus), G. Bock (Runaway Bay Observatory, Australia), P. Pearl (The Gap Observatory, BOSS)
|
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, the quadruple 14-cm "Leavitt" telescope in Fort Davis, Texas, the quadruple 14-cm "Payne-Gaposchkin" telescope in Sutherland, South Africa, and the quadruple 14-cm "Cassius" and "Paczynski" telescopes in Cerro Tololo, Chile, we discovered several new transient sources. Properties of the supernovae, as well as associated finding charts showing the archival imaging (left) and the follow-up confirmation image (right) are included in the table below:
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-21xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-21xx (AT 2021xyz) to preserve, rather than anonymize, the origin of the transient.
We would like to thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.
|
2021-08-06 08:15:00
|
optical,supernovae,transient
|
2021-08-06
|
08:15:00
| 1,604 |
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-0.021040529012680054,
-0.04513082653284073,
-0.013017475605010986,
-0.03622204437851906,
0.005768710747361183,
0.0518413707613945,
0.03996305540204048,
-0.11251553148031235,
-0.014085276983678341,
0.039002642035484314,
0.05873800069093704,
-0.056173037737607956,
-0.11597538739442825,
-0.034817252308130264
] | 14,827 |
14,830 |
Spectroscopic Classification of AT2021urs and AT2021ubw
|
Stephanie Figuereo, Kevin McKinnon, Rafael Nunez, Puragra Guhathakurta (UCSC), Monika Soraisam (NCSA/UIUC), Chien-Hsiu Lee (NOIR Lab)
|
We report the spectroscopic observations of the following transients from the SALVATION project (ATel #13952). They were flagged from the ZTF public alert stream by the ANTARES alert-broker. The spectra were obtained on 2021 August 5 UT with the Kast double spectrograph on the Shane 3-m telescope at Lick Observatory.
|
2021-08-06 12:02:00
|
optical,supernovae,transient
|
2021-08-06
|
12:02:00
| 318 |
[
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] | 14,828 |
14,831 |
MASTER discovery 2 PSN
|
P. Balanutsa, V. Lipunov, V. Kornilov, E. Gorbovskoy, I. Gorbunov, O. Gress, N. Tyurina, A. Kuznetsov, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, V. Shumkov, A. Chasovnikov, E. Minkina, V. Topolev, D. Kuvshinov, K. Zhirkov, T. Pogrosheva, V. Shumkov (Lomonosov Moscow State University), D. Buckley (SAAO), R. Podesta, F. Podesta, C. Lopez, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), N. Budnev, O. Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
|
MASTER OT J202959.23-495002.5 PSN in PGC472721 discovery in field FERMI
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )discovered OT source in PGC472721 at (RA, Dec) = 20h 29m 59.23s -49d 50m 02.5s on 2021-08-04.91131 UT. The OT unfiltered magnitude in unfiltered filter is 18.1m (mlim=20.3). The OT is seen in 4 images. There is no minor planet at this place. We have reference image on 2015-04-13.08883 UT with unfiltered mlim= 20.7m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/202959.23-495002.5_1.png
MASTER OT J142206.43-265125.0 PSN discovery
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )discovered OT (PSN) source at (RA, Dec) = 14h 22m 06.43s -26d 51m 25.0s on 2021-08-04.10326 UT. The OT magnitude in unfiltered filter is 18.1m (mlim=19.8). The OT is seen in 2 images. There is no minor planet at this place. We have reference image on 2021-05-18.17096 UT with 'BLANK' filter 19.8m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/142206.43-265125.0.png
|
2021-08-06 19:58:00
|
agn,nova,planet,supernovae,transient,variables
|
2021-08-06
|
19:58:00
| 1,188 |
[
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] | 14,829 |
14,832 |
Optical spectroscopic follow up of the classical nova V606 Vul (TCP J20210770+2914093)
|
E. Aydi, K. V. Sokolovksy, J. Strader, L. Chomiuk, A. Kawash (MSU), Kwan-Lok Li (NCKU), N. Ikonnikova, K. E. Atapin, A. A. Belinski, M. A. Burlak, A. V. Dodin, N. A. Maslennikova, K. A. Postnov, S. A. Potanin, B. S. Safonov, N. I. Shatsky, and A. M. Tatarnikov (SAI Moscow State University)
|
We report on spectroscopic follow up of the classical nova V606 Vul (TCP J20210770+2914093), which was discovered by Seiichiro Kiyota (Kamagaya, Japan) on 2021-07-16.56 UT, and classified spectroscopically as a classical nova by Munari et al. (ATel #14793).
We obtained several low- and medium-resolution spectra on 2021-07-29/30 using the Goodman spectrograph (Clemens et al. 2004, SPIE, 5492, 331) on the 4.1-m SOAR telescope (Cerro Pachon, Chile) and the 2.5-m SAI Moscow State University telescope (Kislovodsk, Russia). We also obtained low resolution spectra on 2021-08-05 using the 2.5-m SAI telescope. The spectra taken on July 29 and 30 show P Cygni profiles of Balmer, Fe II, and O I, with absorption troughs at blueshifted velocities of around 300 km/s. The spectra are consistent with that of a classical nova before optical peak. The spectra obtained on August 05, almost a week later, show the same lines but with multiple spectral components: P Cygni profiles with absorption troughs at blueshifted velocities of around 350 km/s superimposed on top of broad emissions with a FWZI of around 3200 km/s. These features are that of a classical nova after optical peak. This is consistent with the AAVSO optical light curve, which peaked at around 2021-08-02. The spectral evolution of nova V606 Vul is consistent with the paradigm of early spectral evolution of novae presented by Aydi et al. (2020; ApJ, 905, 62), which suggests the presence of two physically distinct outflows, a slow and fast one, during the early weeks of a nova event.
This ATel is based on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministerio da Ciencia, Tecnologia, Inovacoes e Comunicacoes do Brasil (MCTIC/LNA), the U.S. National Science Foundation's National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU).
|
2021-08-07 03:45:00
|
optical,binary,cataclysmic variable,nova,star,transient,variables
|
2021-08-07
|
03:45:00
| 1,946 |
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0.1234387457370758,
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-0.057356998324394226,
0.016989154741168022
] | 14,830 |
14,833 |
Spectroscopic Classifications of Optical Transients with Keck I + LRIS
|
K. Davis, S. Tinyanont, M. R. Siebert, K. Taggart, R. J. Foley (UCSC), C. Angus (DARK)
|
We report the following classifications from spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2021 Aug 6 UT. The targets were supplied by AMPEL and ALeRCE (selected from the ZTF data stream), ATLAS, ZTF, and YSE. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a Si II velocity of -11,000 km/s. (2) We measure a Si II velocity of -11,700 km/s. (3) We measure a Si II velocity of -12,100 km/s. (4) We measure a Si II velocity of -14,000 km/s.
|
2021-08-07 12:42:00
|
optical,supernovae,transient
|
2021-08-07
|
12:42:00
| 684 |
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0.04795197769999504
] | 14,831 |
14,834 |
Fermi-LAT Gamma-ray Detection of the Recurrent Nova RS Oph
|
C. C. Cheung (NRL), S. Ciprini (ASI Space Science Data Center, Roma, & INFN Roma Tor Vergata, Italy), T. J. Johnson (GMU, resident at NRL), on behalf of the Fermi Large Area Telescope Collaboration
|
The Large Area Telescope (LAT), one of two instruments on the Fermi Gamma-ray Space Telescope, has independently detected a transient gamma-ray source positionally consistent with the newly detected optical outburst of the recurrent nova RS Oph on 2021 Aug 8, 22:20 UT reported by K. Geary (vsnet-alert 26131, http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/26131 ), with an estimated visual magnitude of 5.0. Its previous outburst was in 2006, with an average recurrence time of ~15 years over eight recorded historical outbursts (Schaefer 2010, ApJS, 187, 275).
Preliminary analysis indicates its first detection (with ~6-sigma signficance) in the last 6-hr interval (18:00-24:00 UT) of 2021 Aug 8, coinciding with the optical discovery, with a (E >100 MeV) flux of (2.4 +/- 0.8) x 10^-6 photons cm^-2 s^-1 and photon index of 2.3 +/- 0.3 (statistical uncertainties only). The gamma-ray onset coincident with the time of the optical discovery is similar to the case of the Fermi-LAT detection of a similar symbiotic-like recurrent nova V407 Cyg 2010 (Abdo et al. 2010 Sci 329, 817; ATel #2487).
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the ongoing activity of this source, we encourage multi-wavelength observations. For this source the Fermi LAT contact is C.C. Cheung ([email protected]).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
|
2021-08-09 13:05:00
|
optical,gamma ray,nova,transient
|
2021-08-09
|
13:05:00
| 1,689 |
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] | 14,832 |
14,835 |
Detection of a possibly orbital period of the classical Nova V1674 Her
|
Sergey Shugarov, Marina Afonina
|
Photometric observations of V1674 Her (ATel #14704) were carried out during the outburst decline From 40 to 55 days after the maximum of the outburst (JD 2459417-434). We found the optical BVRcIc modulation with a period of 0.15290(3) days. The profile of the light curve has amplitude close to 0.12 mag and shows two unequal minima separated by half a period. We assume that this period may be caused by orbital motion. The light curve folded with ephemeris JD hel min = 2459426.327+0.1529*E is presented in Figure.
|
2021-08-09 20:14:00
|
optical,nova
|
2021-08-09
|
20:14:00
| 516 |
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-0.003947006072849035,
-0.11592429876327515,
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-0.12532395124435425,
0.01310952752828598
] | 14,833 |
14,836 |
Further monitoring of FRB 20201124A with Swift
|
B. O'Connor (George Washington University), L. Piro (INAF/IAPS), S. Lotti (INAF/IAPS), R. Ricci (INAF/IRA), G. Bruni (INAF/IAPS) , B. Zhang (University of Nevada), F. Panessa (INAF/IAPS)
|
We observed the location of FRB 20201124A with the Neil Gehrels Swift Observatory under the Swift Guest Investigator program (Program: 1619112, PI: Piro) on July 28, 2021 starting at 10:54:00 UT for 8.6 ks and on August 7 starting at 01:49:00 UT and ending at 16:37:01 UT for a total of 6.3 ks. These observations were carried out with the X-ray Telescope (XRT) in Photon Counting (PC) mode. No source was identified at the FRB position (ATel #14603) in either observation. We derive a 3-sigma upper limit of <1.3e-3 cts/s on July 28, which we convert to an unabsorbed flux <1.0e-13 erg/cm^2/s using an absorbed power-law model with Photon index gamma=2 and a Galactic hydrogen column density nH=4.5e21 cm^-2 (Willingale et al. 2013). The 3-sigma upper limit on August 7 is <1.7e-3 cts/s yielding an unabsorbed flux <1.3e-13 erg/cm^2/s by adopting the same power-law model.
We also report on simultaneous observations with the Ultraviolet-Optical Telescope (UVOT) on July 28 in the u filter for a total exposure of 8.4 ks, and on August 7 in the uvw2 filter for 2 ks and in the u filter for 3.8 ks. The upper limit at the FRB position on July 28 is u>22.6 AB mag, and on August 7 is uvw2>22.5 and u>22.3 AB mag.
We thank the Swift team for their assistance in scheduling these observations.
|
2021-08-09 20:58:00
|
radio,optical,ultra-violet,x-ray,fast radio burst
|
2021-08-09
|
20:58:00
| 1,293 |
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] | 14,834 |
14,837 |
Ongoing brightening of the eclipsing symbiotic star AR Pav
|
J. Merc (UPJS in Kosice, Charles University), R. Galis (UPJS in Kosice), O. Garde, L. Mulato, P. Le Du, S. Charbonnel, T. Petit (2SPOT team)
|
AR Pav is an eclipsing symbiotic star with an orbital period of around 605 days (e.g., Sekeráš et al., 2019, CAOSP, 49, 19, and references therein). Its photometric activity has been monitored since 1889 (see Fig. 1 in Skopal et al., 2001, IBVS, 5195 and Fig. 23 in Sekeráš et al., 2019, CAOSP, 49, 19). Its long-term photographic/B-band light curve is characterized by ~2 mag eclipses and an out-of-eclipse variability between 10 – 12 mag. Several brightenings of the system have been detected in past, with the most prominent outbursts observed in 1900 and 1935, when the star reached ~9 mag. In the recent decade, the star experienced only smaller brightenings in 2013 and 2014 during which the star was always fainter than 10.5 mag.
The photometric observations of AR Pav by the ASAS-SN survey (Shappee et al., 2014, ApJ 788, 48; Kochanek et al., 2017, PASP, 129, 104502) revealed an ongoing brightening by about 1.2 mag (with a peak brightness around 10 mag in the g filter). A slight rise towards the maximum started in April 2021 and accelerated in May 2021, reaching the maximal brightness at the beginning of June. Since then, according to the recent ASAS-SN light curve of AR Pav, brightness seems to fluctuate in a pattern similar to superhumps observed in cataclysmic variables (although some additional unexplained scatter seems to be present in the light curve). Such behavior is not detected during the rise to the maximum nor during the previous orbital cycles observed by ASAS-SN.
We obtained an optical spectrum of AR Pav on August 9, 2021 (JD 2 459 435.7) using an Alpy600 spectrograph mounted at a remotely controlled 35-cm Ritchey-Chretien telescope located in Chile. The spectrum shows a weak continuum of an M giant in addition to strong emission lines of H I, He I, [O III], relatively faint He II, and several emission lines of Fe II. Emission lines with a higher ionization potential (e.g., [Fe VII]) are not detected in our spectrum. The overall appearance of the spectrum is consistent with a Z And-type symbiotic star in an outburst.
Further multi-band photometric and spectroscopic observations are encouraged.
|
2021-08-09 21:13:00
|
infra-red,optical,binary,cataclysmic variable,star,transient,variables
|
2021-08-09
|
21:13:00
| 2,143 |
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] | 14,835 |
14,838 |
Spectroscopic Follow-up Observation of the 2021 outburst of the recurrent nova RS Ophiuchi
|
Kenta Taguchi, Toshiya Ueta, Keisuke Isogai (Kyoto University)
|
We report our low-resolution spectra of RS Ophiuchi taken from 2021-08-09.443 UT to 2021-08-09.446 UT using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8-m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University.
As had been predicted in #13810, the first outburst since 2006 of the recurrent nova RS Ophiuchi has just occurred. It was discovered and reported to vsnet-alert by Keith Geary ([vsnet-alert 26131]). Also, the Large Area Telescope (LAT) on the Fermi Gamma-ray space telescope discovered it independently (#14834).
Our spectrum has Fe II, O I, and prominent Balmer lines. All of them listed here have a P Cygni profile. The velocity of the Hβ emission line is ∼ 2600 km/s. The profile and velocity indicate that this outburst is indeed a nova eruption, as is expected.
|
2021-08-09 23:05:00
|
optical,gamma ray,cataclysmic variable,nova,transient,variables
|
2021-08-09
|
23:05:00
| 860 |
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] | 14,836 |
14,839 |
AGILE detection of enhanced gamma-ray activity from the blazar BL Lac
|
G. Piano (INAF/IAPS), C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), S. Vercellone (INAF/OA-Brera), I. Donnarumma (ASI), A. Bulgarelli, V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), F. Verrecchia, F. Lucarelli (SSDC and INAF/OAR), M. Cardillo, A. Ursi, C. Casentini (INAF/IAPS), F. Gianotti, M. Trifoglio (INAF/OAS-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, L. Foffano, I. Lapshov, E. Menegoni, L. Pacciani, P. Soffitta, V. Vittorini (INAF/IAPS), F. Lazzarotto (INAF/OAPD), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti (INAF/OAS-Bo), M. Marisaldi (University of Bergen), A. Pellizzoni, M. Pilia, A. Trois (INAF/OA-Cagliari), G. Barbiellini (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), E. Vallazza (INFN Milano Bicocca), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), L. A. Antonelli (INAF/OAR), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI)
|
AGILE is detecting enhanced gamma-ray activity above 100 MeV from the blazar BL Lacertae. Integrating from 2021-08-06 UT 18:00:00 to 2021-08-08 UT 18:00:00 (MJD: 59432.75 - 59434.75), a preliminary multi-source maximum likelihood analysis yields a detection significance greater than 7 sigma and a flux F(>100 MeV) = (6 +/- 1) x 10^-6 photons/cm^2/s.
BL Lac entered in a multiwavelength outburst at the beginning of July 2021 (ATel #14751, ATel #14773, ATel #14774, ATel #14777, ATel #14782, ATel #14783, ATel #14820, ATel #14826). This detection represents the peak gamma-ray emission of the current outburst, as detected by AGILE so far.
The AGILE-GRID detection was obtained while AGILE is observing in spinning mode, surveying a large fraction of the sky each day. The source can be monitored with the public mobile application "AGILEScience" developed by the AGILE Team, available for both Android and iOS devices.
Multifrequency observations of BL Lac are strongly encouraged.
|
2021-08-09 23:27:00
|
gamma ray,agn,black hole,blazar,quasar
|
2021-08-09
|
23:27:00
| 985 |
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] | 14,837 |
14,840 |
Echelle spectroscopy of RS Oph at day +0.87 from optical discovery
|
U. Munari (INAF Padova) and P. Valisa (ANS Collaboration)
|
Spectroscopic observations of the symbiotic star and recurrent nova RS Oph have been obtained with Varese 0.84m + Echelle and Asiago 1.22 + BC on 2021 July 9.80 UT, about 0.87 days past the discovery of the 2021 outburst on July 8.93 UT by K. Geary (VSNET alert N.26131), and soon detected in gamma-rays by Fermi-LAT (Cheung et al. ATel #14834). Our Echelle spectrum covers the range 4250-8900 Ang at 20,000 resolving power, the BC spectrum extends from 3200 to 7800 Ang, at 2.3 Ang/pix dispersion, and are rather different from the spectrum described in ATel #14836.
The spectrum of RS Oph is characterized by very broad emissions lines with superimposed very narrow components. Overall there is an excellent match with a similar spectrum we obtained on RS Oph less than 1 day into the 2006 eruption.
The broad emission lines resemble He/N novae, with strong Balmer and HeI (4922, 5016, 5876, 6678, 7065) lines. NII (4651, 5176) is present too. The broad component is characterized by a FWHM=2900 km/s and FWZI=6400 km/s and the presence of deep P-Cyg absorption blue-shifted by -3700 and -2700 km/s. The narrow component is best visible in the Balmer, HeI, and FeII #42 lines, and has a FWHM=39 km/s. A narrow and sharp absorption (FWHM=35 km/s) is located 60 km/s to the blue of the narrow emission component, and could originate in the neutral, external part of the red giant wind.
|
2021-08-10 03:45:00
|
optical,gamma ray,cataclysmic variable,nova,star,variables
|
2021-08-10
|
03:45:00
| 1,387 |
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] | 14,838 |
14,841 |
Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
|
K. Taggart, J. L. Johnson, R. J. Foley (UCSC)
|
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by YSE and ALeRCE (selected from the ZTF data stream). All observations were made on 2021 Aug 08 UT. Classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) Broad hydrogen features have emerged, so we now classify this as a SN II. We measure an H-alpha velocity of -8,900 km/s (2) Broad hydrogen features have emerged, so we now classify this as a SN II. We measure an H-alpha velocity of -12,000 km/s
|
2021-08-10 06:36:00
|
optical,supernovae,transient
|
2021-08-10
|
06:36:00
| 754 |
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] | 14,839 |
14,842 |
Independent Discovery of a Probable Nova in M31
|
A. Valcheva (Sofia University, Bulgaria), A. Kostov (IA and NAO, BAS, Bulgaria), P. Nedialkov (Sofia University, Bulgaria)
|
We report the independent discovery of a probable nova in M31 on 5x300 sec co-added R-band CCD images taken on 2021 Aug 8.951 UT with the 50/70 Schmidt telescope at Rozhen NAO Bulgaria. We were able to confirm the transient on 5x300 sec co-added R-band images taken on 2021 Aug 9.968 UT with the same instrumentation and we detected an increase in its brightness.
The object was first announced on Aug 9.033 UT by Conjat and designated as AT2021vgi. We found the object at a position RA(J2000)=00h42m39s.58 and DEC(J2000)=+41o09'03".5, which is 641.1" west and 2476.1" south of the center of M31 (see the discovery image here). The following R-magnitudes are obtained:
Additional BV photometry of the object is also available: 2021 Aug 8.977, B=19.5 ± 0.1 mag 2021 Aug 8.966, V=19.4 ± 0.1 mag.
We found that the transient is located at a distance of 0.''45 from M31N 2009-11b (Shafter et al., 2011, ApJ, 734, 12).
|
2021-08-10 17:54:00
|
optical,nova,transient
|
2021-08-10
|
17:54:00
| 916 |
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] | 14,840 |
14,843 |
Three 6-Magnitude Brightenings of the Candidate Dwarf Nova / Polar AT2018bby / ZTF20aammhxq / ATLAS18nuj
|
Marco C. Lam (TAU), Eamonn Harvey (LJMU), Megan Newsome (UCSB/Las Cumbres), Yael Dgany (TAU), Matthew Green (TAU), Iair Arcavi (TAU), Paul Ross Mcwhirter (LJMU)
|
We report a candidate dwarf nova/polar/intermediate polar system (under the transient designations: AT2018bby, ZTF20aammhxq, and ATLAS18nuj) with three detected outbursts at an amplitude of ~6 magnitudes. Low-state durations are ~600 days. The object was reported as a candidate hot white dwarf in Bianchi et al. (2011) with Galex FUV=22.56 and NUV=22.95, and SDSS u=22.53, g=22.98, r=22.88, i=21.85, and z=22.83.
The first outburst was reported as supernova candidate ATLAS18nuj, reaching a maximum brightness of o=17.33 at UT 2018-04-26 11:39:50. The second and third outbursts were observed by ZTF reaching r=16.955 at UT 2020-02-09 12:08:54 and r=17.391 at UT 2021-08-04 05:29:02 at maximum. It has not been studied for variability in its low state.
We obtained a low-resolution spectrum with the FLOYDS spectrograph mounted on the Las Cumbres 2-meter Faulkes Telescope North on Haleakala, Hawaii, at UT 2021-08-07 06:22:38. The spectrum shows weak H-alpha, some He emission lines, and from H-beta to H-zeta, there are either emission lines on top of the absorption profiles, or Zeeman splitting features, suggesting a polar or intermediate polar system. H-alpha is seen weakly in emission. The spectrum is publicly available on the Transient Name Server. The emission is expected to be mainly from the accretion disk and white dwarf, as it is not typical of a black body.
The spectrum also shows several lines in emission, possibly associated with Fe I and He I, whereas He II at 4686A is not observed. The spectrum resembles the outburst spectra of U Gem, AR And and RZ LMi. Similarly to the candidate presented here, AR And lacks He II 4686A, but has He I in emission and is of the SS Cygni type dwarf nova subcategory.
Follow-up observations are encouraged at other wavelengths, especially radio and X-ray. High-resolution spectroscopy in the optical blue regime and polarimetric measurements are also encouraged. Photometry and spectroscopy of the object in its low-state are recommended in order to classify the system within the dwarf nova population.
|
2021-08-10 19:46:00
|
radio,optical,x-ray,cataclysmic variable,nova,supernovae,transient,variables
|
2021-08-10
|
19:46:00
| 2,066 |
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] | 14,841 |
14,844 |
Detection of VHE gamma-ray emission from the recurrent nova RS Ophiuchi with H.E.S.S.
|
Stefan J. Wagner, for the H. E.S. S. collaboration
|
The H.E.S.S. array of imaging atmospheric Cherenkov telescopes was used to carry out observations of the recurrent nova RS Ophiuchi currently in outburst and detected with Fermi/LAT (Cheung et al, ATel #14834). RS Ophiuchi is a high-mass WD/red giant binary with an orbital period of 455d that undergoes an outburst approximately every 15-20 years, with the previous one occurring in February 2006. The current outburst is associated with a high-velocity outflow (Taguchi et al., ATel #14838, Munari et al., ATel #14840).// H.E.S.S. Observations started on August 9 at 18:17 UTC , lasted until 22:41 UTC and were taken under good conditions. A preliminary onsite analysis of the obtained data shows a >6 sigma very-high-energy gamma-ray excess compatible with the direction of RS Ophiuchi. Further H.E.S.S. observations are planned. We strongly encourage follow-up at all wavelengths.// H.E.S.S. is an array of five imaging atmospheric Cherenkov telescopes for the detection of very-high-energy gamma-ray sources and is located in the Khomas Highlands in Namibia. It was constructed and is operated by researchers from Armenia, Australia, Austria, France, Germany, Ireland, Japan, the Netherlands, Poland, South Africa, Sweden, UK, and the host country, Namibia. For more details see https://www.mpi-hd.mpg.de/hfm/HESS/
|
2021-08-11 02:34:00
|
gamma ray,tev,vhe,binary,nova
|
2021-08-11
|
02:34:00
| 1,319 |
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] | 14,842 |
14,845 |
Further Fermi-LAT Observations of the Recurrent Nova RS Oph -- Gamma-ray brightening and observed onset
|
C. C. Cheung (NRL), T. J. Johnson (GMU, resident at NRL), I. Mereu (INFN Perugia), S. Ciprini (ASI Space Science Data Center, Roma, & INFN Roma Tor Vergata), P. Jean (IRAP, Toulouse), on behalf of the Fermi Large Area Telescope Collaboration
|
In ATel #14834, we reported the initial Fermi Large Area Telescope (LAT) gamma-ray detection of RS Oph with a (E >100 MeV) flux of (2.4 +/- 0.8) x 10^-6 photons cm^-2 s^-1 (photon index of 2.3 +/- 0.3) using data in the time interval from 2021 Aug 8, 18:00-24:00 UT (statistical uncertainties only). Preliminary analysis of data from 2021 Aug 9, 00:00 to Aug 10, 01:44 UT in ~6-hr bins shows a steady brightening of the source with peak E > 100 MeV fluxes of (5.5 +/- 0.8) x 10^-6 photons cm^-2 s^-1 and (5.7 +/- 0.8) x 10^-6 photons cm^-2 s^-1 in the last two time bins (Aug 9, 12:00-18:00 and Aug 9, 18:00 - Aug 10, 01:44, respectively) with a hard spectrum (single power-law photon index of 1.9 +/- 0.1 in both bins) and a detection of a high-energy photon with energy E = 12.9 GeV on Aug 9, 21:51:19.9. The VHE detection reported by H.E.S.S. (data from Aug 9, 18:17-22:41 UT; ATel #14844) lies within our last time bin and covers the time of the 12.9 GeV photon detection. The thus-far LAT-observed peak fluxes in RS Oph are 4x greater than the observed 1-day peak in V407 Cyg (Ackermann et al. 2014, Sci, 345, 554; ATel #2487).
Revisiting the analysis of the earlier Aug 8 data reported in ATel #14834 on shorter timescales indicates that the first significant gamma-ray detection (5.6-sigma signficance) lies in the interval spanning Aug 8, 20:00-21:00 (Aug 8.83-8.88) with a (E >100 MeV) flux of (2.1 +/- 0.7) x 10^-6 photons cm^-2 s^-1 (photon index fixed to 2.2). In the preceding time interval with LAT exposure at the nova position (due to Fermi's all-sky observing profile), Aug 8, 16:30-18:00 (Aug 8.69-8.75), the source was not significantly detected (1.6-sigma significance) with a 95% confidence flux upper limit of 1.1 x 10^-6 photons cm^-2 s^-1 (photon index fixed to 2.2). This time range of the first gamma-ray detection is slightly earlier than the epochs of the independent optical nova detections at ~5.0 mag reported in AAVSO Alert Notice 752 (see also, CBAT #5013) on Aug 08.91319 (A. Amorim), Aug 08.92014 (E. Muyllaert), and Aug 08.93056 (K. Geary).
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the ongoing activity of this source, we encourage multi-wavelength observations. For this source the Fermi LAT contact is C.C. Cheung ([email protected]).
The Fermi LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
|
2021-08-11 04:05:00
|
optical,gamma ray,vhe,nova
|
2021-08-11
|
04:05:00
| 2,656 |
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] | 14,843 |
14,846 |
MAXI/GSC detection of a new outburst of the recurrent nova RS Oph
|
M. Shidatsu (Ehime U.), H. Negoro (Nihon U.), T. Mihara (RIKEN), M. Nakajima, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, W. Iwakiri, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), N. Kawai, M. Niwano, R. Hosokawa (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC)
|
The MAXI/GSC nova alert system detected an X-ray source consistent with the recurrent nova RS Oph at 2021 August 10th UT 18:28 (MJD 59436.769). The triggered position was (R.A., Dec) = (267.403 deg, -6.805 deg) = (17 49 36, -06 48 17) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.24 deg and 0.22 deg, respectively. The roll angle of long axis from the north direction is 141.0 deg counterclockwise. It is likely that MAXI detected the new outburst of RS Oph, following the recent optical and gamma-ray detections (VSNET alert N.26131, ATels #14834, #14838, #14840, #14844, #14855). The MAXI/GSC light curve suggests that the X-ray brightening started around MJD 59435.5, which is later than the onset of the optical outburst. The latest 1-day averaged intensity was 36 +/- 1 mCrab (4-10 keV) on MJD 59436. The flux is rising at MJD 59437.0. The source was outside MAXI's field of view from MJD 59434.45 - MJD 59435.03, in which there were the optical onset and the Fermi/LAT detection of gamma-ray. Before this period the source was not detected significantly. Follow-up observations are encouraged.
|
2021-08-11 16:33:00
|
optical,x-ray,gamma ray,nova
|
2021-08-11
|
16:33:00
| 1,145 |
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] | 14,844 |
14,847 |
J0423-0120 (PKS 0420-014) : The third stage of mm/sub-mm flare
|
Seiji Kameno, Paulo Cortes, Edward Fomalont, Ruediger Kneissl, Antonio Hales, Celia Verdugo, Matias Radiszcz, Kurt Plarre, Cristian Lopez, Satoko Takahashi, Jose Fernandez, Jorge Garcia, Charles Hull, Pei-Ying Hsieh, Hugo Messias, David Rebolledo, Gabriel Marinello, Enrique Macias, Juan Cortes, Sergio Martin, Stuartt Corder (Joint ALMA Observatory), Claudia Agliozzo, Marie-Lou Gendron-Marsolais, Alvaro Ribas, Alejandro Santamaria, Chentao Yang, Eric Villard (European Southern Observatory), Brenda Matthews, Gerald Schieven (National Research Council Canada)
|
The Atacama Large Millimeter/submillimeter Array (ALMA) has detected a radio flare of the quasar J0423-0120 (PKS 0420-014) at 97.5, 233, and 343.5 GHz. The total flux densities have started to increase since 2017 and reached September 2018 the first peak at 4.2 Jy, 2.8 Jy, and 2.6 Jy at 97.5, 233, and 343.5 GHz, respectively. After two years of plateau phase, the second flare must have arisen during the array shutdown between March 2020 and January 2021. The flux densities ascended to 5.2 Jy, 3.2 Jy, and 2.7 Jy at the restart of array operations in January to February 2021, and have peaked in April 2021 at 6.6 Jy, 4.4 Jy, and 3.8 Jy, respectively. The third flare has begun in June 2021 and reached the highest flux densities in ALMA monitoring at 7.62 +- 0.08 Jy, 4.97 +- 0.03 Jy, and 4.24 +- 0.05 Jy, respectively, on August 4-6, 2021. Linearly polarized flux densities and polarization degrees in the second flare stage were 0.19 Jy (2.8 +- 0.5%), 0.12 Jy (2.7 +- 0.4%), and 0.22 Jy (5.7 +- 0.9%), and increased to 0.26 +- 0.06 Jy (3.4 +- 0.9%), 0.32 +- 0.02 Jy (6.5 +- 0.4%), and 0.35 +- 0.01 Jy (8.3 +- 0.3%), respectively, in the third stage. The electric-vector position angle (EVPA) of linear polarization was ~ -80 deg at the second flare stage and changed to -30 deg in the third stage. See the detail of mm/sub-mm measurements: http://www.alma.cl/~skameno/AMAPOLA/J0423-0120.flux.html
|
2021-08-11 19:39:00
|
radio,millimeter,sub-millimeter,agn,blazar,quasar
|
2021-08-11
|
19:39:00
| 1,403 |
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] | 14,845 |
14,848 |
Early Swift-XRT observations of the 2021 eruption of RS Oph
|
K. L. Page, J. P. Osborne (U. Leicester) & E. Aydi (MSU)
|
The recurrent nova RS Oph was announced to have re-erupted on 2021 August 8 (K. Geary; vsnet-alert 26131), and has subsequently been detected at high energies by Fermi-LAT (ATels #14834 and #14845), H.E.S.S. (ATel #14844) and MAXI/GSC (ATel #14846).
Swift began observing RS Oph on 2021 August 9.9, 1.3 days after the first hint of an optical brightening on 2021 Aug. 8.57 (taken from AAVSO data). At this time, a bright, hard X-ray source was seen, at a count rate of 3.63 +/- 0.06 count s-1 (0.3-10 keV; single pixel events only). A second observation, on day 2.2, showed the count rate to have increased to 6.85 +/- 0.08 count s-1. Each spectrum can be parameterised by an absorbed, single-temperature optically thin component. While the temperature does not change noticeably between the two observations (kT = 5.8 +0.9/-0.7 and 6.1 +1.0/-0.8 keV, respectively), the total absorbing column is found to decrease substantially, from (12.2 +0.8/-0.7) x 1022 cm-2 during the first observation, to (5.9 +/- 0.3) x 1022 cm-2 during the second. For comparison, the ISM value in the direction of RS Oph is 2.4 x 1021 cm-2. The unabsorbed 0.3-10 keV flux increased from (1.32 +/- 0.09) x 10-9 to (1.5 +/- 0.07) x 10-9 erg cm-2 s-1 between the two observations.
The declining absorption is thought to be caused by the progression of the ejecta shock expanding through the wind from the red giant companion (Sokoloski et al., 2006 Nature, 422, 276; Bode et al., 2006, ApJ, 652, 629). These recent Swift observations were obtained slightly earlier than those following the 2006 event.
Due to the current optical brightness of the nova, no Swift/UVOT data can currently be collected.
Swift monitoring continues with a daily cadence. We thank the Swift PI for approving these observations, and the Swift MOC team for implementing them.
|
2021-08-12 00:57:00
|
optical,x-ray,nova
|
2021-08-12
|
00:57:00
| 1,829 |
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] | 14,846 |
14,849 |
AMI-LA, e-MERLIN and MeerKAT radio detections of RS Oph in outburst
|
David Williams (JBCA/Manchester), Tim O'Brien (JBCA/Manchester), Patrick Woudt (UCT), Miriam Nyamai (UCT), Dave Green (MRAO, Cambridge), David Titterington (MRAO, Cambridge), Rob Fender (Oxford), Greg Sivakoff (U. Alberta)
|
Following multi-wavelength reports of a new outburst of the recurrent nova RS Ophiuchi, http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/26131 (see also ATel #14834, #14838, #14840, #14844, #14845, #14846, #14848), we requested observations in the radio band with the Arcminute Microkelvin Imager Large Array (AMI-LA; Zwart et al. 2008; Hickish et al. 2018) at 15.5 GHz, e-MERLIN at 5 GHz and MeerKAT at 1.28 GHz. AMI-LA observations were requested as part of a long term transients monitoring programme (PI: Fender). They started on 2021-08-09.77 and 2021-08-10.77 and each epoch lasted for 4 hours. We used a custom pipeline, REDUCE_DC (Perrott et al. 2015) to calibrate the data, using 3C286 as the flux calibrator and J1804+0101 as the phase calibrator. Due to a reduced number of antennas in the array, we conservatively use flux uncertainties of 10%. In our preliminary analysis, we detect RS Oph at a flux density of 0.80+/-0.08 mJy on 2021-08-09.77 and 1.50+/-0.15 mJy on 2021-08-10.77. The image noise levels were 0.15mJy/beam on 2021-08-09.8 and 0.2mJy/beam on 2021-08-10.8, respectively. The e-MERLIN observations were obtained via a director's discretionary time request. They started on 2021-08-10.60 and lasted 12 hours, including all calibrators. In this observation, 3C286 was used as a flux calibrator, OQ208 was used as a band pass calibrator and J1745-0753 was used as a phase calibrator. The data were calibrated using the e-MERLIN CASA Pipeline (Moldon et al. 2018). In our preliminary analysis, we detect RS Oph at a flux density of 0.38 +/- 0.06 mJy with an image noise of 40 uJy/beam. The MeerKAT data were obtained as part of a director's discretionary time request and started on 2021-08-10.95, for an 0.5 hour observation. The initial SARAO SDP quick-look image detects RS Oph at a flux density of 0.29 +/- 0.03 mJy, with an image noise of 12 uJy/beam. The previous earliest detection of radio emission from RS Oph in outburst was 4.4 days after the peak of the visual light curve (Eyres et al. 2009). All of the detections presented here were obtained ~2 days after the start of the outburst and are the earliest radio detections of this source in outburst. We plan to continue monitoring this source to follow the radio evolution with AMI, and have requested further e-MERLIN and MeerKAT observations. We would like to thank the MRAO, JBO and SARAO staff for carrying out these observations. AMI-LA is supported by the Universities of Cambridge and Oxford. e-MERLIN is a National Facility operated on behalf of the Science & Technology Facilities Council by the University of Manchester at Jodrell Bank Observatory. The MeerKAT telescope is operated by SARAO, which is a facility of the National Research Foundation, an agency of the Department of Science and Innovation.
|
2021-08-12 03:59:00
|
radio,nova,transient
|
2021-08-12
|
03:59:00
| 2,812 |
[
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] | 14,847 |
14,850 |
NICER X-ray observations of the recurrent nova RS Ophiuchi
|
Teruaki Enoto (RIKEN), Hiroyuki Maehara (National Astronomical Observatory of Japan), Marina Orio (University of Wisconsin and INAF-Padova), Andrew Fabian (IoA, Cambridge), Michael Parker (IoA, Cambridge), Keith Gendreau (NASA/GSFC), Zaven Arzoumanian (NASA/GSFC), Pragati Pradhan (MIT Kavli Institute for Astrophysics and Space Research), Elizabeth C. Ferrara (University of Maryland, CRESST, NASA/GSFC), Jon M. Miller (Univ. of Michigan)
|
A new outburst of the recurrent nova RS Opiuchi (RS Oph) was reported on 2021 August 8 (ATels #14834, #14838, #14840, #14846), 15 years after the last outburst in 2006 (ATel #737). The Neutron Star Interior Composition Explorer (NICER) observed RS Oph on 2021 August 10, from 11:57:00 to 12:14:20 UTC, with an exposure of 942 sec. This observation was coordinated simultaneously with optical monitoring of the 3.8-meter SEIMEI Telescope to study the maximum of the optical light curve.
|
2021-08-12 04:52:00
|
optical,x-ray,neutron star,nova,star
|
2021-08-12
|
04:52:00
| 485 |
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] | 14,848 |
14,851 |
Nova RS Oph: upper limits from a search for coincident neutrinos with IceCube
|
Alex Pizzuto (UW-Madison), Justin Vandenbroucke (UW-Madison), Marcos Santander (UAlabama) for the IceCube Collaboration
|
The IceCube Collaboration (http://icecube.wisc.edu/) reports: IceCube has performed a search for track-like muon neutrino events arriving from the direction of the recurrent nova RS Ophiuchi (ATel #14838), which was also detected as a GeV gamma-ray source by Fermi-LAT (ATel #14834 and ATel #14845) as well as a VHE gamma-ray source by H.E.S.S. (ATel #14844). The search was performed using a time window three days in duration which covered the beginning of the observed optical outburst (2021-08-08 12:00:00 UTC to 2021-08-11 12:00:00 UTC), during which IceCube was collecting good quality data. We find that the data are consistent with atmospheric background expectations, with a p-value of 1.0. We accordingly derive a time-integrated muon-neutrino flux upper limit for this source of E^2 dN/ dE = 4.8 x 10^-5 TeV cm^-2 at 90% CL, under the assumption of an E^-2 power law. 90% of events IceCube would detect from a source at this declination with an E^-2 spectrum are between approximately 2 TeV and 10 PeV. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at [email protected].
|
2021-08-12 05:37:00
|
optical,gamma ray,tev,vhe,neutrinos,nova
|
2021-08-12
|
05:37:00
| 1,221 |
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] | 14,849 |
14,852 |
SALT high resolution spectroscopy of RS Oph: evidence for acceleration of the nova ejecta
|
Joanna Mikolajewska (NCAC PAS), Elias Aydi (MSU), David Buckley (SAAO), Cezary Galan (NCAC PAS), Marina Orio (UoW/INAF)
|
We report on high-resolution optical spectroscopy of the symbiotic recurrent nova RS Oph (see ATels #14834, #14838, #14840, #14844, #14845, #14846, #14848) taken with the Southern African Large Telescope (SALT). The observations were acquired on 2021-08-10.87 UTC, about 2 days after the outburst, with the nova at V ~ 5.2 mag. We used the High-Resolution Spectrograph (HRS; Crause et al. 2014, Proc. SPIE, 91476). The 30 s, 300 s, and 600 s spectra were taken in the HR mode of HRS with resolving power R~65000 - 740000 and wavelength coverage of 3800-8800 Å. The data were reduced with the SALT HRS MIDAS pipeline ( Kniazev et al. 2016, MNRAS 459, 3068). The spectrum is dominated by broad P Cygni profiles of Balmer H I, Fe II, O I, and Mg II, along with weaker, broad lines of He I and [O I]. The presence of strong Fe II lines is particularly interesting. The Fe II (42) lines are the main contributors to the emission features at 4924 and 5018, respectively, and the Fe II (42) at 5169 is as strong. On the top of nova H I, He I, and Fe II lines, the narrow emission with central reversal, typical for symbiotic stars is also present. The expansion velocity of the ejecta estimated from the Hα and Hβ P Cyg profiles is ~-4200 km/s and ~-4700 km/s from the absorption center and the blue absorption edge, respectively, which compared with the velocities of ~ -3700 and -2700 km/s reported by Munari (ATel #14840) indicates that the ejecta are accelerating. The NaI D and CaII H & K lines reveal complex profiles. In particular, in addition to strong interstellar lines, there are remarkable components at ~-48, ~-63, and ~-77 km/s, respectively, blueshifted with respect to the systemic velocity (γ=-38.7 km/s), practically identical with those reported by Patat et al. (2011, A&A 530, A63) and associated with circumstellar material. SALT observations will be continued. Based on observations collected under the SALT transient followup program 2018-2-LSP-001. Polish participation in SALT is funded by grant MNiSW DIR/WK/2016/07. JM and CG also acknowledge support from NCN 2017/27/B/ST9/01940. Tentative emission line identifications: H I (Balmer): 3970, 4102, 4340, 4861 and 6563 Å He I: 4471, 4924, 5016, 5876, 6678, and 7065 Å O I: 7477, 7773, and 8446 Å [O I]: 6364 Å Mg II: 8232 Å
|
2021-08-12 09:47:00
|
optical,nova,star,transient
|
2021-08-12
|
09:47:00
| 2,293 |
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] | 14,850 |
14,853 |
Erratum to ATel #14842 regarding the position of the probable nova in M31
|
A. Valcheva (Sofia University, Bulgaria), A. Kostov (IA and NAO, BAS, Bulgaria), P. Nedialkov (Sofia University, Bulgaria)
|
In ATel #14842 the distance of the probable nova from the center of M31 should be 53''.7 west and 424''.0 south.
|
2021-08-12 16:36:00
|
optical,nova,transient
|
2021-08-12
|
16:36:00
| 112 |
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] | 14,851 |
14,854 |
BL Lac still in optical high state
|
M. Minev (Sofia University; IA and NAO, Bulgaria), A. Valcheva (Sofia University, Bulgaria), A. Kostov (IA and NAO, BAS, Bulgaria), R. Vasileva, R. Mitrev
|
We perform optical monitoring of the flaring blazar BL Lacertae (ICRS coords. (ep=J2000): RA 22 02 43.291 Dec +42 16 39.978). It is still in a high optical state (as reported in Atel #14820) with slightly decreasing flux in the last five days and rapid intranight flux variability. The maximum R-band magnitude we have measured is 11.28 ± 0.01 mag on 2021 Aug 06.934 UT (JD 2459433.431). Our whole night monitoring from 2021 Aug 9.834 (20:01 UT – JD 2459436.3341) to 2021 Aug 10.051 (01:13 UT – JD 2459436.5509) show increase in R-band brightness of 0.27 ± 0.04 mag (from 11.70 ± 0.03 mag to 11.43 ± 0.03 mag) and in V-band of 0.29 ± 0.04 mag (from 12.29 ± 0.03 mag to 12.00 ± 0.03 mag).
Here we report the following brightness values:
B - band magnitudes: 2021 Aug 06.941 (JD 2459433.441) 12.72 ± 0.02 mag 2021 Aug 08.907 (JD 2459435.407) 13.11 ± 0.02 mag V - band magnitudes: 2021 Aug 06.937 (JD 2459433.437) 11.86 ± 0.01 mag 2021 Aug 08.898 (JD 2459435.398) 12.23 ± 0.02 mag 2021 Aug 09.830 (JD 2459436.330) 12.29 ± 0.03 mag 2021 Aug 10.053 (JD 2459436.553) 12.00 ± 0.03 mag 2021 Aug 10.952 (JD 2459437.452) 12.28 ± 0.03 mag 2021 Aug 11.047 (JD 2459437.547) 12.32 ± 0.03 mag R - band magnitudes: 2021 Aug 06.931 (JD 2459433.431) 11.28 ± 0.01 mag 2021 Aug 08.893 (JD 2459435.393) 11.62 ± 0.02 mag 2021 Aug 09.834 (JD 2459436.334) 11.70 ± 0.03 mag 2021 Aug 10.051 (JD 2459436.551) 11.43 ± 0.03 mag 2021 Aug 10.958 (JD 2459437.458) 11.68 ± 0.03 mag 2021 Aug 11.042 (JD 2459437.542) 11.71 ± 0.03 mag I - band magnitudes: 2021 Aug 06.934 (JD 2459433.434) 10.55 ± 0.01 mag 2021 Aug 08.895 (JD 2459435.395) 10.88 ± 0.02 mag
Our photometric data are obtained with the 50/70-cm Schmidt telescope at Rozhen NAO, Bulgaria and 20-cm Newton telescope at the "Beli Brezi" Astronomy Summer School near Kardzhali, Bulgaria both equipped with standard Johnson-Cousins photometric filters. For the aperture photometry, we have used the specifications of the GASP list of WEBT (ahttps://www.oato.inaf.it/blazars/webt/gasp/fc/2200fc.html).
The work was partially supported by the Ministry of Education and Science of the Republic of Bulgaria, National RI Roadmap Project DO1-383/18.12.2020, NSF Bulgaria grant DN18/10-11.12.2017 and America for Bulgaria Foundation.
|
2021-08-12 20:39:00
|
optical,agn,blazar
|
2021-08-12
|
20:39:00
| 2,253 |
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-0.04579474776983261
] | 14,852 |
14,855 |
INTEGRAL detection of RS Oph in outburst at hard X-rays
|
C. Ferrigno, V. Savchenko, E. Bozzo (ISDC/University of Geneva, CH), P. Thalhammer (Remeis-Observatory & ECAP, FAU Erlangen-Nuernberg), J. J.E. Kajava, C. Sánchez-Fernández (ESAC/ESA, Spain), A. Domingo (CAB/CSIC-INTA, Spain), L. Ducci (IAAT, Germany), L. Sidoli, A. Paizis (INAF-IASF Milano, Italy), J. Chenevez (DTU Space, Denmark), J. Wilms (Remeis-Observatory & ECAP, FAU Erlangen-Nuernberg), E. Kuulkers (ESTEC/ESA, The Netherlands)
|
A new outburst of the Recurrent Nova RS Ophiuchi (RS Oph) was detected on 2021- 08-08 (ATels #14834, #14838, #14840, #14844, #14845, #14846, #14848, #14849, #14850, #14852), 15 years after its previous outburst in 2006 (ATel #737). The Galactic center region is regularly monitored by INTEGRAL and the source was in the field of view of the IBIS/ISGRI imager (28 â1000 keV) during the observations performed from 2021-08-07 17:04 UTC to 21-08-08 21:30 and from 2021-08-10 14:27 UTC to 2021-08-11 05:10 UTC. It was also within the smaller field of view of the JEM-X monitor (3-25 keV) from 2021-08-10 14:28 UTC to 2021-08-10 21:30 UTC.
RS Oph was marginally detected (6 σ) in the 28-40 keV IBIS/ISGRI energy band at a level of about 10 mCrab and firmly detected (37 sigma) by JEM-X at a level of 49±2 mCrab (3-10 keV) and 47±7 mCrab (10-25 keV). The JEM-X light curve does not show any significant variation during the observation.
We fit the combined preliminary spectrum built using all the available JEM-X (12 ks) and IBIS/ISGRI (65 ks) data. The emission is well described (reduced χ2 of 1.3 with 17 degrees of freedom) by an absorbed collisional equilibrium plasma model (mekal in Xspec) with a temperature kT=8.4±1.0 keV and an equivalent hydrogen column density below 2x1022 cm-2 (at 3 σ). The 3-20 and 20-100 keV fluxes are 1.1e-10 ergs/cm2/s and 7.2e-11 ergs/cm2/s, respectively. These results are based on a preliminary energy calibration of the JEM-X camera and should be used with caution.
We also extracted the data provided by the Optical Monitoring Camera (OMC) onboard INTEGRAL. Due to the current source brightness, (Vmag=5.5), the available OMC images are saturated.
INTEGRAL will continue monitoring the Galactic Center region for the next month. RS Oph will be often in the field of view of its instruments.
|
2021-08-13 05:37:00
|
optical,x-ray,gamma ray,nova
|
2021-08-13
|
05:37:00
| 1,832 |
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] | 14,853 |
14,856 |
The Orbital and Pulse Periods of V1674 Herculis
|
J. Patterson (Columbia Univ.), M. Epstein-Martin (Columbia Univ.), T. Vanmunster (CBA-Belgium), J. Kemp (Middlebury Coll.), on behalf of the Center for Backyard Astrophysics collaboration
|
We have carried out time-series photometry of V1674 Herculis = Nova Her 2021 with the globally distributed telescopes of the Center for Backyard Astrophysics. During 2021 July 1 - August 10, the star displayed a strong double-humped photometric signal at 0.15302(2) days, and another strong signal at 8.3586(3) minutes. The latter seems consistent with the 8.357 min signal detected in pre-outburst ZTF data by Mroz et al. (ATel #14720), and the 8.4 min X-ray signal reported in outburst by Maccarone et al. (ATel #14776). Writing our two strong signals as Omega and omega, we find weaker but clear detections at omega-Omega and omega-2Omega. This is all standard fare for an intermediate polar (DQ Her star), although there is no precedent for such signals in so bright a star (M_V~0), and so far above quiescence (7 mag). The mean orbital light curve of V1674 Her during 2021 July 1 - August 10 is shown at https://cbastro.org/the-astronomers-telegram/2021-august/ . The amplitude grew significantly during this interval, when the V-band brightness faded by 2 magnitudes.
|
2021-08-13 06:24:00
|
optical,x-ray,binary,cataclysmic variable,nova,star,transient,variables
|
2021-08-13
|
06:24:00
| 1,073 |
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] | 14,854 |
14,857 |
H.E.S.S. observations of soft spectrum VHE gamma-ray emission from the recurrent nova RS Ophiuchi
|
Stefan J. Wagner, for the H. E.S. S. collaboration
|
Following the detection of very-high-energy gamma-ray emission the recurrent nova RS Ophiuchi currently in outburst (ATel #14844), H.E.S.S. observations continued on August 10th and August 11th for about 5h each night. A continued VHE gamma-ray excess compatible with the direction of RS Ophiuchi is seen in these two nights, with comparable significance to the night of August 9 (ATel #14844). The Fermi/LAT collaboration (Cheung et al, ATel #14845) reports a brightening of the nova in >100 MeV gamma-rays with a hard spectrum (single power law spectral index 1.9 +/- 0.1) up to ~10 GeV. In the VHE energy band covered with the H.E.S.S. telescopes, for the three nights August 9-11, a preliminary onsite analysis shows a significantly softer power law spectral index (> 3) than that reported by Fermi-LAT. This implies that a spectral break occurs between the >100 MeV to ~13 GeV range of the Fermi-LAT data and the higher energy range of the H.E.S.S. data. Further H.E.S.S. observations are planned. We strongly encourage follow-up at all wavelengths (see also ATels #14834, #14838, #14840, #14845, #14846, #14848, #14849, #14850, #14851, #14852, #14855). H.E.S.S. is an array of five imaging atmospheric Cherenkov telescopes for the detection of very-high-energy gamma-ray sources and is located in the Khomas Highlands in Namibia. It was constructed and is operated by researchers from Armenia, Australia, Austria, France, Germany, Ireland, Japan, the Netherlands, Poland, South Africa, Sweden, UK, and the host country, Namibia. For more details see https://www.mpi-hd.mpg.de/hfm/HESS/
|
2021-08-13 07:03:00
|
gamma ray,tev,vhe,nova
|
2021-08-13
|
07:03:00
| 1,591 |
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0.016783934086561203,
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0.10422074049711227,
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-0.017757367342710495,
0.047034889459609985,
-0.10801868140697479,
0.022678738459944725,
0.014609009027481079,
-0.058547984808683395,
-0.003378526773303747,
-0.009931501932442188,
0.02163533866405487,
-0.07245931029319763,
-0.08993995189666748,
0.0008399082580581307,
-0.0840049684047699,
0.008421886712312698,
0.051263660192489624,
0.05683904513716698,
0.08152926713228226,
-0.06483801454305649,
0.06689593940973282,
0.05009136348962784,
-0.11840783059597015,
0.0731324851512909,
-0.055640965700149536,
-0.09645301103591919,
0.03983893617987633,
0.010965276509523392,
-0.02563687413930893,
-0.0029050251469016075,
-0.0013866674853488803,
-0.10210025310516357,
-0.14650771021842957,
-0.06991655379533768,
-0.04093940183520317,
-0.02825338765978813,
-0.0024745087139308453,
-0.05450486019253731,
0.14052262902259827,
-0.0947040393948555,
-0.13389453291893005,
0.0315689891576767
] | 14,855 |
14,858 |
Further Spectroscopic Follow-up Observations of RS Ophiuchi with Seimei Telescope
|
Kenta Taguchi (Kyoto University), Hiroyuki Maehara (National Astronomical Observatory of Japan), Keisuke Isogai, Yusuke Tampo, Junpei Ito (Kyoto University)
|
We report our optical spectroscopy of the 2021 outburst of the recurrent nova RS Ophiuchi (cvnet-outburst 753, vsnet-alert 26131, CBET 5013, 5015, ATels #14834, #14838, #14840, #14844, #14845, #14846, #14848, #14849, #14850, #14851, #14852, #14855, #14857), additional to the one reported in ATel #14838. We took spectra of RS Ophiuchi from 2021-08-10.498 to 2021-08-10.502 and from 2021-08-11.530 to 2021-08-11.534 simultaneously with the NICER X-ray observation (ATel #14850) by using the fiber-fed integral field spectrograph (KOOLS-IFU; Matsubayashi et al. 2019) mounted on the 3.8-m Seimei telescope (Kurita et al. 2020) at Okayama Observatory of Kyoto University.
As reported in ATel #14852, we confirmed the velocity of the P Cyg absorption component in the Hβ line, measured from the emission peak, had significantly increased between August 9th and 10th: ∼ −2600 km/s on 2021-08-09.44 (ATel #14838), ∼ −4200 km/s on 2021-08-10.50, and ∼ −4300 km/s on 2021-08-11.53. The FWZI of Hα had also increased between August 9th and 10th: ∼ 3400 km/s on 2021-08-09.44, ∼ 7300 km/s on 2021-08-10.50, and ∼ 7800 km/s on 2021-08-11.53. Although the continuum flux had decreased between August 9th and 10th, the Balmer and O I line fluxes had increased. Also, the He I lines (e.g., 5876 Å) became more prominent.
|
2021-08-13 14:56:00
|
optical,x-ray,cataclysmic variable,nova,transient,variables
|
2021-08-13
|
14:56:00
| 1,308 |
[
-0.10615323483943939,
-0.08149518817663193,
0.032131798565387726,
0.028561215847730637,
0.029687248170375824,
-0.062015172094106674,
-0.05568091198801994,
0.053099602460861206,
-0.014585848897695541,
0.022924603894352913,
-0.011559847742319107,
-0.035103198140859604,
-0.04162637144327164,
-0.01117099542170763,
0.051468461751937866,
0.028858715668320656,
0.056718483567237854,
-0.07911474257707596,
0.057023532688617706,
0.04195433109998703,
-0.00012072420940967277,
0.07495994120836258,
-0.05813024565577507,
0.0024421706330031157,
0.05791417881846428,
0.043682780116796494,
-0.06978095322847366,
0.028451021760702133,
0.022149622440338135,
0.00690642511472106,
0.07189250737428665,
0.002141533186659217,
-0.021709999069571495,
0.03469846025109291,
0.038395147770643234,
-0.021939899772405624,
0.032701652497053146,
-0.05901505798101425,
-0.007397977169603109,
0.0011122053256258368,
0.003257062751799822,
-0.04971552640199661,
0.00439026765525341,
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0.04375584423542023,
-0.09250715374946594,
-0.028714090585708618,
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-0.013207567855715752,
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-0.013997598551213741,
0.00717316335067153,
0.02764885500073433,
0.05676940083503723,
0.06900260597467422,
0.013760956935584545,
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-0.06914138048887253,
0.07494070380926132,
0.011481497436761856,
0.02398318611085415,
-0.027851838618516922,
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0.03667101263999939,
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0.006131764035671949,
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0.04885898530483246,
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0.002458689734339714,
0.03254855051636696,
0.0071976627223193645,
-0.037419017404317856,
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0.09583615511655807,
0.10617844760417938,
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0.031820546835660934,
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0.012778379023075104,
0.014856560155749321,
0.006254072766751051,
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0.05530665069818497,
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0.02845921367406845,
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0.03157230466604233,
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0.0027308352291584015,
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0.003362812101840973,
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0.07614470273256302,
0.038213007152080536,
0.04786263778805733,
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0.027054648846387863,
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8.293034768550496e-33,
0.0662892609834671,
0.07606560736894608,
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0.0258766021579504,
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0.07376476377248764,
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0.10972561687231064,
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0.030483797192573547,
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0.08240513503551483,
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0.08416114747524261,
0.009514722973108292,
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0.13660863041877747,
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0.004225405398756266,
0.08532072603702545,
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0.01085838582366705,
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0.07708900421857834,
0.0035893083550035954,
-0.08568169921636581,
0.036715131253004074,
-0.027874784544110298,
0.0517110638320446,
0.04108274355530739,
-0.018444722518324852,
0.10900626331567764,
-0.04673123359680176,
0.03858575224876404,
-0.04105072468519211,
-0.13954924046993256,
-6.442348952243364e-33,
0.033944468945264816,
0.0429566353559494,
-0.0753871500492096,
0.00729800621047616,
-0.0168154314160347,
-0.032039422541856766,
-0.01639173924922943,
0.11136619001626968,
-0.058404870331287384,
-0.09613461047410965,
0.09562595933675766,
0.018537472933530807,
-0.018443822860717773,
-0.042603570967912674,
0.011253660544753075,
-0.0199211947619915,
-0.018509570509195328,
-0.05519017204642296,
-0.0059623438864946365,
-0.001579862553626299,
0.023216404020786285,
0.005182507913559675,
0.0665992796421051,
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0.02538248337805271,
0.034558411687612534,
0.07839042693376541,
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0.011727052740752697,
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0.0008834627806209028,
0.00981020275503397,
0.043106235563755035,
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0.08026134967803955,
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0.15479888021945953,
0.012470907531678677,
0.034636761993169785,
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0.024328071624040604,
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0.09348445385694504,
0.033754296600818634,
-0.09713216125965118,
0.03931599482893944,
-0.0065743993036448956,
0.022879526019096375,
0.05936495587229729,
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0.04463741555809975,
0.0759490355849266,
0.018395299091935158,
-0.06226493790745735,
0.05519851669669151,
0.01591012068092823,
-0.022777749225497246,
0.02084653452038765,
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0.06610792875289917,
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0.010720706544816494,
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0.043911710381507874,
-0.06755538284778595,
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0.03317602351307869,
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0.02534039318561554,
-0.009693204425275326,
-0.03876276686787605,
0.05063777416944504,
0.04504859820008278,
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0.07017860561609268,
0.03374983370304108,
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0.07192400097846985,
0.03888581320643425,
-0.07173679023981094,
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-0.049511462450027466,
-0.028191952034831047,
-0.014877159148454666,
-0.00022665322467219085,
0.05254106596112251,
0.11667126417160034,
-6.334292379506223e-8,
-0.000369563524145633,
0.04530545696616173,
-0.07791111618280411,
0.051446583122015,
0.03157377615571022,
-0.020185066387057304,
-0.020672067999839783,
0.0396924689412117,
0.05002925172448158,
0.05096777528524399,
0.11480485647916794,
-0.019532786682248116,
0.031716495752334595,
-0.06635746359825134,
0.00796232745051384,
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0.013559098355472088,
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0.0700075626373291,
0.0021201428025960922,
0.061495449393987656,
-0.07841144502162933,
0.013156627304852009,
0.007501922082155943,
-0.04934781417250633,
0.057732585817575455,
0.026928890496492386,
-0.025806831195950508,
-0.004659147467464209,
-0.052111007273197174,
0.03201240673661232,
-0.05380069091916084,
-0.041079409420490265,
0.07942994683980942,
-0.132064089179039,
0.019238771870732307,
0.06353532522916794,
0.03829137608408928,
0.024263694882392883,
-0.05583415552973747,
0.018084093928337097,
0.029958970844745636,
-0.02353046089410782,
0.04731999337673187,
-0.015578394755721092,
-0.07156636565923691,
0.004558909684419632,
-0.03796887770295143,
-0.018763497471809387,
-0.03840966895222664,
0.044864725321531296,
-0.02267964743077755,
-0.10471884906291962,
-0.03850565850734711,
-0.07776688784360886,
-0.05531639978289604,
-0.01804886944591999,
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0.09804204851388931,
-0.0407051146030426,
-0.12131142616271973,
-0.014319497160613537
] | 14,856 |
14,859 |
MASTER discovery PSN and two OT
|
Y. Kechun, P. Balanutsa, V. Shumkov, V. Lipunov, V. Kornilov, E. Gorbovskoy, I. Gorbunov, O. Gress, N. Tyurina, A. Kuznetsov, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, A. Chasovnikov, E. Minkina, V. Topolev, D. Kuvshinov, K. Zhirkov, T. Pogrosheva, V. Shumkov (Lomonosov Moscow State University), D. Buckley (SAAO), R. Podesta, F. Podesta, C. Lopez, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), N. Budnev, O. Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
|
MASTER OT J031751.52-594207.3 discovery PSN PGC127966
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )discovered OT source at (RA, Dec) = 03h 17m 51.52s -59d 42m 07.3s on 2021-08-13.31940 UT. The OT magnitude in unfiltered is 17.3m (mlim=19.7). The OT is seen in 2 images for 2021-08-13 and OT is seen in 2 images for 2021-07-26. There is no minor planet at this place. We have reference image on 2020-09-22.28261 UT with unfiltered 19.5m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/031751.52-594207.3.png
MASTER OT J142819.98-511343.6 discovery
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 14h 28m 19.98s -51d 13m 43.6s on 2021-08-06.86112 UT. The OT unfiltered magnitude is 18.2m (mlim=19.3). The OT is seen in 11 images. The object is also visible on 7 images for 2015-01-03 and 2015-01-05. There is no minor planet at this place. We have reference image on 2019-05-10.97500 UT with unfiltered mlim=20.0m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/142819.98-511343.6.png
MASTER OT J142336.53-543107.5 discovery
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 14h 23m 36.53s -54d 31m 07.5s on 2021-08-05.79994 UT. The OT unfiltered magnitude is 17.2m (mlim=19.5). The OT is seen in 13 images. The object is also visible on 1 images for 2014-12-18. There is no minor planet at this place. We have reference image on 2020-03-21.85895 UT with unfiltered mlim=20.8m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/142336.53-543107.5.png
|
2021-08-14 00:13:00
|
cataclysmic variable,nova,planet,supernovae,transient,variables
|
2021-08-14
|
00:13:00
| 1,849 |
[
-0.04717854782938957,
-0.0827125832438469,
-0.04846753552556038,
0.014232862740755081,
0.0066742924973368645,
0.003590503940358758,
-0.04493556171655655,
0.012403118424117565,
0.03064911440014839,
-0.06106765940785408,
-0.03614704683423042,
-0.030027953907847404,
-0.04934748262166977,
-0.02784935012459755,
0.05519945174455643,
-0.010689813643693924,
0.03092299960553646,
-0.02646845392882824,
0.03176363185048103,
0.03887413814663887,
0.01556325051933527,
-0.025574134662747383,
-0.07212527841329575,
0.02262384258210659,
0.03823389858007431,
0.06398770958185196,
-0.141122505068779,
0.03778219223022461,
-0.054330505430698395,
-0.023134764283895493,
-0.018351107835769653,
0.05217545107007027,
-0.06410717219114304,
0.02729366347193718,
0.0003276085772085935,
0.07675115764141083,
-0.0676361545920372,
-0.05954455956816673,
0.0013852675911039114,
0.014374255202710629,
-0.001709891832433641,
-0.00941373035311699,
-0.03263610601425171,
0.0760149210691452,
0.009746910072863102,
-0.033496834337711334,
-0.012922020629048347,
-0.04716410115361214,
-0.011211528442800045,
-0.05808502063155174,
-0.010313587263226509,
0.0025836534332484007,
-0.0004857635067310184,
0.07292473316192627,
0.013563413172960281,
0.02199665457010269,
-0.0831071063876152,
-0.01207954715937376,
0.05272766202688217,
-0.027004385367035866,
-0.017926327884197235,
-0.02165953814983368,
-0.042916204780340195,
-0.023804284632205963,
0.018360113725066185,
-0.05765837803483009,
-0.08567498624324799,
-0.002487877616658807,
-0.0005591359222307801,
0.029533112421631813,
-0.02725306712090969,
0.07308018207550049,
-0.1168953999876976,
-0.08086248487234116,
-0.04074911028146744,
0.04617675766348839,
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] | 14,857 |
14,860 |
The narrowing lines of RS Oph, its recombining flashed-wind, and the persistent outer neutral regions from Echelle spectral monitoring
|
U. Munari (INAF Padova) and P. Valisa (ANS Collaboration)
|
We report about the spectroscopic evolution of RS Oph that we are monitoring at multi epochs each night with the Varese 0.84 + Echelle and Asiago 1.22m + B&C telescopes. The new 2021 eruption of this recurrent nova has triggered a widespread interest and observations over the whole electromagnetic spectrum (ATels #14834, #14838, #14840, #14844, #14845, #14846, #14848, #14849, #14850, #14852, #14855, #14857, #14858).
The very narrow emission component superimposed to the broad emission lines, probably originating in the slow wind of the red giant (RG) ionized by the initial UV-flash, is quickly declining in absolute flux, with an e-folding time of about 60 hours for Balmer and FeII lines. This recombination time corresponds to an electronic density of 1.1e+07 cm-3. The corresponding values for the 2010 outburst of V407 Cyg were about 100 hours and a density 6.6e+06 cm-3.
Contrary to the narrow components, the narrow absorptions (also superimposed to the broad emission) remains rather stable. Their heliocentric radial velocity is constant at -64 km/s. Compared with the barycentric velocity of RS Oph (-40 km/s, Fekel et al. 2000, AJ 119, 1375), these narrow absorption seems to originate in the outer and still neutral regions of the RG wind, characterized by a terminal wind velocity of about 24 km/s (at least toward the observer).
The broad emission lines originating from the nova ejecta are monotonically reducing their FWHM, supporting a continued deceleration of the ejecta while they plough through the RG wind and the circumstellar medium. The average FWHM of Hgamma and Hdelta is 3400, 3000, 2450, 2050 km/s for Aug 9.75, 10.75, 11.75, and 12.75 UT respectively. The P-Cyg absorptions have nearly vanished from most of the lines.
The latest Echelle spectra could be revealing the signature of a bipolar flow. A trapezoidal pedestal is apparently emerging in Halpha, as the broad component continues to shrink and the veiling from the flashed-wind is disappearing: on Aug 12.75 UT the pedestal is characterized by a velocity span of 4400 km/s at the top and 7500 km/s at the base. It seems visible in Hbeta too, but the blending with nearby FeII and HeI lines makes harder to distinguish it.
|
2021-08-14 01:30:00
|
optical,nova
|
2021-08-14
|
01:30:00
| 2,219 |
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] | 14,858 |
14,861 |
Spectroscopic classification of transients with the Lick Shane telescope
|
M. R. Siebert, K. W. Davis, K. Taggart, S. Tinyanont, R. J. Foley (UCSC)
|
We report the following classifications from spectroscopic observations with the KAST spectrograph on the Shane telescope obtained on 2021 August 13 UT. The targets AT 2021uyq and AT 2021vgn were supplied ALeRCE (selected from the ZTF data stream) and ZTF, respectively. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a Si II velocity of -9,500 km/s. (2) Blue and featureless continuum
|
2021-08-14 04:42:00
|
optical,supernovae,transient
|
2021-08-14
|
04:42:00
| 591 |
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0.025421878322958946
] | 14,859 |
14,862 |
Confirmation of AT2021vgi (= M31N 2021-08a) as the fourth observed eruption of the recurrent nova M31N 1997-11k
|
A. W. Shafter (SDSU), K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic), H. Kucakova (Ondrejov)
|
A. Valcheva et al. (ATel #14842, ATel #14853) recently reported that the position of the M31 transient AT2021vgi was within 0.45" of the known M31 nova M31N 2009-11b. To confirm the association between these two objects, we have obtained direct imaging of the field and found that the objects are spatially coincident to better that 0.4" (see the link to the comparison image below). The same instrumentation was used in acquiring both images (0.65-m at Ondrejov + CCD + R filter), with the M31N 2009-11b image taken on 2009 Nov. 26.779 UT and the M31N 2021-08a image taken on 2021 Aug. 12.017 UT. Since, as shown by Shafter et al. (2015, ApJS, 216, 34), M31N 2009-11b was the second observed recurrence of the known M31 recurrent nova M31N 1997-11k (the other recurrence being M31N 2001-12b), we confirm that AT2021vgi (= M31N 2021-08a) is the third observed recurrence (fourth observed eruption) of M31N 1997-11k.
Given that the three recurrences have occurred ~4, ~12, and ~24 years after the first observed eruption, it seems likely that the recurrence period of M31N 1997-11k is ~4 years. The recurrent nova is relatively faint (typically reaching a peak magnitude of just ~18.5), which may explain how predicted eruptions in 2013 and 2017 could have been missed. However, unlike the rapidly-recurring M31 nova M31N 2008-12a (Darnley et al. 2014, A&A, 563, 9; Tang et al. 2014, ApJ, 786, 61), M31N 1997-11k displays a relatively slow light curve evolution (t_2 ~ 90 d; Shafter et al. 2011, 734, 12), which should increase its likelihood of detection. Given its potentially very short recurrence time, M31N 1997-11k should be carefully monitored over the coming years to assure that future eruptions are not missed.
|
2021-08-14 12:53:00
|
optical,nova,transient
|
2021-08-14
|
12:53:00
| 1,720 |
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] | 14,860 |
14,863 |
Intrinsic linear polarization after the 2021 eruption of the recurrent nova RS Oph.
|
Nikolov, Y. (Institute of Astronomy and National Astronomical Observatory, Bulgarian Academy of Sciences & IAFE/Conicet, Argentina), Luna, G. J. M. (IAFE/Conicet, Argentina)
|
We report spectropolarimetric observations of the recurrent nova RS Oph obtained on August 10, 2021 20:14 UT (~1.9 days after the reported discovery on August 8.93 UT by K. Geary, VSNET alert N.26131) with the 2-Channel-Focal-Reducer Rozhen (FoReRo2), attached to the Cassegrain focus of the 2.0-m RCC telescope of the Bulgarian Rozhen National Astronomical Observatory. Intrinsic linear polarization was detected. The intrinsic degree of linear polarization is 1% at a position angle of 80 deg. The position angle is aligned with the highly collimated outflows detected during the past outburst in 2006 (e.g. Rupen et al. 2008, ApJ, 688, 559). Strong depolarization effects are well visible in H_alpha and He I 5876 emission lines. There is not an intrinsic component of linear polarization before the recurrent nova outburst (Nikolov, et al. 2019, Acta Astronomica, vol 69, no 4, p. 361-368). Variable linear polarization was observed during the 1985 outburst indicating the presence of intrinsic polarization (Cropper 1990). Cropper (1990) indicates that the intrinsic polarization developed during the outburst, and was not present at early times. Our spectropolarimetric observations before and after the 2021 outburst confirm this conclusion and suggest the early development of asymmetries in the outflow. A figure can be found at: https://drive.google.com/file/d/1WUrJXKyRlNKdtwy8vITqd6wgry9bo6kO/view?usp=sharing This work was supported by the Bulgarian Ministry of Education and Science under the National Research Programme Young scientists and postdoctoral students approved by DCM 577 / 17.08.2018 and by project number K$\Pi$-06-H28/2 08.12.2018, Bulgarian National Science Fund.
|
2021-08-15 11:27:00
|
optical,nova,variables
|
2021-08-15
|
11:27:00
| 1,693 |
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] | 14,861 |
14,864 |
X-ray brightening and softening of RS Ophiuchi monitored with NICER
|
Teruaki Enoto (RIKEN), Marina Orio (University of Wisconsin and INAF-Padova), Andrew Fabian (IoA, Cambridge), Michael Parker (IoA, Cambridge), Jon M. Miller (Univ. of Michigan), Pragati Pradhan (MIT Kavli Institute for Astrophysics and Space Research), Keith Gendreau (NASA/GSFC), Zaven Arzoumanian (NASA/GSFC), Hiroyuki Maehara (National Astronomical Observatory of Japan), Elizabeth C. Ferrara (University of Maryland, CRESST, NASA/GSFC), Richard Ignace (East Tennessee State University)
|
The NICER X-ray observatory continued daily-cadence monitoring of the ongoing outburst of the recurrent nova RS Opiuchi (RS Oph) for four additional days (see ATels #14834, #14838, #14840, #14846, #14850, #14851, #14852, #14855, #14857, #14858, #14860, #14863). As of August 15, there are 47 snapshots with a few hundred exposures for each. The accumulated exposure was 19.6 ks in total.
|
2021-08-18 06:02:00
|
x-ray,nova
|
2021-08-18
|
06:02:00
| 387 |
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] | 14,862 |
14,865 |
Enhanced X-Ray Activity of the southern TeV-Detected Blazar PKS 2155-304
|
Bidzina Kapanadze (Ilia State University, Tbilisi, Gerogia; E. Kharadze National Astrophysical Observatory, Abastumani, Georgia)
|
The southern TeV-detected blazar PKS 2155-304 (z=0.116) is a bright X-ray source and prominent with its very strong TeV/X-ray flaring behaviour (see, e.g., Aharonian et al. 2009, A & A, 502, 749; Abramowski et al. 2012, A & A, 539; Kapanadze et al. 2014, MNRAS, 444; 1076). Consequently, this object represents one of the frequent targets of X-Ray Telescope onboard Neil Gehrels Swift Observatory (Swift-XRT) in the southern hemisphere (262 observations with 405 ks of the total exposure time since 2005 November 17). During this monitoring, the 0.3-10 keV count rate showed an overall variability by a factor of 28 and maximum value of 11.4+/-0.2 cts/s, and the source underwent a very strong X-ray flare along with the unprecedented TeV outburst in 2006 July (along with the strong or moderate flares observed during next years; see https://www.swift.psu.edu/monitorin g/source.php?source=PKS2155-304). The flux varied on timescales from a few months down to very fast fluctuations within the 1-ks exposure (see, e.g., Kapanadze et al. 2014, MNRAS, 444, 1076). The spectra generally were curved and well-fitted with the log-parabolic model, yielding the ranges of the photon index at 1 keV $a$=2.05--2.75, curvature parameter $b$=0.13--0.80, the synchrotron SED peak location $E_p$=0.02--0.89 keV. Moreover, the source exhibits the signatures of the longer-term variations in the baseline X-ray level with timescales of several years, showing its lowest historical 0.3-10 keV count rate of ~0.4 cts/s in 2020 September. The Swift monitoring of PKS 2155-304 have been resumed in the framework of our Target of Opportunity (ToO) request Number 16167, and the today's Swift-XRT pointing to the source detected a significantly higher X-ray brightness, a factor of ~5 higher compared to the previous observation performed on 2020 September 26 with the 0.3-10 keV count rate of 2.0+/-0.1 cts/s. In the framework of one-zone SSC models, a flaring activity of PKS 2155-304 is also expected in the UV-radio and gamma-ray parts of the spectrum, and intensive multiwavelength observations of the source are strongly encouraged for discerning the underlying emission mechanisms and instable processes. XRT is one of the Swift instruments along with Burst Alert Telescope (BAT) and UV/Optical Telescope (UVOT). It is a JET-X Wolter I type telescope, developed jointly by Pennsylvania State University, Brera Astronomical Observatory (OAB) and University of Leicester. Thanks to the unique characteristics, good photon statistics and low background counts of this instrument (in combination with EEV CCD2 detector), we can investigate a flux variability on different time-scales from minutes to years, obtain high-quality spectra for the majority of the observations, derive different spectral parameters, and study their timing behaviour in the 0.3-10 keV range of the electromagnetic spectrum. The Swift Satellite is operated by Pennsylvania State University.
|
2021-08-19 03:46:00
|
radio,optical,x-ray,gamma ray,tev,blazar
|
2021-08-19
|
03:46:00
| 2,949 |
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] | 14,863 |
14,866 |
Infrared Spectroscopy of RS Oph on day +12 after the 2021 August Outburst
|
C. E. Woodward (U. Minnesota), A. Evans (Keele U., UK), D. P.K. Banerjee (PRL, India), S. Starrfield (Arizona State U), R. M. Wagner (Ohio State U.), R. D. Gehrz (U. Minnesota)
|
We report low resolution (R = 1200) 0.69-to-4.19-micron spectroscopy of RS Oph obtained on 2021 August 20.203 UT on the NASA IRTF 3.2 m telescope under excellent seeing conditions (0.6 arcsec in the K-band) 12 days after the 2021 August 8.083 UT eruption, complementing the on-going multi-wavelength study of this recurrent nova (ATEL#14864, #14860, #14857, #14852, #14848, #14834 among others). At this epoch (+12d), the infrared spectrum is dominated by hydrogen and helium emission lines, including Brackett 19-4 through 5-4, Humphreys 24-6 through 13-6, Pfund 23-5 through 8-5 series, and some of the Paschen series (both Pa-α, and Pa-β are saturated) Pa 12-3 through Pa 8-3, with HeI emission lines at 1.083, 1.197, 1.252, 1.700, 2.058, and 2.113 micron. Lines of carbon (e.g., CI 1.175 micron), nitrogen (e.g., NI 1.247 micron) and oxygen (e.g., OI 0.8446, 1.129, and 1.3171 micron) are present. An emission line tentatively identified as FeII 1.687 is on the red-wing of the Brackett-11 emission line profile. The FWHM of the H lines correspond to expansion velocities of the order 1250 km/s, and no P-Cygni profiles are evident. Representative observed integrated line fluxes (erg/s/cm2) for various lines include: Br-α 4.7e-10, Br-γ 3.2e-10, Br-δ 2.9e-10, Pf-ε 1.3e-10, HeI (2.058 micron) 4.5e-10, OI (0.8446 micron) 1.2e-9, and OI (1.3171 micron) 4.6e-11. The width of the emission lines is similar to those seen on day 12+ after the 2006 event (Evans et al. 2007, MNRAS 374, L1; Das, Banerjee and Ashok 2006, ApJL 653, L141). However, the peaks of the +12d 2021 hydrogen line profiles (as also are the peaks of the He profiles) clearly are asymmetric and saddle shaped with the blue wing being weaker than the peak intensity of the red wing; two-component Gaussian fits suggest two velocity components at -329.8 km/s and +227.0 km/s. The Paschen and Brackett limits at 0.85 micron and 1.5 micron are also evident as they were in the same evolutionary phase in 2006, suggesting flash ionization of the wind (Evans et al. 2008, MNRAS 374, L1). The spectral energy distribution shows no definitive evidence for dust or coronal line emission (see Banerjee et al. 2009, MNRAS 399, 357). Likely the onset of the coronal line emission phase is imminent as the evolution of the system proceeds, and follow-up spectroscopic observations are warranted.
The investigators appreciated the NASA IRTF for providing the quick-access DDT opportunity (2021B996), and we thank the observatory staff for their assistance.
|
2021-08-22 23:11:00
|
infra-red,nova
|
2021-08-22
|
23:11:00
| 2,514 |
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] | 14,864 |
14,867 |
Discovery of a Probable Nova in M31 or M110
|
K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
|
We report the discovery of a probable nova in the field of M110 on a co-added 900-s R-band CCD frame taken on 2021 Aug. 21.919 UT with the 0.65-m telescope at Ondrejov.
The object designated PNV J00394278+4135145 is located at R.A. = 0h39m42s.78, Decl. = +41o35'14".5 (equinox 2000.0), which is 2041.8" west and 1146.0" north of the center of M31, and 440.3" west and 353.0" south of the center of M110 (see link to discovery image below). Based on its spatial position it is not possible to firmly establish which of the two galaxies the nova is associated with. A spectroscopic observation of the nova candidate is encouraged due to its possible connection with M110 galaxy which produced only a very few observed novae up to the present day.
The following R-band magnitudes were obtained using the 0.65-m telescope at Ondrejov:
2021 Jun. 9.057 UT, [19.3; Aug. 21.919, 16.4 ± 0.1.
|
2021-08-23 01:41:00
|
optical,nova,transient
|
2021-08-23
|
01:41:00
| 885 |
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] | 14,865 |
14,868 |
ARAS Group spectroscopic monitoring of the latest outburst of RS Oph
|
S. N. Shore (Univ. of Pisa),H. Allen, M. Bajer, H. Barker, K. Bazan, P. Berardi, T. Bohlsen, C. Boussin, D. Boyd, E. Bryssinck, C. Buil, S. Charbonnel, S. Curry, J. B. Desrosiers, D. Doctor, P. A. Dubovsky, P. Dubreuil, C. Eldridge, L. Franco, O. Garde, J. Guarro, P. Le Dû, R. Leadbeater, V. Lecocq, J. Martin, F. Teyssier, O. Thizy, P. Velez (ARAS Group)
|
We report the results of continuing medium resolution (R > 9000) spectroscopic monitoring of RS Oph (see ATel#14866, #14834 and previous telegrams cited therein). Members of the ARAS group have been obtaining spectra with resolutions ranging from 500 to 30000. Higher resolution spectroscopic monitoring (R~9500-30000) began on Aug. 9.8. To date around 270 spectra have been archived, including those from quiescent monitoring from 2011-2021; the observation closest to outburst having been obtained on 2021 Jun. 7.9 (R ~ 940, 3950-7550A) that shows no major changes from the previous two years of monitoring apart from orbital modulation of the Balmer line profiles. Here we focus on the most recent developments. A rich spectrum of permitted Fe-peak second spectrum lines were present from day 3 (taking 2021 Aug. 8.9 for the first epoch, the first photometric and gamma-ray observations to show the outburst, ATel#14834). Narrow Fe II 5169, for instance, was not present after Aug. 19.6 but the broad emission associated with post-shocked gas, [Vrad(max,blue) = -1500 km/s, (=Vrad,(max),red) = +2500 km/s) is both narrower and less symmetric than Hbeta and the higher Balmer lines (on Aug. 20, [-2000,2000]) while the cores of the Balmer line profiles still show wind absorption from the red giant, although it weakened steadily after Aug. 12. The narrow, wind emission is still present on the Fe II lines but the absorption component vanished from all metal lines around Aug. 13.5. One spectrum, with a resolution of 30000, obtained on Aug. 11 shows that although very weak, a vast number of Fe II, Ti II, and related transitions were present at levels varying from 0.1 to 2 relative to the continuum. A comparison with the 2010 Mar. 31 (Day 21) spectrum of V407 Cyg taken at R ~ 67000 with the NOT (Shore et al. 2011, A&A, 527, A98) shows that virtually all of the second spectrum permitted lines (Ti II, Cr II, Fe II, etc) have counterparts in the initial flashed spectrum (see Atel #14860) that are undetectable after approx. Aug. 17. Instead, a wind component, likely powered by the precursor, is growing on the permitted transitions, especially the Balmer and He I lines. The He I profiles are now all composite, like the Balmer transitions, and with similar maximum radial velocities, about 1500 km/s (Aug. 21.8). The O I 7774 and 8446 lines have weakened and narrowed, the 8446 A profile also showing a similar structure to the He I and Balmer lines between [-200,200] km/s; the 7774 A triplet shows a similar narrower emission peak. and development. The narrow component is systematically strengthening relative to the broad, displaced component. [N II] 5755 line has persisted as a narrow (FWZI ~ 130 km/s). It first appeared on Aug. 10 and showed increasing relative intensity through Aug. 21.9 with no evidence of a broad wing. A similarly narrow [Ar III] 7135A line first appeared on Aug. 17. and has been increasing. The [O III] 4363, 4959, 5007A lines, which first appeared on Aug. 17.8 (FWZI ~ 120 km/s) have been steadily increasing, the ratio of the N1/N2 lines is about 1/3, close to the nebular value and suggesting it is from the peripheral parts of the wind. The narrow forbidden lines are situated in the local minimum between the two peaks of He I and similarly for O I 8446, the same was observed during the V407 Cyg eruption due to photoionization. The details of instruments and telescope apertures are provided on the ARAS website (below). Our observations are continuing as weather permits, all spectra are available in FITS files, with previews, through https://aras-database.github.io/database/rsoph.html .
|
2021-08-23 19:31:00
|
optical,gamma ray,nova
|
2021-08-23
|
19:31:00
| 3,640 |
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] | 14,866 |
14,869 |
Erratum to ATel #14867: Discovery of a Probable Nova in M31 or M110
|
K. Hornoch (Astronomical Institute, Ondrejov, Czech Republic)
|
The probable nova reported in ATel #14867 has been identified as very slowly moving minor planet (5234) Sechenov. We apologize for the inconvenience.
We thank J. Zhao for informing us.
|
2021-08-24 00:16:00
|
optical,nova,planet,transient
|
2021-08-24
|
00:16:00
| 185 |
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] | 14,867 |
14,870 |
4U 1730-22 (CXOU J173357.5-220156) was detected in outburst by INTEGRAL for the first time since 1972
|
Sergei A. Grebenev (Space Research Institute, Moscow)
|
A short outburst of the LMXB transient 4U 1730-22 was detected by the IBIS/ISGRI telescope during recent INTEGRAL observations of the Galactic center field. The source has not been active since 1972, when a single ~200 day outburst was detected by the Uhuru satellite (Cominsky et al. 1978; Forman et al. 1978). The origin of the source was recognized by Chandra in 2004 (Tomsick et al. 2007) which detected its quiescent soft X-ray emission (the source CXOU J173357.5-220156) and proved its spectrum to be described by a neutron star atmosphere model with an effective temperature of about 130 eV.
The transient source was first detected (with S/N=7.3) in the IBIS/ISGRI mosaic image measured in the 20-80 keV energy band on August 12-24, 2021. The best fit position of the source, R.A.=263.520 deg, Decl.=-22.022 deg (equinox 2000.0), was 1.8' off that of CXOU J173357.5-220156 (it is within the error box). Our further analysis has shown that the maximum of the source activity was observed between August 12, 20:25 and August 13, 03:17 (UTC) when its mean flux was equal to 31+/-3 mCrab and the confidence of detection was S/N=10.1.
We encourage further observations of this unique transient with a very long quiescent cycle.
|
2021-08-24 06:39:00
|
infra-red,optical,x-ray,neutron star,star,transient,request for observations
|
2021-08-24
|
06:39:00
| 1,231 |
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0.03598691150546074,
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-0.011834939010441303,
0.06253456324338913,
-0.058601342141628265,
-0.09395641088485718,
0.006333037279546261,
-0.08083970099687576,
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0.04481836408376694,
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0.08877687901258469,
-0.09370437264442444,
-0.1320243775844574,
-0.0490182526409626
] | 14,868 |
14,871 |
MAXI/GSC detection of a long X-ray burst from 4U 1820-30
|
M. Serino (AGU), W. Iwakiri (Chuo U.), H. Negoro, M. Nakajima, K. Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa (Tokyo Tech), S. Nakahira, Y. Sugawara, S. Ueno, H. Tomida, M. Ishikawa, M. Tominaga, T. Nagatsuka (JAXA), Y. Ueda, S. Yamada, S. Ogawa, K. Setoguchi, T. Yoshitake, Y. Goto, R. Uematsu (Kyoto U.), H. Tsunemi (Osaka U.), M. Yamauchi, Y. Nonaka, T. Sato, R. Hatsuda, R. Fukuoka (Miyazaki U.), T. Kawamuro (UDP/NAOJ), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC)
|
MAXI/GSC detected a bright X-ray burst from the position consistent with that of the low-mass X-ray binary 4U 1820-30 at 11:27 UT on 2021 August 23. The 4-10 keV X-ray flux averaged over the scan transit assuming a constant flux was 1868 (+104, -94) mCrab (1 sigma error). In the next scan transit at 13:01, the source flux was 486 +- 50 mCrab in the same energy band, which was slightly higher than the persistent level (~200 mCrab). There was no significant excess flux in the previous transit at 09:55 UT. Because a burst like profile was not seen during the scan transit at 11:27, it suggests that the burst had already started before the scan transit at 11:27. Assuming that the persistent emission did not change during the burst, we extracted the spectrum from 4 consecutive scans just before the burst as the persistent emission and included it in the fitting of the burst spectrum extracted from each scan. The absorbed blackbody model fit to the spectra of the first and the second scan transits in the 2-20 keV band gives the blackbody temperature of 2.4 (+0.3, -0.2) keV and 1.6 (+0.5, -0.4) keV, respectively. Here, the hydrogen column density was fixed at 2.7 × 1021 cm-2 (Krim et al. 2009, ATel #2071). Assuming source distance of 7.6 kpc (Kuulkers et al. 2003), the bolometric source luminosity at the first scan was 2.8 (+0.4, -0.3) × 1038 erg/s, which was 74% of empirical Eddington limit for a He type-I X-ray burst (3.8 × 1038 erg/s; Kuulkers et al. 2003). The e-folding decay time calculated from the fluxes of the two scans was about 45 min. Previously, long X-ray bursts with the similar duration from this source were reported in 1999 (Strohmayer & Brown, ApJ, 566, 1045, 2002) and 2010 (in 't Zand et al. 2011, ATel #3625).
|
2021-08-24 20:44:00
|
x-ray,binary,neutron star,star
|
2021-08-24
|
20:44:00
| 1,748 |
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0.06514738500118256
] | 14,869 |
14,872 |
NuSTAR, NICER and optical observation of RS Oph.
|
G. J.M. Luna (IAFE-UBA), R. Jimemez-Carrera (INAF-Padova), T. Enoto (Cluster for Pioneering Research, Riken), J. Mikolajewska (Nucolaus Copernicus Astronomical Center), M. Orio (INAF Padova and University of Wisconsin), N. Ospina (INFN and Padova University), E. Aydi (Michigan State University), J. Carbajo-Hijarrubia (University of Barcelona), K. Gendreau (NASA), Mehara (National Astronomical Observatory of Japan), M. Giese (University of Wisconsin), S. Pei (Padova University)
|
A NuSTAR observation of the recurrent nova RS Oph was obtained on 2021-08-17T03:41:09 until 2021-08-18T03:21:09 (8.2 days after the reported discovery on August 8.93 UT by K. Geary, VSNET alert N.26131). The total, non continuous exposure time was almost 40 kiloseconds. A bright X-ray source is detected in both FPMA and FPMB camera with an average count rate of 14.14+-0.2 c/s in the 3-40 keV energy range. No counts were measured above 40 keV. During the exposure, the count rate decreased smoothly and constantly from 9.02 +- 0.06 c/s to 7.53+-0.05 c/s in the 5-30 keV energy range, while no decrease was not observed in the 3-5 keV energy range. NICER snapshot exposures lasting for a total time of 3840 seconds (observation 4202300108) started 90 minutes earlier than the NuSTAR observation and overlapped with the NuSTAR exposure, detecting the source with an average count rate 151.2+-0.6 counts/s. Three optical spectra were obtained at a time close to the X-ray exposures, starting on 2021-08-16T20:46:08, with the HERMES echelle spectrograph at the MECATOR 1.2 m telescope in the 3800-9000 Angstrom range. Our preliminary fit of NICER+NuSTAR spectra in the 0.2-40 keV range shows that a single temperature plasma (kT~ 5 keV) does not yield an acceptable fit, especially at energies above ~20 keV where the model underestimates the data. A still "tentative", but better fitting model includes an absorbed (N(H)~0.8x10^(22) cm^-2) two-temperatures, collisionally ionized plasma (kT1~4 keV; kT2~12 keV). The total estimated absorbed flux with this model is 8.4 x 10^(-10) erg/cm^2/s, while the unabsorbed flux would be about 1x10^(-9) erg/cm^2/s. However, there are still significant residuals at the lowest energy with this model, in fact the spectrum is altogether very complex and appears to have several different components. While the optical spectra do not indicate a rapid evolution after the SALT spectra described in ATel #14852, the broad absorption component at ~ - 4200 km/s in HI lines disappeared, and two satellite components appeared at about +/-2500 km/s velocity in the H\alpha and H\beta emission line wings. They may be due to a bipolar collimated outflow, similar to the profiles observed during the 2006 outburst ~10-30 days after optical maximum (see Skopal et al., 2008, ASPC, 401, 227). Continued observations will provide information about acceleration or deceleration of these bipolar outflows. We speculate that the complexity of the X-ray spectrum is due to different regions of X-ray emission with different characteristics, possibly a shell and a bipolar outflow like suggested 2006 by Rupen et al. (2008, ApJ, 688, 559) on the basis of radio observations.
|
2021-08-24 23:31:00
|
radio,optical,x-ray,nova
|
2021-08-24
|
23:31:00
| 2,695 |
[
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] | 14,870 |
14,873 |
Erratum for Atel #14872
|
G. J.M. Luna (IAFE-UBA), R. Carrera (INAF-Padova), T. Enoto (Cluster for Pioneering Research, Riken), J. Mikolajewska (Nicolaus Copernicus Astronomical Center), M. Orio (INAF Padova and University of Wisconsin), N. Ospina (INFN and Padova University), E. Aydi (Michigan State University), J. Carbajo-Hijarrubia (University of Barcelona), K. Gendreau (NASA), Hiroyuki Maehara (National Astronomical Observatory of Japan), M. Giese (University of Wisconsin), S. Pei (Padova University)
|
The names of co-authors R. Carrera and H. Maehara were incorrect in the original telegram and also small html code correction were added. A NuSTAR observation of the recurrent nova RS Oph was obtained on 2021-08-17T03:41:09 until 2021-08-18T03:21:09 (8.2 days after the reported discovery on August 8.93 UT by K. Geary, VSNET alert N.26131). The total, non continuous exposure time was almost 40 kiloseconds. A bright X-ray source is detected in both FPMA and FPMB camera with an average count rate of 14.14±0.2 c/s in the 3-40 keV energy range. No counts were measured above 40 keV. During the exposure, the count rate decreased smoothly and constantly from 9.02 ± 0.06 c/s to 7.53±0.05 c/s in the 5-30 keV energy range, while no decrease was not observed in the 3-5 keV energy range. NICER snapshot exposures lasting for a total time of 3840 seconds (observation 4202300108) started 90 minutes earlier than the NuSTAR observation and overlapped with the NuSTAR exposure, detecting the source with an average count rate 151.2±0.6 counts/s. Three optical spectra were obtained at a time close to the X-ray exposures, starting on 2021-08-16T20:46:08, with the HERMES echelle spectrograph at the MECATOR 1.2 m telescope in the 3800-9000 Angstrom range. Our preliminary fit of NICER+NuSTAR spectra in the 0.2-40 keV range shows that a single temperature plasma (kT~ 5 keV) does not yield an acceptable fit, especially at energies above ~20 keV where the model underestimates the data. A still "tentative", but better fitting model includes an absorbed (N(H)~0.8x1022 cm-2) two-temperatures, collisionally ionized plasma (kT1~4 keV; kT2~12 keV). The total estimated absorbed flux with this model is 8.4 x 10-10 erg/cm2/s, while the unabsorbed flux would be about 1x10-9 erg/cm2/s. However, there are still significant residuals at the lowest energy with this model, in fact the spectrum is altogether very complex and appears to have several different components. While the optical spectra do not indicate a rapid evolution after the SALT spectra described in ATel #14852, the broad absorption component at ~ - 4200 km/s in HI lines disappeared, and two satellite components appeared at about ±2500 km/s velocity in the H&alpha and H&beta emission line wings. They may be due to a bipolar collimated outflow, similar to the profiles observed during the 2006 outburst ~10-30 days after optical maximum (see Skopal et al., 2008, ASPC, 401, 227). Continued observations will provide information about acceleration or deceleration of these bipolar outflows. We speculate that the complexity of the X-ray spectrum is due to different regions of X-ray emission with different characteristics, possibly a shell and a bipolar outflow like suggested by Rupen et al. (2008, ApJ, 688, 559) on the basis of radio observations.
|
2021-08-25 06:27:00
|
radio,optical,x-ray,nova
|
2021-08-25
|
06:27:00
| 2,810 |
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] | 14,871 |
14,874 |
Brightening of SS73 141: Outburst of Z And-type?
|
J. Merc (UPJS in Kosice, Charles University), R. Galis (UPJS in Kosice), P. Velez (ARAS Group), S. Charbonnel, O. Garde, P. Le Du, L. Mulato, T. Petit (2SPOT team, ARAS Group)
|
SS73 141 (=WRAY 16-384) is a poorly studied symbiotic star. The optical spectrum of the object, obtained on June 17, 1978, and presented by Allen (1984, PASA, 5, 369) showed prominent TiO bands of late-type giant (later classified as M5 by Murset & Schmid, 1999, A&AS, 137, 473) together with strong emission lines of H I and He II, and relatively faint emission lines of neutral helium.
Recently, Tadashi Kojima (Gunma, Japan) reported a brightening of SS73 141 (see vsnet-alert 26105). In vsnet-alert 26109, Taichi Kato hypothesized, that the ongoing brightening of SS73 141 might be an outburst of a slow symbiotic nova, as opposed to an outburst of classical symbiotic star (Z And-type). For a description of individual types of outbursts observed in symbiotic stars, see, e.g., recent review of symbiotic stars by Munari (2019, arXiv:1909.01389).
According to recent ASAS-SN light curve (Shappee et al., 2014, ApJ 788, 48; Kochanek et al., 2017, PASP, 129, 104502), the outburst started at the beginning of May 2021 and the brightness reached the maximum in the middle of July (around g = 13.4). The median magnitude of the object before the outburst was g ~ 15 resulting in the amplitude of the outburst of 1.6 mag (in g). Since the middle of July, the brightness has remained more or less constant. No previous brightenings are seen in the ASAS-SN light curve nor are reported in the literature (up to our knowledge), making the ongoing brightening the first recorded outburst of SS73 141.
We obtained two low-resolution optical spectra of the object at JD 2 459 451.47 (August 25, 2021) and JD 2 459 452.24 (August 26, 2021). They cover the wavelength range of 4000-5639 A and 3900-7802 A, respectively. The spectra revealed the Balmer lines in emission, together with several faint emission lines of neutral helium. Emission lines with higher ionization potential (e.g., He II) are not detected in our spectra. TiO bands are rather weak, especially when compared with the spectrum presented by Allen (1984).
Such behavior and spectral appearance are often observed during Z And-type outbursts (see, e.g., Figure 6.4 in Munari, 2019). In response to the expansion of the burning shell of the hot component, its temperature drops and emission lines with a high ionization potential disappear from the spectra. At the same time, the rising blue continuum partially obscures the continuum radiation from the giant, causing the diminishing of the TiO bands. The photometric behavior of SS73 141 also seems to point to the outburst of Z And-type. The amplitude of the outburst (1.6 mag) and its timescale (rise to the maximum took around 80 days) are more typical for Z And-type outbursts. Their typical amplitudes are about 1-3 mag in B, with amplitude decreasing towards red. Slow symbiotic novae have typically much larger amplitudes and the rise to the maximum is taking ~1 year or more.
It is definitely worth monitoring this target in the following months to confirm or reject the Z And-type classification. The spectra used in this report are available in the ARAS Database (Teyssier, 2019, CAOSP, 49, 217).
|
2021-08-27 01:58:00
|
infra-red,optical,binary,nova,star,transient,variables
|
2021-08-27
|
01:58:00
| 3,122 |
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] | 14,872 |
14,875 |
SPT-210826 - South Pole Telescope Begins Public Alert System, Reports Detection of a Millimeter-Band Flaring Source
|
Allen Foster (CWRU), Sam Guns (UC Berkeley), SPT-3G Collaboration
|
The South Pole Telescope Collaboration reports: The 3rd-generation receiver on the South Pole Telescope (SPT-3G) detects a flaring millimeter point source at RA = 15.10494d, DEC = -43.95403d (estimated positional uncertainty of 15 arcseconds). Detectable emission began in the week of June 20 2021, with a global detection significance of ~6.8 sigma and continues to rise in week-long averages with a current significance of ~8.8 sigma. Peak emission is currently (as of the most recent week ending on Aug 23rd) 13.2 +/- 1.9 mJy (95 GHz), and 12.2 +/- 2.2 mJy (150 GHz). At the time of this alert, emission from this source is rising. SPT-3G will continue to monitor this source at hour- to day-long intervals. Average quiescent flux at this position in 2020 measured via SPT-3G is 5.7 +/- 0.5 mJy (95 GHz), and 5.0 +/- 0.6 mJy (150 GHz) suggesting a factor of 2 increase in millimeter-band luminosity. This source may be associated with SPT-SJ010023-4357.1, which is located at a distance of 15 arcseconds from the SPT-3G source and measured by SPT-SZ to have average flux densities 7.3 +/- 2.3 mJy (95 GHz) and 5.1 +/- 1.4 mJy (150 GHz) between Sept 2010 and October 2011. There is also a nearby (~2 arcseconds) quasar candidate source XMMSL2 J010025.1-435716/WISEA J010025.17-435713.5. All flux calibrations quoted here are preliminary and are believed to be accurate to 20%. Further information including lightcurves and an updated catalog of SPT transient detections can be found at https://pole.uchicago.edu/public/data/transients/. The South Pole Telescope is a 10-meter telescope designed for observations of the cosmic microwave background located at Amundsen-Scott South Pole Station and supported by the National Science Foundation and the US Dept. of Energy. The SPT online transient program providing data in this telegram is supported by NSF grants AST-1716965 and OPP 1852617, and observes 1500 square degrees of the southern sky at 95, 150, and 220 GHz with an average revisit cadence of 12 hours. For more details on the SPT transient program and survey strategy, please see https://arxiv.org/abs/2103.06166.
|
2021-08-27 05:11:00
|
millimeter,agn,quasar,transient
|
2021-08-27
|
05:11:00
| 2,125 |
[
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] | 14,873 |
14,876 |
Small Apparent Outburst of Comet 120P/Mueller 1
|
Michael S. P. Kelley (U. Maryland) on behalf of the Zwicky Transient Facility Collaboration
|
We report an apparent outburst of comet 120P/Mueller 1 discovered in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) photometry, measured in 7" radius apertures and calibrated to the PS1 photometric system. On 2021 Aug 01 at 11:33 UTC, the comet had an apparent r-band magnitude of 20.5+/-0.3 mag. The comet brightened to r=19.08+/-0.08 mag by the next set of data taken Aug 08 at 11:38 UTC. The outburst was subsequently confirmed on Aug 09 at 11:38 UTC, when the comet had a brightness of r=19.14+/-0.10 mag. The 7" radius aperture encompasses the full extent of the ejecta in the first post-outburst image. Altogether, the apparent outburst had a strength of -1.4+/-0.3 mag. The comet was at 2.55 au from the Sun and 3.00 au from the Earth.
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, Weizmann Institute for Science, Oskar Klein Center at Stockholm University, University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, TANGO Consortium of Taiwan, University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
|
2021-08-27 05:37:00
|
optical,comet,the sun,transient
|
2021-08-27
|
05:37:00
| 1,405 |
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] | 14,874 |
14,877 |
Small Apparent Outburst of Comet 241P/LINEAR
|
Michael S. P. Kelley (U. Maryland), Kritti Sharma (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA) on behalf of the Zwicky Transient Facility Collaboration and GROWTH India Collaboration
|
We report an apparent outburst of comet 241P/LINEAR discovered in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) photometry, as measured in 5" radius apertures and calibrated to the PS1 photometric system. On 2021 Aug 10 at 11:41 UTC, the comet had an apparent r-band brightness of 18.31+/-0.05 mag. The comet brightened to r=17.86+/-0.04 mag by the next set of data taken Aug 12 at 11:42 UTC. The outburst was subsequently confirmed with the 0.7-m GROWTH India Telescope on Aug 12 at 22:16 UTC, when the comet had a brightness of r=17.85+/-0.06 mag. The 5" radius aperture encompasses the full extent of the ejecta in the first post-outburst image. Altogether, the apparent outburst had a strength of -0.45+/-0.06 mag. The comet was at 1.93 au from the Sun and 2.42 au from the Earth.
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and a collaboration including Caltech, IPAC, Weizmann Institute for Science, Oskar Klein Center at Stockholm University, University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, TANGO Consortium of Taiwan, University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics and the Indian Institute of Technology Bombay with support from the Indo-US Science and Technology Forum (IUSSTF) and the Science and Engineering Research Board (SERB) of the Department of Science and Technology (DST), Government of India (https://sites.google.com/view/growthindia/). It is located at the Indian Astronomical Observatory (Hanle), operated by the Indian Institute of Astrophysics (IIA).
|
2021-08-27 05:40:00
|
optical,comet,the sun,transient
|
2021-08-27
|
05:40:00
| 1,986 |
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] | 14,875 |
14,878 |
Radio brightening of the transient black hole 4U 1543-47 as seen with MeerKAT
|
Xian Zhang, Wenfei Yu (Shanghai Astronomical Observatory), Rob Fender (University of Oxford), Patrick Woudt (University of Cape Town), James Miller-Jones (Curtin University), Sara Motta (INAF-OAB & University of Oxford), on behalf of the ThunderKAT collaboration
|
After ~ 17 years of quiescence, the black hole X-ray binary 4U 1543-47 was found in an X-ray outburst by MAXI/GSC on June 11, 2021 (ATel #14701). It probably went through a very fast hard-to-soft spectral state transition in the same day. Since then, the source has been residing in the soft spectral state (ATel #14701, #14708, #14725, #14749).
As part of the ThunderKAT Large Survey Programme (Fender et al. 2017, arXiv:1711.04132), we started to monitor 4U 1543-47 on a weekly basis with the MeerKAT telescope since June 19. Each observation consists of an on-source exposure time of ~ 15 minutes. J1939-6342 has been used as the bandpass and flux density calibrator while J1501-3918 as the phase calibrator throughout our monitoring. On August 22, 4U 1543-47 was detected with a flux density of 14.45 +/- 0.06 mJy at 1.284GHz based on our preliminary measurements. This was the first detection of radio emission from this source after nearly one month of non-detection since July 26. This indicates a radio brightening of 4U 1543-47. We encourage multi-wavelength follow-up observations of the source.
ThunderKAT will run for 5 years and targets X-ray binaries, Cataclysmic Variables, Supernovae and Gamma-Ray Bursts. As part of this programme we perform weekly monitoring observations of all bright, active, southern hemisphere X-ray binaries in the radio band. For further information on this programme please contact Rob Fender and/or Patrick Woudt.
We thank the staff at the South African Radio Astronomy Observatory (SARAO) for their rapid scheduling of these observations. The MeerKAT telescope is operated by SARAO, which is a facility of the National Research Foundation, an agency of the Department of Science and Technology.
|
2021-08-28 00:15:00
|
radio,x-ray,gamma ray,binary,black hole,cataclysmic variable,gamma-ray burst,supernovae,transient,variables
|
2021-08-28
|
00:15:00
| 1,741 |
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] | 14,876 |
14,879 |
ASASSN-21qj: A Rapidly Fading, Sun-Like Star
|
M. Rizzo Smith, T. Jayasinghe, K. Z. Stanek, C. S. Kochanek, D. M. Rowan, C. Christy, T. A. Thompson (OSU), B. J. Shappee (Univ. of Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus)
|
During the ongoing All-Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014, Kochanek et al. 2017), using data from the quadruple 14-cm ``Cassius'', ``Payne-Gaposchkin'', and ``Paczynski'' telescopes, we identified a stellar source undergoing a deep dimming episode. The source ASASSN-21qj (Gaia EDR3 source 5539970601632026752 at RA=08:15:23.2996, DEC=-38:59:23.304, d~556 pc, G=13.4 mag, BP-RP=0.8 mag) is classified as a Sun-like star in the Gaia DR catalog (R=1.03 R_Sun; L=1.1 L_Sun). It was first observed by ASAS-SN on UT 2012-02-09. Presently, ASASSN-21qj has more than ~2800 data points.
ASASSN-21qj has a quiescent mean magnitude of g~13.8 (V~13.4). The latest ASAS-SN photometry shows that ASASSN-21qj was at g~14.2 before becoming Sun constrained on UT 2021-06-29. When the star was again observable on UT 2021-08-26, it had dimmed significantly to g~15.3. As of UT 2021-08-27 ASASSN-21qj is at g~16.0 and appears to still be fading. There were no similar episodes over the previous ~2000 days spanned by the full ASAS-SN light curve.
Follow-up observations of this very unusual object are strongly encouraged.
We thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501 to the Ohio State University, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, and the Chinese Academy of Sciences South America Center for Astronomy (CASSACA).
|
2021-08-28 01:42:00
|
optical,star,supernovae,the sun,variables
|
2021-08-28
|
01:42:00
| 1,570 |
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] | 14,877 |
14,880 |
SOAR spectroscopic classification of Gaia21dyi as a highly reddened classical nova
|
E. Aydi, K. V. Sokolovsky, A. Kawash, J. Strader, L. Chomiuk (MSU)
|
We report on spectroscopic follow up of the optical transient Gaia21dyi discovered on 2021-08-22.42 UT at a magnitude G = 14.86. Gaia21dyi was suggested to be a reddened classical nova by Taichi Kato [vsnet-alert 26177]. There is also a potential detection of the transient by the All-Sky Automated Survey for SNe (ASAS-SN, Shappee et al. 2014, ApJ, 788, 48) on 2021-08-23.9 at g = 16.93.
On 2021-08-28.1 we obtained low- and medium-resolution spectra with the Goodman spectrograph (Clemens et al. 2004, SPIE, 5492, 331) on the 4.1 m SOAR telescope. The spectra show a red continuum with emission lines of Balmer, O I, Na I, N II, He I, and [NII]. Halpha is characterized by a double peaked emission and a P Cygni profile with absorption trough at a blueshifted velocity of around 2300 km/s relative to the line center. The spectrum is that of a highly reddened classical nova, possibly after optical peak.
We constrain the coordinates of the nova based on the SOAR images to RA = 17:26:19.382 and Dec = -33:27:10.66 (ICRS), consistent with the Gaia reported position.
This ATel is based on observations obtained at the Southern Astrophysical Research (SOAR) telescope, which is a joint project of the Ministerio da Ciencia, Tecnologia, Inovacoes e Comunicacoes do Brasil (MCTIC/LNA), the U.S. National Science Foundation's National Optical Astronomy Observatory (NOAO), the University of North Carolina at Chapel Hill (UNC), and Michigan State University (MSU).
|
2021-08-28 17:03:00
|
optical,nova,transient
|
2021-08-28
|
17:03:00
| 1,465 |
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0.052869126200675964,
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] | 14,878 |
14,881 |
Continuing ARAS Group spectroscopic monitoring of RS Oph: appearance of high ionization lines
|
S. N. Shore (Univ. of Pisa), F. Teyssier, O. Thizy (ARAS Group)
|
This is an update on the continuing spectroscopic monitoring of RS Oph by the ARAS group medium resolution (resolution above 9000, covering around 3900 to 8900A). Here we report only recent results from the echelle spectra. A large number of lower resolution, from about 200 to 1500, are also being accumulated (ATel#14868 and cited previous). The details of instruments and telescope apertures are provided on the website (https://aras-database.github.io/database/rsoph.html). For comparison, see https://ui.adsabs.harvard.edu/abs/2008ASPC..401.....E/abstract for an overview of the 2006 outburst. All absorption has now vanished around Aug 25.0 from the Balmer profiles, the narrow wind P Cyg absorption at -36 km/s now shows weak, narrow emission on Halpha. The Halpha profile also shows a weak, extended wing to \vrad| ~ 3000 km/s with the maximum |vrad| ~ 2000 km/s at about twice the continuum level.; the line profile is steeper on the blue side. He II 4686, 5411 are both present, HWZI ~ 1000 km/s and symmetric profiles. This contrasts with the He I profiles, especially 6678, that show an emission peak at +230 km/s; this is also present on the Balmer lines, O I 7774, 8446, and is different from the [N II] 5755 peak (-37 km/s). This peak is not present on either optical He II profile or N III 4636A, which is now stronger than He II 4686. [Fe VI] 5276 shows a narrow feature, like [N II] and at -44 km/s, as does [Fe VII] 6087; the latter also appears to show a broader feature with maximum |vrad| ~ 640 km/s (HWZI) . The narrow component may have been present as early as Aug. 17. [Fe VII] 5720 may also show a weak narrow component after Aug. 25. If due to photoionization, it indicates flux at or above about 0.1 KeV so there may already be a strong soft source that is simply too absorbed by the still mainly neutral wind to be directly detectable. [Fe VI] 5276 may also have been present earlier but was more likely Fe II 5275. [Ar III] 7135 is likely present as a very weak, similarly narrow feature as early as Aug. 17.
|
2021-08-28 20:30:00
|
optical,nova
|
2021-08-28
|
20:30:00
| 2,039 |
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] | 14,879 |
14,882 |
AstroSat X-ray Observations of Recurrent Nova RS Oph
|
Sandeep K. Rout, Mudit K. Srivastava, Dipankar P. K. Banerjee, Santosh Vadawale, Vishal Joshi and Vipin Kumar, Astronomy and Astrophysics Division, Physical Research Laboratory (PRL), Ahmedabad, 380009, India
|
We report AstroSat observations of recurrent nova RS Oph (ATel# 14834, ATel# 14838, ATel# 14840, ATel# 14844, ATel# 14845, ATel# 14846, ATel# 14848, ATel# 14849, ATel# 14850, ATel# 14851, ATel# 14852, ATel# 14855, ATel# 14857, ATel# 14858, ATel# 14860, ATel# 14863, ATel# 14864, ATel# 14866, ATel# 14868, ATel# 14872, and ATel# 14873). RS Oph was observed with LAXPC (Yadav et al. 2016, ApJ, 833, 27) and SXT instruments (Singh et al. 2016, SPIE, 99051E) on 2021-08-14.60 UTC, 2021-08-16.02 UTC, 2021-08-21.12 UTC, and 2021-08-22.18 UTC i.e. 5.67, 7.09, 12.19 and 13.25 days after the outburst (August 8.93 UT, K. Geary, VSNET alert N.26131). The exposure times for LAXPC and SXT were in the range of 7000 seconds and 4000 seconds respectively.
The LAXPC (3-15 KeV) and SXT (1-7 KeV) spectra of all the epochs were fitted with an absorbed single-temperature collisionally ionized diffused plasma. The model provides slightly unsatisfactory fits for 14 and 16 August spectra and possibly requires another low temperature component at ~ 0.1 keV (also noticed while fitting the joint NICER and NuSTAR data, Luna et al. ATel #14872/ATel# 14873). The 0.5-20 keV unabsorbed X-ray flux has dropped from 18.5 X 10^{-10} erg/s/cm^2 to 8.0 X 10^{-10} erg/s/cm^2 from 14 to 22 August. The corresponding plasma temperatures were determined to be 6.6 keV, 5.2 keV, 3.0 keV and 2.6 keV for 14, 16, 21 and 22 August respectively. The Fe line at approximately 6.5 keV is clearly visible in the 14 and 16 Aug spectra, which loses its strength on 21 and 22 August.
The trend for the drop in X-ray flux, plasma temperature as well as the evolution of the X-ray spectra are very similar to that observed in the 2006 outburst of RS Oph (Sokoloski et al. 2006, Nature, 442, 276â278). The super-soft X-ray phase of RS Oph in the 2006 outburst commenced ~26 days after the outburst (Osborne et al., 2011, ApJ, 727, 124). If we expect the same trend, this phase would begin soon. However, due to technical observing constraints of the AstroSat mission for RS Oph, it is likely that the super-soft phase will not be observable by AstroSat except during a brief window in beginning-mid October, 2021. Simultaneous ultra-violet observations (~1300-1800A FUV spectroscopy) were also attempted on 21-22 August, but data is yet to be processed.
|
2021-08-28 23:32:00
|
infra-red,ultra-violet,x-ray,nova
|
2021-08-28
|
23:32:00
| 2,317 |
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] | 14,880 |
14,883 |
ARAS Group monitoring of RS Oph 2021: Rapid profile variations of He II detected
|
S. N. Shore (Univ. of Pisa), F. Teyssier, J. Guarro, H. Allen, V. Lecocq, K. Shank, P. Velez (ARAS Group)
|
In the last two days the He II 4686,5411A lines have dramatically altered in both strength and profile, detected with optical grating and echelle spectra (observers and nstruments are available at the ARAS Database website). As reported in ATel#14881, on Aug. 25.8 both lines were present with roughly symmetric profiles and |vrad,max| ~ -1100 km/s. On Aug. 26.8 the profiles were similar but about 1/2 the previous normalized flux. The profile now, Aug. 28.8, has < 1/10 the relative intensity and virtually no emission associated with the component centered at +270 km/s (+10 < vrad < 1300 km/s). Notably, the fine structure peaks on all He I profiles at around -240 km/s and -20 km/s are also present on He II and its blue wing extends to vrad ~ -1200 km/s, like He I (the wing of Hbeta extends to -2200 km/s). In this same time period, the O I 7772 A component shows emission confined to the same velocity interval as the He II emission deficit, although O I 8446 A shows a similar profile to the other permitted lines, including e.g., Fe II 5018, 5169 A. Although weakened in relative flux, N III 4636 has otherwise not changed from our previous observations. The only significant structural change is in the ionized He profiles. We urge continued, high cadence spectroscopic monitoring; all spectra described here are available through the ARAS database.
|
2021-08-29 08:36:00
|
optical,nova
|
2021-08-29
|
08:36:00
| 1,360 |
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] | 14,881 |
14,884 |
Swift observations and continued spectroscopy/photometry of nova V5856 Sgr trapped in persistent nuclear burning five years past the 2016 outburst
|
U. Munari (INAF Padova), N. Masetti (INAF-OAS Bologna), F. M. Walter (Stony Brook Univ.) R. E. Williams (STScI and UCSC), P. Valisa and S. Dallaporta (ANS Collaboration)
|
We have reported earlier (Munari et al. ATel #14804) about Nova V5856 Sgr (= ASASSN-16ma = Nova Sgr 2016 N.4) that in July 2021 we found to be still 9 mag brighter than quiescence five years past the initial outburst, suggesting it is continuing to burn at the surface of the WD. The nova erupted on 2016 October 25 (Stanek et al. 2016, ATel #9669), and was remarkable for the strong emission in gamma-rays recorded by Fermi-LAT (Li et al. 2017, NatAs 1, 697) and its tight correlation with the behavior at optical wavelengths (Munari et al. 2017, MNRAS 469, 4341). The ASASSN light-curve (Shappee et al. 2014, ApJ 788, 48; Kochanek et al. 2017, PASP 129, 104502) shows that around mid-2017 the nova drastically reduced its rate of decline, losing only about 1 mag since then.
We are continuing to collect UBVRI photometry of the nova with the ANS Collaboration telescope ID 0310, low resolution spectroscopy with the Asiago 1.22m telescope and Echelle spectroscopy with the Varese 0.84m telescope. The nova has remained highly stable through July and August 2021, maintaining the spectral appearance already described in ATel #14804 and with constant brightness around the mean values (on the Landolt system):
As part of an ongoing monitoring, an Echelle spectrum of the nova was obtained with Chiron high resolution spectrograph on the SMARTS/CTIO 1.5m telescope on 2021 Jul 29, at a higher dispersion and S/N compared to the Varese 0.84m Echelle spectra. The Chiron spectrum confirms that permitted emission lines are composed of a trapezoidal broad pedestal (900 km/s wide at the top, 1500 km/s at the bottom) with superimposed a prominent narrow central spike (FWHM: 60 to 100 km/s) flanked by a narrow absorption (FWHM: 35 to 50 km/s) blue-shifted by 30 to 60 km/s from the narrow emission. The forbidden lines are characterized by a trapezoidal profile slightly wider than for permitted lines (1700 km/s at the base and 1100 km/s at the top) and a much weaker central spike.
Starting at 02:28 UT of 2021 August 25 the source was observed in X-rays and ultraviolet with the instruments XRT and UVOT onboard the Neil Gehrels Swift satellite. The three UVOT filters UVW1, UVM2 and UVW2 were used, with exposure times 431 s, 382 s and 382 s, respectively; V5856 Sgr was detected in all bands at Vega system magnitudes UVW1=13.36+-0.04, UVM2=14.12+-0.04 and UVW2=13.87+-0.04. The simultaneous 1200s XRT observation failed to detect the target, with a 3-sigma limit of 7.6e-3 counts/s (0.3-10~keV)
Assuming a distance d=6.5 kpc and a color excess E(B-V)=0.35 mag (Munari et al. 2017, MNRAS 469, 4341), the energy radiated by the nova over the UVOT and UBVRI photometric bands is 700 Lsun (2.7e36 erg/s). The upper limit to the X-ray luminosity over the 0.3-10 keV range is 0.5 Lsun (1.8e33 erg/s), assuming a bremsstrahlung spectrum with temperature kT=1 keV and a hydrogen column density 2e21 atoms/cm2 (corresponding to the interstellar reddening following the prescription of Predehl & Schmitt 1995, A&A 293, 889). The sustained wind blowing off the WD appears therefore thick enough to absorb locally the X-rays generated by the protracted burning on the surface of the WD.
|
2021-08-30 15:46:00
|
optical,ultra-violet,x-ray,gamma ray,nova
|
2021-08-30
|
15:46:00
| 3,182 |
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] | 14,882 |
14,885 |
Possible start of the supersoft source phase in RS Oph
|
K. L. Page (U. Leicester)
|
The Neil Gehrels Swift Observatory has been observing RS Oph approximately daily since the announcement of the latest eruption on 2021 August 08 (K. Geary; vsnet-alert 26131). The nova has been widely followed and detected across the electromagnetic spectrum, from gamma-rays and X-rays (ATels #14834, #14844, #14845, #14846, #14850, #14855, #14857, #14864, #14872, #14873, #14882) to infrared and optical (ATels #14838, #14840, #14852, #14858, #14860, #14863, #14866, #14868, #14881, #14883) to radio (ATel #14849). IceCube also checked for coincident neutrinos, though none was found (ATel #14851).
Following the first two Swift observations between which the X-rays were seen to brighten (ATel #14848), the X-ray count rate continued to increase, reaching a maximum of ~16 count s-1 around six days after the optical peak (estimated to be 2021 August 09 from AAVSO data). Following a three day gap in Swift observations due to the Moon observing constraint, the count rate was found to have decreased, to ~14 count s-1. Since this time, the fading in X-rays has been very gradual, with the count rate currently (August 30; day 20) around 9-10 count s-1.
The two snapshots of data collected on 2021 August 30 both show a slight increase in the soft counts below 0.6 keV. While there has been a steady decrease in the absorbing column required to fit the X-ray data (as expected, as the shock expands through the red giant companion; Sokoloski et al., 2006 Nature, 422, 276; Bode et al., 2006, ApJ, 652, 629), leading to an overall softening, the shape of these latest spectra is different, suggesting the appearance of a new soft component. While this apparent soft excess is only weak, we suggest it may be the beginning of the supersoft source phase, which was seen to be highly variable following the 2006 eruption of RS Oph (Osborne et al., 2011, ApJ, 727, 124).
Regular monitoring by Swift will continue, and we encourage observations at other wavelengths.
We thank the Swift PI and his deputies for approving these observations, as well as the science operations team for implementing them.
|
2021-08-30 20:35:00
|
radio,optical,x-ray,gamma ray,neutrinos,nova,variables
|
2021-08-30
|
20:35:00
| 2,102 |
[
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] | 14,883 |
14,886 |
VLA observations of the 2021 eruption of RS Oph
|
Kirill Sokolovsky, Elias Aydi, Laura Chomiuk, Adam Kawash, Jay Strader (MSU), Aliya-Nur Babul, Jennifer Sokoloski (Columbia), Amy Mioduszewski, Justin Linford (NRAO), Koji Mukai (NASA/GSFC), Kwan-Lok Li (NCKU), Tim O'Brien (JBCA/Manchester), Michael Rupen (NRC)
|
The 2021 eruption of the recurrent nova RS Oph was discovered on 2021-08-08 by Keith Geary, Alexandre Amorim and Eddy Muyllaert (AAVSO Alert Notice 752). The pre-discovery observations reported to the AAVSO by Bin Wang indicate the outburst started shortly before 2021-08-08 13:47 UT (t0). The eruption has been seen across the electromagnetic spectrum from radio (ATel #14849) to X-rays (ATel #14846, #14848, #14850, #14855, #14864, #14872, #14882) and gamma-rays of GeV (ATel #14834, #14845) and, for the first time, TeV energies (ATel #14844, #14857). It continues to be intensively followed spectroscopically in the optical and infrared bands (ATel #14838, #14840, #14852, #14858, #14860, #14863, #14866, #14868, #14881, #14883). The search for neutrino emission with IceCube was negative (ATel #14851).
We used the Karl G. Jansky Very Large Array (VLA) to obtain radio spectra of RS Oph in the 2.6 - 35 GHz frequency range. The first observation on 2021-08-13 (t0 + 4.5 d) revealed an inverted spectrum (positively defined spectral index a = 0.8 +/-0.1) with flux densities rising from 4.7 mJy at 2.6 GHz to 38 mJy at 35 GHz. The radio emission became brighter and softer in the following days reaching 92 mJy at 2.6 GHz, 48 mJy at 35 GHz (a = -0.3 +/-0.1) by 2021-08-25 (t0 + 16.5 d). The uncertainties are dominated by the VLA flux density scale calibration accuracy expected to be ~15% at 35 GHz and 5% at lower frequencies. We used 3C286 as the primary flux density calibrator. Phase-only self-calibration was applied before measuring the source flux density by fitting a point source model to the uv-data. The VLA was in its fairly compact C configuration with the maximum baseline of 3.4 km.
Assuming the Gaia distance of 2.7kpc and the expansion velocity of 3000 km/s (ATel #14881), the observed flux densities correspond to the brightness temperatures of 10^8 K at 2.6 GHz and 10^6 K at 35 GHz, suggesting that the observed radio emission is largely nonthermal. The external free-free absorption or the synchrotron self-absorption within the radio emitting region resulted in the inverted spectrum shape observed early in the eruption. A nearly flat spectrum (a = -0.3) together with deviations from a simple power law fit are observed at later times. This indicates that while the absorption has mostly cleared, the emitting region is inhomogeneous or remains partly hidden behind an inhomogeneous absorbing screen.
The observations reported here were obtained with the National Radio Astronomy Observatory's Karl G. Jansky Very Large Array. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.
|
2021-08-31 12:55:00
|
radio,optical,x-ray,gamma ray,tev,neutrinos,nova
|
2021-08-31
|
12:55:00
| 2,718 |
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] | 14,884 |
14,887 |
Swift J1555.2-5402 : More SGR bursts seen by BAT
|
David Palmer (LANL) on behalf of the Swift BAT team
|
Swift-BAT continues to detect bursts from the Soft Gamma Repeater Swift J1555.2-5402
Including those previously reported (ATel #14690, GCN #30296, GCN #30711, etc.) the catalog of bursts imaged and located by Swift BAT is shown here.
Burst time(UT corrected) TriggerDur(s) Fluence(crab-secs) 2021-06-03 09:45:460.0080.42 ± 0.04 2021-06-05 23:52:040.0160.30 ± 0.04 2021-06-07 12:33:400.0040.11 ± 0.02 2021-06-13 06:35:220.0080.18 ± 0.03 2021-06-16 14:44:300.0080.23 ± 0.03 2021-06-21 17:04:360.0080.19 ± 0.02 2021-07-04 09:45:010.0320.52 ± 0.07 2021-07-16 16:22:130.0160.48 ± 0.07 2021-07-29 21:34:250.0080.15 ± 0.02 2021-08-05 12:34:230.0040.11 ± 0.02 2021-08-25 06:53:270.0160.86 ± 0.08 2021-08-27 05:20:490.0080.49 ± 0.05 2021-08-27 06:54:580.0080.15 ± 0.03 2021-08-29 19:18:070.0080.49 ± 0.06
All values are produced by the on-board imaging system and have not been refined on the ground. They should be considered qualitative values for comparison between BAT bursts.
Trigger duration is an indirect, binary-quantized approximation of T90.
Fluence in Crab Seconds (15-50 keV) is extracted from the image made during the trigger interval and has large systematic errors.
This ATel is an official product of the Swift Team.
|
2021-08-31 23:43:00
|
x-ray,gamma ray,binary,magnetar,soft gamma-ray repeater
|
2021-08-31
|
23:43:00
| 1,231 |
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] | 14,885 |
14,888 |
INTEGRAL hard X-ray observations of 4U 1543-47
|
V. Sguera (INAF-OAS Bologna, Italy), L. Sidoli (INAF-IASF Milano, Italy)
|
4U 1543-47 is a black hole x-ray binary which has been found in a new X-ray outburst activity by MAXI/GSC on June 11 (ATel #14701). Since then, subsequent multi-band follow-up observations have been performed (ATels #14708, #14715, #14719, #14721, #14725, #14749, #14795). Recently, MeerKAT detected a radio brightening from the source on August 22 (ATel #14878).
|
2021-09-01 21:44:00
|
radio,x-ray,binary,black hole,transient
|
2021-09-01
|
21:44:00
| 363 |
[
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] | 14,886 |
14,889 |
Swift follow-up observations of the blazar PKS 0420-014
|
F. D'Ammando (INAF-IRA Bologna)
|
Following the mm/sub-mm flaring activity from the flat spectrum radio quasar PKS 0420-014 observed by ALMA on 2021 August (see ATel #14847), Swift target of opportunity observations were performed on 2021 August 17, 25, and 31.
Taking into consideration the Swift observations performed during 2007-2021, the source reached on 2021 August 31 the highest count rate observed in the 0.3-10 keV energy range (see Swift-XRT Monitoring of Fermi-LAT Sources of Interest). Swift/XRT data were taken in Photon Counting mode for a net exposure of about 2.2 ksec, 1.8 ksec, and 1.4 ksec on 2021 August 17, 25, and 31, respectively. The X-ray spectrum (0.3-10 keV) of PKS 0420-014 can be fit by an absorbed power-law model with an HI column density consistent with the Galactic value in the direction of the source (n_H = 8.6 x 10^20 cm^-2; Ben Bekhti et al. 2016, A&A, 594, A116) and a photon index of 1.60 +/- 0.11, 1.56 +/- 0.13, and 1.49 +/- 0.15, respectively. The corresponding observed 0.3-10 keV fluxes are (10.0 +/- 0.6)e-12, (10.8 +/- 0.7)e-12, and (12.9 +/- 1.3)e-12 erg cm^-2 s^-1, respectively. By comparison, the flux estimated in the previous XRT observations of PKS 0420-014 ranges between (1.9-6.8)e-12 erg cm^-2 s^-1, indicating a clear increase of X-ray activity in 2021 August, in agreement with the observed mm/sub-mm flaring activity.
In consideration of the ongoing activity of this source, confirmed also by the Swift-XRT observations, we encourage further multi-wavelength observations.
We would like to thank the Swift Team, Observatory Duty Scientists, and PI for making these observations possible.
|
2021-09-02 22:59:00
|
radio,x-ray,agn,black hole,blazar,quasar
|
2021-09-02
|
22:59:00
| 1,618 |
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] | 14,887 |
14,890 |
Discovery of 9 ASAS-SN Supernova Candidates
|
J. Brimacombe (Coral Towers Observatory), G. Bock (Runaway Bay Observatory, Australia), B. Nicholls (Mt. Vernon Obs., New Zealand), P. Vallely, K. Z. Stanek, C. S. Kochanek, C. Christy, M. Rizzo Smith, S. Bose, T. A. Thompson (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong (KIAA-PKU), M. Stritzinger (Aarhus)
|
During the ongoing All Sky Automated Survey for SuperNovae (ASAS-SN, Shappee et al. 2014), using data from the quadruple 14-cm "Brutus" telescope in Haleakala, Hawaii, the quadruple 14-cm "Leavitt" telescope in Fort Davis, Texas, the quadruple 14-cm "Payne-Gaposchkin" telescope in Sutherland, South Africa, and the quadruple 14-cm "Cassius" and "Paczynski" telescopes in Cerro Tololo, Chile, we discovered several new transient sources. Properties of the supernovae, as well as associated finding charts showing the archival imaging (left) and the follow-up confirmation image (right) are included in the table below:
Follow-up observations are encouraged.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-21xx transient names as our primary nomenclature (including supernovae, but also other classes of transients), and we encourage others to do the same. We prefer merging the names as ASASSN-21xx (AT 2021xyz) to preserve, rather than anonymize, the origin of the transient.
We would like to thank Las Cumbres Observatory and its staff for their continued support of ASAS-SN. ASAS-SN is funded in part by the Gordon and Betty Moore Foundation through grants GBMF5490 and GBMF10501, NSF grant AST-1908570, the Mt. Cuba Astronomical Foundation, the Center for Cosmology and AstroParticle Physics (CCAPP) at OSU, the Chinese Academy of Sciences South America Center for Astronomy (CASSACA), and the Villum Fonden (Denmark). For more information about the ASAS-SN project, see the ASAS-SN Homepage and the list of all ASAS-SN transients.
|
2021-09-04 02:31:00
|
optical,supernovae,transient
|
2021-09-04
|
02:31:00
| 1,604 |
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] | 14,888 |
14,891 |
SPT-210903 - South Pole Telescope Reports Detection of a Millimeter-Band Flaring Source
|
Sam Guns, Allen Foster, SPT-3G Collaboration
|
The South Pole Telescope Collaboration reports: The 3rd-generation receiver on the South Pole Telescope (SPT-3G) detects a flaring millimeter point source at RA = 355.21397d, DEC = -43.11194d (estimated positional uncertainty of 15 arcseconds). Detectable emission began in the week of July 26 2021, rising steadily and reaching a peak of 14.7 ± 3.4 mJy at 95 GHz, 12.8 ± 4.0 mJy at 150 GHz, and 37.5 ± 15.9 mJy at 220GHz on August 26. SPT-3G will continue to monitor this source at hour- to day-long intervals. Average quiescent flux at this position in 2020 measured via SPT-3G is 0.9 ± 0.5 mJy (95 GHz), 1.0 ± 0.6 mJy (150 GHz) and 4.9 ± 2.1 mJy (220GHz) suggesting a factor of >10 increase in millimeter-band luminosity. The source is 8 arcseconds away from WISEA J234051.04-430634.5. All flux calibrations quoted here are preliminary and are believed to be accurate to 20%. Further information including lightcurves and an updated catalog of SPT transient detections can be found at https://pole.uchicago.edu/public/data/transients/. The South Pole Telescope is a 10-meter telescope designed for observations of the cosmic microwave background located at Amundsen-Scott South Pole Station and supported by the National Science Foundation and the US Dept. of Energy. The SPT online transient program providing data in this telegram is supported by NSF grants AST-1716965 and OPP 1852617, and observes 1500 square degrees of the southern sky at 95, 150, and 220 GHz with an average revisit cadence of 12 hours. For more details on the SPT transient program and survey strategy, please see https://arxiv.org/abs/2103.06166.
|
2021-09-04 07:00:00
|
millimeter,agn,transient
|
2021-09-04
|
07:00:00
| 1,631 |
[
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] | 14,889 |
14,892 |
Spectroscopic Classifications of Optical Transients with Keck I + LRIS
|
K. W. Davis, M. R. Siebert, C. Rojas-Bravo, K. Taggart, S. Tinyanont, R. J. Foley (UCSC), C. R. Angus (DARK), J. D. R. Pierel (STScI)
|
We report the following classifications from spectroscopic observations with the LRIS spectrograph on the Keck I telescope, made on 2021 Sep 4 UT. The targets were supplied by ALeRCE (as supplied by the ZTF data stream), ATLAS, and YSE. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 decimal places, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure an H-alpha absorption velocity of -8,000 km/s. (2) We measure an H-alpha absorption velocity of -13,300 km/s. (3) We measure a Si II 6355 velocity of -11,000 km/s. (4) We measure an H-alpha FWHM of 600 km/s.
|
2021-09-05 00:14:00
|
optical,supernovae,transient
|
2021-09-05
|
00:14:00
| 697 |
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] | 14,890 |
14,893 |
MASTER OT J234518.89-443917.6 and MASTER OT J172202.29-645431.0 outbursts
|
O. Gress, K. Zhirkov, P. Balanutsa, V. Lipunov, V. Kornilov, E. Gorbovskoy, Y. Kechun, T. Pogrosheva, V. Shumkov, I. Gorbunov, N. Tyurina, A. Kuznetsov, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, A. Chasovnikov, E. Minkina, V. Topolev, D. Kuvshinov, V. Grinshpun (Lomonosov Moscow State University), D. Buckley (SAAO), R. Podesta, F. Podesta, C. Lopez, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), N. Budnev, O. Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
|
MASTER OT J172202.29-645431.0 discovery - new OT, preliminary dwarf nova outburst with ampl>4.8m AT2021xha https://www.wis-tns.org/object/2021xha MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 17h 22m 02.29s -64d 54m 31.0s on 2021-08-31.06731 UT. The OT unfiltered magnitude is 17.2m (mlim=18.6). The OT is seen in 10 images. There is no minor planet at this place. There is no any sources in VIZIER database inside 5" (22m POSS limit), it means >4.8m of current outburst amplitude (MASTER unfiltered m is calibrated for USNO-B1 as 0.2B+0.8R) There is previous outburst of this OT in MASTER database at 2019-01-16 08:33:40UT (17.8m) We have reference image on 2020-06-10.24444 UT with unfiltered mlim=18.9m. http://master.sai.msu.ru/static/OT/172202.29-645431.0.png
Spectral observations are required.
|
2021-09-05 00:55:00
|
optical,cataclysmic variable,nova,planet,transient,variables,request for observations
|
2021-09-05
|
00:55:00
| 907 |
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] | 14,891 |
14,894 |
RS Oph has entered the Supersoft phase
|
K. L. Page (U. Leicester)
|
Following the announcement in ATel #14885 of weak soft X-ray emission beginning to appear in the Swift XRT spectra of RS Oph from 2021 August 30, we can now confirm that RS Oph has entered the supersoft source (SSS) phase.
From 2021 September 01, the cadence of Swift observations was increased to twice a day, in order to monitor the possible new component. While this soft emission remained weak for five days, observations on September 04 show a strong increase in counts below 0.7 keV, which further brightened between the two observations performed around 10 UT (day 25.9, taking T0 to be the optical peak of the eruption, estimated to be around 2021 August 09.5417 from the AAVSO light-curve) and 20 UT (day 26.3) that day, causing the 0.3-10 keV count rate to increase from ~8 count s-1 to ~11 count s-1.
This soft component can be simply characterised by a blackbody with BB kT ~ 40 eV (assuming a total column density of 4 x 1021 cm-2, approximated from a single optically-thin component fit to the spectra just before the first sign of the enhanced soft emission), with the corresponding observed 0.3-1 keV flux increasing from 1.6x10-11 to 9.8x10-11 erg cm-2 s-1 between the two snapshots of data on September 04.
We note that, during the 2006 eruption of RS Oph, the first strong SSS component was detected on day 29, following a gap in observations from day 26, when there was a similarly weak component detected as shown in the spectra this past week (Osborne et al., 2011, ApJ, 727, 124). Thus far, the timescales for the X-ray evolution between the 2006 and 2021 eruptions appear similar.
We are grateful to the Swift PI and his deputies, as well as the science operations team, for their help in obtaining these data. Swift will continue to monitor RS Oph as the SSS emission evolves, and we encourage follow-up with other instruments and at all wavelengths to add to the dataset already stretching from gamma-rays to radio (ATels #14834, #14838, #14840, #14844, #14845, #14846, #14848, #14849, #14850, #14852, #14855, #14857, #14858, #14860, #14863, #14864, #14866, #14868, #14872, #14873, #14881, #14882, #14883, #14885, #14886).
|
2021-09-05 14:06:00
|
radio,optical,x-ray,gamma ray,nova
|
2021-09-05
|
14:06:00
| 2,152 |
[
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] | 14,892 |
14,895 |
[NeV] and coronal [FeX] emission appear in the spectra of RS Oph
|
U. Munari (INAF Padova), P. Valisa (ANS Collaboration), and P. Ochner (Univ. Padova)
|
We are maintaining a tight spectroscopic monitoring of RS Oph, with high resolution spectra being obtained each day since the onset of the 2021 outburst with the Varese 0.84m + Echelle (range 4250-8900 Ang, resolving power 18000), and at a similar pace in low resolution with the Asiago 1.22 + B&C (range 3200-7800, dispersion 2.3 Ang/pix). A pictorial atlas of the spectral evolution of RS Oph as recorded with these two instruments has been presented by Munari and Valisa (2021, arXiv 2109.01101).
The 2021 outburst of RS Oph is being observed at all wavelengths, stretching from gamma-rays to radio ((ATel #14834, ATel #14840, ATel #14845, ATel #14846, ATel #14848, ATel #14849, ATel #14850, ATel #14851, ATel #14852, ATel #14855, ATel #14860, ATel #14863, ATel #14864, ATel #14866, ATel #14868, ATel #14872, ATel #14882, and ATel #14886).
Following the appearance of high ionization emission lines (Shore et al. ATel #14881, ATel #14883) and turn on of the super-soft X-ray emission (Page ATel #14885, ATel #14894), RS Oph is now displaying strong [NeV] 3427 emission and coronal line [FeX] 6375 in our optical spectra. [FeXI] 3987 is not present yet.
The appearance of both [NeV] and [FeX] preeceded the emergence on Sept 4 of a clear SSS source in RS Oph. The first detection of [FeX] 6375 on our Varese 0.84m Echelle spectra occoured on Sept 2, and on the same date [NeV] 3427 became visible with the Asiago 1.22m + B&C. On our latest spectra for Sept 5.76 [FeX] has become much stronger than [FeVII] 6087.
|
2021-09-06 03:35:00
|
radio,optical,x-ray,gamma ray,nova
|
2021-09-06
|
03:35:00
| 1,516 |
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] | 14,893 |
14,896 |
INTEGRAL follow-up of the 4U 1730-22 outburst
|
. Ferrigno, V. Savchenko, E. Bozzo (ISDC/University of Geneva, CH), S. A. Grebenev (IKI, RU), J. Wilms (Remeis-Observatory and ECAP, FAU Erlangen-Nuernberg, D), L. Ducci (IAAT, De) E. Kuulkers (ESTEC/ESA, NL) on behalf of the Galactic bulge monitoring team
|
After the report of renewed activity from the low mass X-ray binary 4U 1730-22 (CXOU J173357.5-220156) using MAXI, Swift/XRT, NICER, and INTEGRAL data (ATels #14683, #14686, #14757, #14769, #14870), we followed its evolution during the repeated observation of the Galactic Centre under the programs led by PIs Wilms, Kuulkers, & Grebenev.
We extracted preliminary ISGRI and JEM-X1 spectra selecting pointings with off-axis angles of at most 12 degrees for ISGRI and 4 degrees for JEM-X. We combined the spectra from each 2.7-days-long satellite revolutions between 2021-08-07 16:49:02 and 2021-08-31 13:16:45 and fitted each spectrum with a powerlaw, which described the data satisfactorily a (at 99% confidence level) whenever the spectra had enough signal to noise ratio. The power-law photon index does not show any trend and has a weighted mean value of 2.14±0.04. The hard X-ray flux shows a linear decay that can be described as flux (20-100keV) = 340±7 + ( -7.9±0.7) (t - MJD 59434.3061 ) 10-12 erg/s/cm2.
Further observations of the Galactic centre region are scheduled for the coming weeks.
|
2021-09-07 00:23:00
|
x-ray,gamma ray,binary,neutron star,star,transient
|
2021-09-07
|
00:23:00
| 1,101 |
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] | 14,894 |
14,897 |
Fermi-LAT detection of renewed flaring activity from the blazar Ton 599 (4C +29.45)
|
D. Gasparrini (SSDC/INFN) on behalf of Fermi-LAT collaboration
|
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed renewed gamma-ray activity from a source positionally consistent with the flat spectrum radio quasar Ton 599, also known as 4FGL J1159.5+2914 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates RA = 179.8826413 deg, Decl. = 29.2455075 deg, (J2000; Johnston et al. 1995 AJ 110, 880) at z = 0.72449 (Adelman-McCarthy et al. 2008, SDSS6).
Preliminary analysis indicates that this source has been in an elevated gamma-ray emission state since mid-April, in particular reaching on September 5, 2021, a daily averaged gamma-ray flux (E>100MeV) of (2.1+/-0.2) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 17 relative to the average flux reported in the fourth Fermi-LAT catalog (4FGL). The corresponding photon index is 1.95+/-0.08, modestly harder than the 4FGL value of 2.19+/-0.01. GeV flaring emission in this source was previously reported in August 2010 (ATel #2795), November 2015 (ATel #8319), November 2017 (ATel #10931), and recently in June 2021 (ATel #14722) and July (ATel #14785). Flaring of Ton 599 has recently been reported in optical (ATel #14696) and mm/sub-mm bands (ATel #14781).
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. This source is one of the "LAT Monitored Sources" and consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT is publicly available ( http://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/ ). We encourage multifrequency observations of this source. For this source, the Fermi-LAT contact person are S. Ciprini ([email protected]) and D. J. Thompson ([email protected]).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
|
2021-09-07 00:26:00
|
radio,optical,gamma ray,agn,blazar,quasar
|
2021-09-07
|
00:26:00
| 2,104 |
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] | 14,895 |
14,898 |
Apparent Outburst of Comet 29P/Schwassmann-Wachmann
|
Kritti Sharma (IITB), Michael S. P. Kelley (U. Maryland), Vishwajeet Swain (IITB), Harsh Kumar (IITB), Urgain Stanzin (IAO), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA) on behalf of the GROWTH India Collaboration and Zwicky Transient Facility Collaboration
|
We report the discovery of an outburst of comet 29P/Schwassmann-Wachmann in GROWTH India Telescope (GIT) data. On 2021 September 4.804 UTC, the comet had an apparent brightness of r = 16.00 +/- 0.03 mag. In our second epoch on 2021 September 4.904 UTC, the comet had brightened to r = 15.17 +/- 0.03 mag. By our third epoch on 2021 September 4.953 UTC, the comet's magnitude was sustained at r = 15.05 +/- 0.04 mag, thereby suggesting an outburst strength of -0.95 +/- 0.05 mag. The averaged photometry for each epoch is measured with a 5" radius aperture. The magnitudes are calibrated against PanSTARRS PS1 data release (Flewelling et al., 2018). During our observations, the comet was at 5.910 AU from the Sun and 5.881 AU from the Earth. The event was confirmed in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) data, where the comet had brightened from g = 16.03 +/- 0.04 mag on 2021 September 2.456 UTC to r = 15.05 +/- 0.02 mag on 2021 September 5.425 UTC. The g-r colour of the comet is 0.53 mag, as measured from GIT and ZTF data.
The GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7 degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/
Based on observations obtained with the Samuel Oschin Telescope 48-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Grant No. AST-2034437 and collaboration including Caltech, IPAC, Weizmann Institute for Science, Oskar Klein Center at Stockholm University, University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, TANGO Consortium of Taiwan, University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
|
2021-09-07 00:34:00
|
optical,comet,the sun,transient
|
2021-09-07
|
00:34:00
| 2,211 |
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] | 14,896 |
14,899 |
uGMRT observations of the 2021 outburst of RS Ophiuchi
|
Nayana A. J. (IIA), G. C. Anupama (IIA), Dipankar Banerjee (PRL), Nirupam Roy (IISc), K. P. Singh (IISER-Mohali), and L. S. Sonith (IIA)
|
We report observations of the recurrent nova RS Ophiuchi (AAVSO Alert Notice 752) with the upgraded Giant Metrewave Radio Telescope (uGMRT). The observations were done in the 550-850 MHz band (band-4) on 2021 August 31.67 UT (t ~ 23 days post outburst discovery) and in the 1000-1460 MHz band (band-5) on 2021 Sep 02.53 UT (t ~ 25 days post outburst discovery). We detect radio emission from RS Ophiuchi with a flux density of 85.1 +/- 1.2 mJy at 1.36 GHz and 77.5 +/- 2 mJy at 0.69 GHz. The source is unresolved in our maps. The map resolution is 2.4 X 1.9 arcsec^2 and map rms is 120 uJy/beam in band-5. The map resolution and rms are 5.9 X 3.2 arcsec^2 and 50 uJy/beam, respectively in band-4. The flux densities at roughly similar epochs, at 0.61 and 1.1 GHz in the 2006 outburst, were ~ 48 and 55 mJy, respectively (Kantharia et al. 2007, ApJ, 667, L171). Further observations are planned. We thank the uGMRT staff for carrying out these observations.
|
2021-09-07 01:10:00
|
radio,nova
|
2021-09-07
|
01:10:00
| 956 |
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0.011251198127865791
] | 14,897 |
14,900 |
Near-Sun Photometric Follow-up of the Rapidly-Fading Sun-like Star ASASSN-21qj
|
D. D. Balam (DAO/National Research Council of Canada), C. E. Spratt (UVic-Ret), D. W. E. Green (CBAT) and Tyler Hrynyk (Canadian Space Agency)
|
We have taken advantage of the near-sun capabilities of the Canadian NEOSSat orbiting telescope (https://www.cadc-ccda.hia-iha.nrc-cnrc.gc.ca/en/neossat/) to perform follow-up photometry of the optical transient ASASSN-21qj (#14879), reported as under-going a rapid dimming event by the ASSASN survey, Shappee et al. 2014,(https://ui.adsabs.harvard.edu/abs/2017PASP..129j4502K/abstract) at relatively small solar elongation. The spacecraft was tasked to obtain a series of 60 second duration images over three orbits of the spacecraft that were co-added to yield image stacks of 2640, 3480 and 2460 seconds duration. We have performed differential aperture photometry using an aperture of 30 seconds of arc using the Gaia catalogue star Gaia DR2 5539975927391545344 (http://simbad.u-strasbg.fr/simbad/sim-id?Ident=%407439336&Name=TYC%207660-897-1&submit=submit) as a secondary standard in the field. The NEOSSat is an un-filtered detector, however, the sensitivity curve of the back illuminated E2V 47-20 CCD is similar to the Gaia G filter response curve. Our measurements yield the following magnitudes: UT 2021 Sept. 3.037 G_NEOSSat = 14.27(+/- 0.07), Sept. 3.169 G_NEOSSat = 14.15 (+/- 0.06) and Sept. 3.236 G_NEOSSat = 13.85 (+/- 0.07). ASASSN-21qj was 0.4 magnitudes fainter than its quiescent brightness before the field became Sun constrained on UT 2021-06-29. On UT Aug. 26 the ASSASN team reported the object as 1.5 magnitudes fainter and 24 hours later 2.2 magnitudes fainter than it quiescent brightness and dimming. Our measurements show that the star has brightened in the week since the ASASSN measurements. In addition, we have seen a brightening trend over the 7 hours of coverage of our orbiting sensor.
|
2021-09-07 01:28:00
|
optical,star,the sun,transient,variables
|
2021-09-07
|
01:28:00
| 1,721 |
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] | 14,898 |
14,901 |
Spectral and flux variability in NICER observations and optical spectra of RS Oph
|
S. Pei (Padova University), M. Orio (INAF-Padova and University of Wisconsin), K. Gendreau (NASA-GSFC), J. Mikolajewska (Nicolaus Copernicus Astronomical Center, N. Ospina (INFN and Padova University), E. Aydi (Michigan State University), Z. Azourmanian (NASA/GSFC), D. Buckley (South African Observatory), R. Carrera (INAF-Padova), J. Carbajo-Hijarrubia (University of Barcelona), T. Enoto (RIKEN), A. Fabian (IoA, Cambridge), E. Ferrara (NASA/GSFC, CRESST and University of Maryland College Park) M. Giese (University of Wisconsin), R. Ignace(East Tennessee State University), N. Islam Syeda (NASA/GSFC and University of Baltimore), K. Mukai, (NASA/GSFC, CRESST and University of Baltimore, Baltimore County), H. Maehara (National Astronomical Observatory of Japan), J. Miller (Univ. of Michigan), J. Nichols (CfA), M. Parker (IoA, Cambridge), P. Pragati (MIT Kavli Institute for Astrophysics and Space Research).
|
NICER monitoring of RS Oph in the 0.2-12 keV energy range is continuing with daily observations, with non-continuous exposure times ranging between about 1000 s and 9000 s each day. After 2021 August 17 (ATel #14864) we measured a steady, slow decrease of count rate in the 0.2-12 keV range as the X-ray source became softer (increasing in hardness ratio, namely count rate in the 0.2-1 keV band divided by count rate in the 1-12 keV band), but there were soft X-ray flares on 2021 August 26 and 27. On 2021 September 1st, the average count rate was 126.9 ± 0.5 cts/s in the 0.2-12 keV range. The spectrum was structured, with multiple components. A preliminary fit for the total exposure of ~3000 s on this date can be obtained with a column density N(H)=1.45 x 10x22 cm-2, a blackbody component at a temperature of 59 eV, and two components of collisionally ionized plasma in thermal equilibrium (APEC) at 0.2 and 1 keV, respectively. Although an alternative fit three APEC components, lower column density and lower luminosity cannot be ruled out, the blackbody luminosity in these exposures would be 7.4 x 1038 erg/s assuming a distance of 1.6 kpc. Even if a blackbody fits tends to overestimate the luminosity, this acceptable fit indicates that the central supersoft X-ray source, namely the hydrogen burning white dwarf, may have already emerged and be the origin of the supersoft flux reported also in ATel #14894. Optical spectra taken with both the SALT High Resolution Spectrograph and the Nordic Optical Telescope and the FIES spectrograph on 2021 September 1st show a strong He II emission line, that increased in flux by a factor of about 10 since a SALT spectrum was previously taken on 2021 August 28, reaching 5-6 x 10-11 erg/cm2/s on 2021 September 1st. This line was hardy measurable, and sometimes not even detectable, in several spectra taken every night with The Mercator 1.2m telescope and the HERMES spectrograph (see also ATel #14894) for eight previous nights in a row. This sudden increase in He II line flux is consistent with the ionizing flux observed in the supersoft X-rays with NICER. NICER observations continued and on 2021 September 4th, the soft X-ray flux had the largest flare. The average count rate on that day was 127.4 ± 0.2 cts/s in the 0.2-12 keV range, but in the 0.2-0.6 keV range, it increased from an average about 35 cts/s, to 130 cts/s during a period of time of only 5 minutes. On 2021 September 5th, the soft range count rate decreased again and was more stable. In the 0.2-0.6 keV soft band, we measured a pulsation with a period of 36.7 s on 2021 September 4, and a more definite modulation was measured in this energy range on September 5, with a period of 34.88 ± 0.02 s. Soft X-ray flares coincident with the onset of short period modulations were also found in the X-ray data obtained for the nova in 2006, see Nelson et al. 2008 (ApJ 673, 1067). NICER observations are ongoing, and so is the optical spectroscopic monitoring.
|
2021-09-07 05:12:00
|
optical,x-ray,nova
|
2021-09-07
|
05:12:00
| 2,985 |
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