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14,502 |
ASKAP detection of a repeat burst from the FRB 20201124A source
|
Pravir Kumar (Swinburne University of Technology, SUT), R. M. Shannon (SUT), V. Moss (CSIRO), H. Qiu (SKA Organisation), S. Bhandari (CSIRO) on behalf of the ASKAP-CRAFT collaboration
|
We report the detection of a Fast Radio Burst (FRB) with the Australian Square Kilometre Array Pathfinder (ASKAP), as part of the Commensal Real-time ASKAP Fast Transients (CRAFT) survey science project. The very strong burst, FRB 20210401A, was detected with a reported signal to noise ratio of 64 in the incoherent sum of 24 antennas. The burst is likely to be a repetition from the FRB20201124A source reported by the CHIME/FRB collaboration (ATEL #14497). ASKAP was operating with a central frequency of 864.5 MHz, an observing bandwidth of 336 MHz, a time resolution of 1.2 ms and a frequency resolution of 1 MHz.
A preliminary localisation was made using the multi-beam approach described in Bannister et al. (2017, ApJL, 841,12). The properties of the burst are as follows: Date: 2021-04-01 UTC: 11:33:01.66(1) RA (J2000): 05:07(1) DEC (J2000): 25:53(5) DM: 412(3) pc cm^-3 Fluence: 187 (12) Jy ms Intrinsic width: 3.2(6) ms Scattering time: 5.6(3) ms Quoted uncertainties are with 90% confidence.
|
2021-04-02 10:05:00
|
radio,fast radio burst,transient
|
2021-04-02
|
10:05:00
| 1,005 |
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] | 14,500 |
14,503 |
MASTER optical activity of blazar H 1426+428
|
K. Zhirkov, V. Lipunov, V. Kornilov (Lomonosov MSU), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), R. Podesta, F. Podesta, C. Francile (OAFA), D. Buckley (SAAO), , E. Gorbovskoy, O. Gress, N. Tiurina, P. Balanutsa, F. Balakin, V. Vladimirov, A. Kuznetsov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, A. Chasovnikov, A. Pozdnyakov, V. Topolev, D. Cheryasov, V. Shumkov, T. Pogrosheva (Lomonosov Moscow State University, SAI, Physics Department), N. M. Budnev (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveshchensk State Pedagogical University)
|
MASTER-Net (Lipunov et al., 2010, MASTER Robotic Net, Advances in Astronomy, vol. 2010, p.30L) reports on an enhanced optical activity of the blazar H 1426+428 during its elevated very-high energy gamma-ray flux(Quinn et al. ATel #14501).
MASTER-IAC observed the source on 2021-04-01 from 04:42UT to 05:21UT in BVRI and unfiltered with exposure time of 180s. Reference stars for aperture photometry were taken from GSC2.3 catalog for B and V bands, PPMX catalog for R band, LONEOS catalog for I band and from GAIA EDR3 for unfiltered band. We obtained the following magnitudes: B=16.80+/-0.04, V=16.21+/-0.07, R=16.34+/-0.09, I=15.67+/-0.04, W(unfiltered)=16.21+/-0.04.
Variability on a timescale of 10 minutes was not detected. Since MASTER-Net telescopes usually survey sky with no filter, we can directly compare only W band. Reference frame was taken on 2020-09-28 by MASTER-Tunka with a source magnitude of W=16.48+/-0.05. Considering it, we can assume that the blazar has an optical brightening, simultaneous with very-high energy gamma-ray flux (ATel #14501). We encourage multiwavelength observations. MASTER-Net will continue observing the blazar in the following nights.
|
2021-04-02 14:55:00
|
optical,gamma ray,agn,blazar,star,request for observations
|
2021-04-02
|
14:55:00
| 1,182 |
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] | 14,501 |
14,504 |
Insight-HXMT detection of the hard-to-soft state transition in the black hole binary GX339-4
|
Hexin Liu (IHEP); Liang Zhang (Uni. of Southampton); Lian Tao; Yupeng Chen; Jinlu Qu; Shu Zhang; Shuang-nan Zhang on behalf of the HXMT team
|
The black hole X-ray binary GX 339-4 entered a new outburst in January 2021 (ATels #14336, #14351, #14352, #14354, #14367, #14384, #14400, #14419, #14440). Insight-HXMT has monitored the outburst since 2021 February 18 (MJD 59263.16) with a nearly daily cadence.
|
2021-04-02 18:03:00
|
x-ray,binary,black hole,transient
|
2021-04-02
|
18:03:00
| 262 |
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0.012844748795032501,
0.07683484256267548,
-0.09312659502029419,
-0.05847539007663727,
-0.028618399053812027
] | 14,502 |
14,505 |
Correction for Atel #14504
|
Hexin Liu
|
In the third paragraph of Atel #14504, the expression "Starting from MJD 59298.2 (25^th Mar) to MJD 59301.2 (28^th Mar), the 1-150 keV band flux rose rapidly from 1.65E-08 erg/cm^2/s to ~1.15E-06 erg/cm^2/s." is incorrect and is now revised to "Starting from MJD 59298.2 (25^th Mar) to MJD 59301.2 (28^th Mar), the 1-150 keV band flux rose rapidly from 1.81E-08 erg/cm^2/s to ~7.32E-08 erg/cm^2/s."
|
2021-04-02 21:08:00
|
binary,black hole
|
2021-04-02
|
21:08:00
| 398 |
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] | 14,503 |
14,506 |
Detection of very-high-energy gamma-ray emission from GB6 J1058+2817 with the MAGIC telescopes
|
Oscar Blanch (IFAE-BIST), on behalf of the MAGIC collaboration
|
The MAGIC collaboration reports the first detection of very-high-energy (VHE; E>100 GeV) gamma-ray emission from GB6 J1058+2817 (R.A. = 164.624562 deg, Decl. = 28.296170 deg, J2000.0; Petrov & Taylor 2011 AJ, 142, 89) . The object was observed with the MAGIC telescopes for 2.4 hours on 2021/04/01 (MJD 59305.9). The preliminary analysis of these data resulted in the detection of GB6 J1058+2817 with a statistical significance of 6 standard deviations. The preliminary VHE flux of this detection was estimated to be about 10% of the flux from the Crab nebula above 100 GeV. GB6 J1058+2817 is a blazar. Its redshift is not well established, with a tentative value of z=0.4793 (Massaro et al. 2014 AJ, 148, 66). The MAGIC observations were triggered by flaring activity at GeV reported by Fermi-LAT (ATel # 14491). In addition to the enhanced activity in gamma rays, increase of the flux has been seen as well in optical frequencies (ATel #14496). MAGIC observations on GB6 J1058+2817 will continue during the next days and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are O. Blanch ([email protected]) and Julian Sitarek ([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.
|
2021-04-03 02:58:00
|
optical,gamma ray,tev,vhe,agn,blazar
|
2021-04-03
|
02:58:00
| 1,418 |
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] | 14,504 |
14,507 |
ATCA observations of radio flaring emission from GX 339-4 during the current hard-to-soft state transition
|
S. Corbel (Universite de Paris), T. Tzioumis (ATNF), T. D. Russell (INAF-Palermo), J. C.A. Miller-Jones (ICRAR - Curtin), E. Tremou (Observatoire de Paris)
|
Following the reactivation of GX 339-4 early 2021 after a period of quiescence (see e.g. ATel #14336, #14351, #14352), we have been monitoring regularly GX 339-4 in radio with the Australia Telescope Compact Array, located in Narrabri, Australia. Observations are usually conducted at 5.5 GHz and 9.0 GHz with a 2 GHz bandwidth.
GX 339-4 recently left the hard state (ATel #14419, #14490) and the ATCA observed the associated quenching of the compact jets from ~28 mJy down to less than 1 mJy. The transition to the soft state started around 2021, March 28 (ATel #14490) and we report the detection of stronger flaring radio emission starting on March 31 and currently continuing as of April 2 with flux density of up to ~50 mJy.
Given the continuing flaring radio activities, we encourage further multi-wavelength observations to accompany the forthcoming new radio observations.
We thank Jamie Stevens and the staff of the ATCA for prompt scheduling of these observations.
|
2021-04-03 16:08:00
|
radio,black hole,transient,request for observations
|
2021-04-03
|
16:08:00
| 977 |
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] | 14,505 |
14,508 |
A second fast radio burst from the source of FRB 201124A detected by ASKAP
|
Pravir Kumar (Swinburne University of Technology, SUT), R. M. Shannon (SUT), E. Keane (NUI Galway), V. A. Moss (CSIRO), on behalf of the ASKAP-CRAFT survey science project.
|
We report the detection of a second Fast Radio Burst (FRB) coincident with the FRB20201124A source, using the Australian Square Kilometre Array Pathfinder (ASKAP), as part of the Commensal Real-time ASKAP Fast Transient (CRAFT) survey science project. The burst, FRB 20210402A, was detected with a reported signal to noise ratio of 13.4 in the incoherent sum of 23 antennas. The system was operating with a central frequency of 1271.5 MHz, an observing bandwidth of 336 MHz, and a time resolution of 1.2 ms.
The properties of the burst are as follows: Date: 2021-04-02.24235085 UTC: 05:48:59.114(1) RA(J2000): 05:08(1) DEC(J2000): 26:02(10) Fluence: 22(3) Jy ms Dispersion measure: 414 (3) pc cm^-3 Quoted uncertainties are with 90% confidence. The burst position and dispersion measure are consistent with the previously reported ASKAP burst (ATel #14502), and that reported by the CHIME/FRB collaboration (ATel #14497).
We note that both ASKAP-detected bursts were very bright, and with flux concentrated at the lower end of both bands. The reported fluences average over the entire band. We estimate that a 20-metre diameter antenna (with aperture efficiency of 0.63 and system temperature of 30 K) could have detected the first 700-800 MHz burst at a signal to noise ratio of 10. The second 1100-1200 MHz burst would have been detected at the same signal to noise ratio by a 40-metre antenna.
These bursts would have had S/N values of ~2800 and ~800 respectively if detected with the largest effective apertures currently available, meaning follow-up with high-gain instruments may reveal more weaker pulses. However, given the brightness of these bursts, follow-up with radio dishes of all sizes would likely be fruitful.
|
2021-04-03 18:32:00
|
radio,fast radio burst,transient
|
2021-04-03
|
18:32:00
| 1,729 |
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] | 14,506 |
14,509 |
Correction to ATel #14508
|
Pravir Kumar (Swinburne University of Technology, SUT), R. M. Shannon (SUT), E. Keane (NUI Galway), V. A. Moss (CSIRO), on behalf of the ASKAP-CRAFT survey science project.
|
In ATel #14502 and ATel #14508 we reported two repetitions of FRB 20210402A. In the latter we estimated that the bursts were so bright as to be detectable with 20-metre and 40-metre dishes, respectively, with a signal-to-noise ratio of 10. Subsequently, correcting our calculations, we find that the bursts are brighter still. More accurately we estimate that they would be detectable with a signal-to-noise ratio of 10 with a 10-metre and 20-metre dish, respectively (with aperture efficiency of 0.63, system temperature 30K)
|
2021-04-04 11:07:00
|
radio,fast radio burst
|
2021-04-04
|
11:07:00
| 526 |
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] | 14,507 |
14,510 |
SRG discovery of SRGA J181414.6-225604 == SRGe J181415.1-225617 - possible Galactic X-ray transient
|
I. Mereminskiy(1), A. Semena(1), A. Lutovinov(1), S. Molkov(1), A. Tkachenko(1), M. Gilfanov(1, 2), P. Medvedev(1), R. Sunyaev (1, 2) (1: IKI RAS, Moscow, Russia; 2: MPA, Garching, Germany)
|
On Apr 1, 2021, during the third SRG all-sky survey, the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory discovered a bright X-ray source at RA, Dec = 273.5611, -22.9345 (J2000) with a 90% error radius of 15". The source was detected with the X-ray flux of ~4x10-11 ergs cm-2 s-1 in the 4-12 keV energy band. No objects were detected by ART-XC at that position in the first two surveys in 2020.
Simultaneously, the source was also detected by SRG/eROSITA, which provided an improved position at 273.56301, -22.93807 (J2000), with an uncertainty radius of 9" (95%). The eROSITA data suggest a fairly absorbed and hard spectrum with NH=1.4x1022 (error interval of (0.1-4.6)x1022 at 90% confidence), photon index Gamma=0.5 (error interval of -0.9 - 2.7) and 0.5-6 keV flux of ~6.4x10-12, compatible with the hard X-ray flux, observed by ART-XC.
A faint absorbed source with several times smaller flux was also found at this position in the SRG/eROSITA data of the first two sky surveys.
Given the absorption and location of the source close to the Galactic bulge we tentatively propose the source to be a Galactic X-ray binary.
We note also that there is an archival X-ray source in XMM-Newton slew survey (XMM-SSC, 2017), labelled as XMMSL2 J181414.6-225613, located in 8" from the derived position, inside the eROSITA 95% localization region. The source was observed once in 2010 at a flux level of 3x10-12 erg cm-2 s-1 in the 0.2-12 keV band.
There are several IR and optical sources of different magnitudes inside the eROSITA localization region. Additionally, according to the GAIA data there are no local sources with estimated distances below few kpc, implying that the intrinsic luminosity of the source is about 1034 erg s-1 or higher.
Multiwavelength observations are urged to uncover the nature of this hard transient. We will organize X-ray and optical observations as soon as there will be visibility.
ART-XC and eROSITA are X-ray telescopes on board the SRG observatory which was launched from the Baikonur cosmodrome on 13 July 2019 by the Proton rocket. ART-XC has been renamed 'Mikhail Pavlinsky ART-XC telescope' in honor of its first PI, Dr. Mikhail Pavlinsky, who passed away in July 2020.
|
2021-04-05 05:33:00
|
optical,x-ray,binary,transient
|
2021-04-05
|
05:33:00
| 2,229 |
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0.07128779590129852,
-0.031811341643333435,
-0.08023813366889954,
-0.042903296649456024
] | 14,508 |
14,511 |
MASTER optical observation of the blazar GB6 J1058+2817
|
K. Zhirkov, V. Lipunov, V. Kornilov (Lomonosov MSU), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), R. Podesta, F. Podesta, C. Francile (OAFA), D. Buckley (SAAO), , E. Gorbovskoy, O. Gress, N. Tiurina, P. Balanutsa, F. Balakin, V. Vladimirov, A. Kuznetsov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, A. Chasovnikov, A. Pozdnyakov, V. Topolev, D. Cheryasov, V. Shumkov, T. Pogrosheva (Lomonosov Moscow State University, SAI, Physics Department), N. M. Budnev (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveshchensk State Pedagogical University)
|
MASTER-Net reports on an enhanced optical activity of a flaring blazar GB6 J1058+2817 (ATels #14491, ATel #14496, ATel #14506). Following the announcement of the flaring state of the object, MASTER-SAAO and MASTER-IAC started observing the object at 2021-03-29 19:36 and 22:00 respectively, with no filter and with the exposure time of 180s. Resulting magnitude of the blazar was found to be at 17.05+/-0.03(1 standard deviation). Additional observations were made on the 2021-04-05, with the magnitude of 16.94+/-0.03. Due to gaps in our observations the closest frame before the flare was at 2020-02-23 23:43 with the magnitude of 17.49+/-0.05. Considering this, we can safely assume that the blazar brightened since 2020-02-23. We encourage further multiwavelength observations of the blazar. MASTER-Net will keep observing it for following nights.
|
2021-04-06 00:57:00
|
optical,gamma ray,agn,blazar,request for observations
|
2021-04-06
|
00:57:00
| 851 |
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] | 14,509 |
14,512 |
A NuSTAR Observation of the black hole candidate XTE J1859+226 at a low Eddington fraction
|
Paul A. Draghis (University of Michigan), Jon M. Miller (University of Michigan), Mayura Balakrishnan (University of Michigan), Mark Reynolds (University of Michigan), Abigail Stevens (University of Michigan), Bailey Tetarenko (University of Michigan), Nicolas Trueba (University of Michigan), Abderahmen Zoghbi (University of Michigan)
|
The black hole LMXB system XTE J1859+226 was observed to brighten in optical in February 2021 using ZTF (ATel #14372) and in X-rays using Swift (ATel #14375). We observed the source using NuSTAR on 2021 February 13 under ObsID 90701305002 for a net exposure of 41 ks, with an average count rate of 0.1 counts/second when combining the two FPM NuSTAR sensors.
The light curve shows no variability on the time scale of the observation. Spectra were extracted from circular regions with 60 arcsecond radii centered at the position of the source with similar sized background regions. The spectra are dominated by the background flux above 20 keV, so all spectral analysis was performed in the 3-20 keV band. The spectra were binned to have a minimum of 20 counts per bin. All uncertainties reported represent the 90% confidence ranges for each parameter.
Fitting the spectra with a power law produces a good fit, with chi2/dof = 79.30/85 (0.93), returning a value of the photon index of the power law Gamma = 1.84 +/- 0.12. The fit shows evidence of residual emission in the 6-7 keV range, which can be linked to reflection from the accretion disk. Reflection can be used to determine the geometry of the flow and the inner radius of the accretion disk, especially at low Eddington fractions. We explored whether the data supports a Gaussian emission line. Adding a Gaussian component to the power law model and fitting for its position, width, and normalization returns as best fit parameters a line centered at 6.7 +0.2/-0.3 keV with a FWHM of 0.2 +0.8/-0.2 keV and an equivalent width of 270 +/- 230 eV, without changing the power law index. The addition of the Gaussian component improves the fit, producing a chi2/dof = 73.21/82 (0.89). The change in chi2 of 6.09 at the cost of three extra parameters gives an improvement at the level of 1.6 sigma. This line is consistent with both the Fe K line and with He-like Fe XXV. We note additional residual emission in the 8-9 keV range which, when fitted with a second Gaussian component, produces a chi2/dof = 65.32/79 (0.83). The line center of this second Gaussian component is at 8.4 +/- 0.2 keV and the FWHM is 0.5 +0.7/-0.5 keV, with an equivalent width of 370 +/-310 eV.
The 1-10 keV flux of XTE J1859+226 at the time of this observation was 1.23 E-12 erg/cm^2/s and the 0.3-8 keV flux of 1.56 E-12 erg/cm^2/s was three orders of magnitude larger than the quiescent flux of this source (1.5 E-15 erg/cm^2/s) predicted by Tomsick et al. 2003. For the parameter estimates from literature of the distance to XTE J1859+226 and the mass of the central black hole, the Eddington fraction of the source during the observation was in the range of 0.03 - 0.30 %. Tomsick et al. 2009 found that at a similarly low Eddington fraction (0.14%), the black hole GX 339-4 shows evidence of an accretion disk truncated at more than 35 R_g, suggesting that at low luminosity the inner part of the disk is not present, unlike during high luminosity phases. While additional fits with reflection models suggest the possibility of an accretion disk truncated at large distances, for XTE J1859+226, the data are unable to significantly distinguish between a disk truncated at the ISCO or at larger radii.
We thank Fiona Harrison and the NuSTAR planning team for executing this observation.
References:
Tomsick, J. A., Corbel, S., Fender, R., et al. 2003, ApJL, 597, L133;
Tomsick, J. A., Yamaoka, K., Corbel, S., et al. 2009, ApJL, 707, L87.
|
2021-04-06 06:01:00
|
optical,x-ray,binary,black hole,transient
|
2021-04-06
|
06:01:00
| 3,480 |
[
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] | 14,510 |
14,513 |
Spectroscopic Classification of PNV J17581670-2914490 as a classical nova
|
Kenta Taguchi, Miho Kawabata, Masayuki Yamanaka, Keisuke Isogai (Kyoto University)
|
We report our spectrum of the transient PNV J17581670-2914490. We obtained the spectrum on 2021-04-05.828 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 reported to CBAT, this transient was discovered by Andrew Pearce at 8.4 mag (unfiltered) on 2021-04-04.825 UT (see also vsnet-alert for detail). Rob McNaught reported non-detection on 2021-04-02.776 UT (unfiltered limiting mag 11.0). Seiichiro Kiyota reported multicolor photometry results: B = 9.03, V = 8.02, and Ic = 6.82 (these results were reported at 2021-04-05.4188 UT, but the observation time is not reported). Andrew Pearce also reported multicolor photometry results: V = 8.08 on 2021-04-05.482 UT, B = 9.16 on 2021-04-05.483 UT, and I = 6.50 on 2021-04-05.484 UT. ASAS-SN Sky Patrol also reported photometries: in average, it was g = 14.25 on 2021-04-05.290 UT and g = 14.22 on 2021-04-05.458 UT.
Our spectrum shows Balmer lines, Fe II lines, and the Na I D line. Note that the interstellar extinction is not corrected. The Hα line has the P-Cygni profile, whose absorption component is blue-shifted by ∼1000 km/s from the redder emission component (for convenience, we plot the spectrum in two ways: the blue curve is "rest" spectrum in which the emission peak of the Hα line is offset to its rest wavelength to correct the radial velocity of the target. the green one is red-shifted by 1000 km/s from the blue one, for the visibility of absorption components). Fe II lines have absorption profiles whose wavelengths are consistent with the 1000 km/s blue-shift. The Na I D line has a combined profile of a "rest" absorption component and a broad absorption component which is blue-shifted by ∼1000 km/s from the "rest" one. Hidehiko Akazawa also reported his spectrum, confirming our results.
According to our spectrum and the brightness, we conclude that this object is a classical nova. The spectrum is similar to those of the slow nova V1280 Sco in the early stage (Naito et al. 2012, Hanindyo et al. 2008).
|
2021-04-06 13:25:00
|
optical,cataclysmic variable,nova,transient,variables
|
2021-04-06
|
13:25:00
| 2,128 |
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] | 14,511 |
14,514 |
Correction: ATel #14513 Spectroscopic Classification of PNV J17581670-2914490 as a classical nova
|
Kenta Taguchi, Keisuke Isogai (Kyoto University)
|
There are two mistakes in our ATel #14513. We wrote "Seiichiro Kiyota reported multicolor photometry results: B = 9.03, V = 8.02, and Ic = 6.82 (these results were reported at 2021-04-05.4188 UT, but the observation time is not reported)". The date 2021-04-05.4188 UT was not the reported time but the observation time. We also wrote "ASAS-SN Sky Patrol also reported photometries: in average, it was g = 14.25 on 2021-04-05.290 UT and g = 14.22 on 2021-04-05.458 UT". By mistake, we used the limiting magnitude, not the observed magnitude. The correct values are g = 9.48 on 2021-04-05.290 UT and g = 9.34 on 2021-04-05.458 UT. We are sorry for our careless mistakes and any inconvenience. Thank you very much for those who pointed out our mistakes.
|
2021-04-06 15:03:00
|
optical,cataclysmic variable,nova,transient,variables
|
2021-04-06
|
15:03:00
| 750 |
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] | 14,512 |
14,515 |
ASKAP localisation of the FRB 20201124A source
|
C. K. Day (Swinburne University of Technology, SUT), S. Bhandari (CSIRO), A. T. Deller (SUT), R. M. Shannon (SUT), V. A. Moss (CSIRO), on behalf of the ASKAP-CRAFT survey science project
|
Here we report on further analysis and follow up of the FRB20201124A source (ATel #14497) with the Australian Square Kilometre Array Pathfinder (ASKAP) as part of the ASKAP-CRAFT survey science project.
When ASKAP detected repeat bursts from the source (ATel #14502, ATel #14508), voltage data from buffers from individual antennas were triggered and downloaded. This enabled interferometric localisation of the burst, using methods described in Bannister et al. (2019, Science, 365, 565). The position reported here is from the second burst detected by ASKAP in the higher 1.3-GHz band (ATel #14508).
The burst was localised to the following best-fit position (epoch J2000): RA: 05:08:03.662 DEC: +26:03:39.82 The total uncertainty in the burst position comprises a statistical component (dependent on the S/N of the FRB image) and a systematic component related to the uncertainty of the astrometric frame registration. The reference frame correction, and its associated uncertainty, were derived by comparing positions of continuum sources detected in the 3-s voltage download containing the FRB) with catalogue counterparts, in this case from the NVSS (Condon et al. 1999, AJ, 115,1693). Currently, the systematic uncertainty dominates the total, but the position and its uncertainty may be refined if more precise positions for the continuum sources in the field surrounding the FRB are determined, or as additional bursts from this source are analyzed. We currently estimate the total uncertainty to be less than 1 arcsec for each coordinate.
The burst is spatially coincident with a galaxy cataloged in the Sloan Digital Sky Survey photometric survey, SDSS J050803.48+260338.0. The galaxy has a catalogued photometric redshift of z=0.08+/- 0.02, as calculated using the kd-tree nearest-neighbor fit algorithm (Ahumada et al, submitted to ApJS; arXiv:1912.02905). The galaxy is also catalogued in the first Pan-STARRS data release with a reported photometric redshift of z=0.105 (Beck et al. 2020, MNRAS, 500,1633). Further analysis with refined astrometry will be used to quantify the chance coincidence.
We encourage multi-wavelength follow-up of the host galaxy of the FRB20201124A source while it remains in its current active phase.
|
2021-04-06 20:50:00
|
radio,fast radio burst
|
2021-04-06
|
20:50:00
| 2,247 |
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] | 14,513 |
14,516 |
A redshift for the putative host galaxy of FRB20201124A
|
C. D. Kilpatrick, W. Fong (Northwestern University), J. X. Prochaska (UC Santa Cruz), N. Tejos (Pontificia Universidad Catolica de Valparaiso), S. Bhandari (CSIRO), C. K. Day (Swinburne University of Technology)
|
We report a redshift estimate for FRB20201124A, discovered by the CHIME/FRB Collaboration (ATel #14497) and further detected and localized to arcsecond precision by ASKAP-CRAFT (Kumar et al., ATel #14502; ATel #14508; Day et al., ATel #14515). A putative, catalogued host galaxy, SDSS J050803.48+260338.0 was reported in ATel #14515. We initiated observations of the host galaxy of FRB20201124A with the Binospec optical spectrograph at the MMT Observatory on Mount Hopkins, Arizona on 3 April 2021 UT. In 4x600s exposures of the host galaxy, we detect several emission lines, including H-beta, H-alpha, [N II], and [S II] at a common redshift of z=0.098+/-0.002, in agreement with photometric redshift estimates from SDSS and Pan-STARRS. We consider this to be the redshift of FRB20201124A. We thank the MMT Observatory staff, in particular Benjamin Weiner and Skyler Self for scheduling and executing these observations.
|
2021-04-06 22:08:00
|
radio,optical,fast radio burst
|
2021-04-06
|
22:08:00
| 922 |
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] | 14,514 |
14,517 |
INTEGRAL upper limits at higher energies on the SRG transient SRGA J181414.6-225604==SRGe J181415.1-225617
|
V. Sguera (INAF-OAS Bologna, Italy), L. Sidoli (INAF-IASF Milano, Italy)
|
Recent SRG observations, performed during the third all-sky survey, discovered a new X-ray transient on 1 Apr 2021 (ATel #14510). The source, possibly a Galactic X-ray binary, was detected at a flux level of about 4 x 10-11 erg cm-2 s-1 (4-12 keV).
|
2021-04-06 23:58:00
|
x-ray,binary,transient
|
2021-04-06
|
23:58:00
| 248 |
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] | 14,515 |
14,518 |
FAST detection and localization of FRB20201124A
|
Heng Xu (PKU), Jiarui Niu (NAOC), Kejia Lee (PKU, NAOC), Weiwei Zhu (NAOC), Bing Zhang (UNLV), Yi Feng (NAOC), Bojun Wang (PKU), Jiangwei Xu (PKU), Chunfeng Zhang (PKU), Dejiang Zhou (NAOC), and FAST FRB Key Science Project
|
We report the detection of FRB20201124A by the Five-hundred-meter Aperture Spherical radio Telescope (FAST) since MJD 59305. ATel #14497, ATel #14502; ATel #14508 reported the recently heightened activity of the CHIME-discovered FRB20201124A and the detections by CHIME and the ASKAP-CRAFT survey science projects. We observed FRB20201124A using the L-band 19beam system of FAST on April 1st and 2nd and conducted two griding observations. We detected more than 100 bursts from MDJ 59305 to 59310. Based on the detections of the bright bursts appearing simultaneously in multiple FAST beams, we localized the FRB to the following best-fit position: 05:08:03.4, +26:03:33.3. The error contour is elongated as shown in figure at https://psr.pku.edu.cn/wp-content/uploads/2021/04/FAST-FRB20201124A-POS.png. In 1 arcmin field, there are 4 candidate host galaxies. The FAST localization suggests that SDSS J050803.48+260338.0 is the preferred candidate, as indicated by the red star at the center of the error contour. This agrees with the localization of of ASKAP ATel #14515.
|
2021-04-07 00:32:00
|
radio,fast radio burst,star
|
2021-04-07
|
00:32:00
| 1,072 |
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] | 14,516 |
14,519 |
High Frequency Radio Observations of FRB 20201124A at 2.26 GHz using the Deep Space Network
|
Aaron B. Pearlman (Caltech, McGill University, McGill Space Institute), Walid A. Majid (JPL, Caltech), Thomas A. Prince (Caltech, JPL), Karishma Bansal (JPL), Charles J. Naudet (JPL), Jonathon Kocz (UC Berkeley)
|
FRB 20201124A is a repeating fast radio burst (FRB) source that was discovered using the CHIME/FRB radio telescope (ATel #14497). Over the past few weeks, multiple radio bursts have been detected from FRB 20201124A by several instruments, including the CHIME/FRB (ATel #14497), ASKAP (ATel #14502; ATel #14508), and FAST (ATel #14518) radio telescopes. These observations suggest that FRB 20201124A has entered into a highly active state and is capable of producing emission over a wide range of radio frequencies. We report the results of a radio observation of FRB 20201124A using the Deep Space Network (DSN) 34 m diameter radio telescope (DSS-13) in Goldstone, California. We carried out a continuous radio observation on 31 March 2021 (MJD 59304), starting at 21:18:46 (UTC), using the S-band receiver (center frequency: 2.26 GHz) outfitted on DSS-13. The total duration of the observation was 10680 s. Channelized power spectral density measurements were recorded in a digital polyphase filterbank across a total bandwidth of 110 MHz with a frequency and time resolution of 0.625 MHz and 102.4 us, respectively. We dedispersed the S-band data with trial DMs between 300 and 500 pc cm^-3 and carried out a search for radio bursts using a Fourier domain matched filtering algorithm, where each dedispersed time-series was convolved with boxcar functions with logarithmically spaced widths between 102.4 us and 100 ms. Candidates with detection signal-to-noise ratios (S/N) above 7.0 were saved and visually inspected for verification. No radio bursts were detected during our observation above a S/N threshold of 7.0. This observation was performed using the best-fit localization of FRB 20201124A reported by the CHIME/FRB collaboration in ATel #14497: RA (J2000) 05:08, DEC (J2000) +26:11. The angular offset between our pointing position and the best-fit position from the ASKAP localization of FRB 20210402A (ATel #14515) is 7.4 arcmin. However, we note that the beam size of DSS-13 is roughly 16.4 arcmin at 2.26 GHz, and this observation with DSS-13 would have also been sensitive to detecting radio bursts at S-band from the best-fit position of FRB 20210402A determined by ASKAP, if they had comparable fluences to the bursts reported in ATels #14502 and #14508. We place a 7-sigma upper limit of 5.4 Jy ms on the fluence of radio bursts during this observation, assuming a burst width of 1 ms at 2.26 GHz. This upper limit corresponds to a fluence detection threshold at the best-fit position of FRB 20210402A (ATel #14515). We have applied a correction factor of 1.8 due to the angular offset of our pointing position, which was derived assuming a two-dimensional Gaussian beam model with a full width at half maximum (FWHM) of 16.4 arcmin. We are grateful to the DSS-13 operators and the CHIME/FRB collaboration for their support of these observations.
|
2021-04-07 13:21:00
|
radio,fast radio burst,transient
|
2021-04-07
|
13:21:00
| 2,867 |
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] | 14,517 |
14,520 |
MAGIC detection of an increased activity from PG 1553+113 in very-high-energy gamma rays
|
Oscar Blanch (IFAE-BIST), 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 PG 1553+113 (RA=15:55:43, DEC=11:11:23, J2000.0). The preliminary analysis of the MAGIC data taken on 2021/04/06 (MJD 59310.1), during a regular monitoring of the source, indicates an integral flux of ~0.25% of the flux from the Crab nebula above 150 GeV, which is a factor of ~4 higher with respect to the low-state VHE flux from this source. PG 1553+113 is a bright VHE blazar with uncertain redshift (z>0.4; Danforth et al. 2010, ApJ 720, 976). It is one of the few blazars with a convincing quasi-periodic emission in the gamma-ray band, as observed by the Fermi-LAT satellite (Ackermann et al. 2015, ApJL 813, L41). In the next months the source is expected to approach a gamma-ray maximum according to the ~2 years periodic modulation. The MAGIC observations were performed within the framework of a multi-year, multiwavelength campaign started in 2015. In optical, the source is currently monitored with the Telescopi Joan Oró (Montsec Observatory) as part of the Tuorla Blazar Monitoring Program (https://users.utu.fi/kani/1m/PG_1553+113.html). The long-term lightcurve shows an enhanced optical activity that started already in March, at the beginning of the 2021 monitoring campaign. MAGIC observations on PG 1553+113 will continue during the next months and multiwavelength observations are encouraged. The MAGIC contact persons for these observations are Oscar Blanch ([email protected]), Elisa Prandini ([email protected]), and Serena Loporchio ([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.
|
2021-04-07 19:41:00
|
optical,gamma ray,tev,vhe,blazar
|
2021-04-07
|
19:41:00
| 1,827 |
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] | 14,518 |
14,521 |
SRG/ART-XC detection of an ongoing activity from X-ray pulsar XTE J1829-098
|
A. Shtykovsky(1), S. Molkov(1), A. Semena(1), A. Lutovinov(1), I. Mereminskiy(1) (IKI RAS, Moscow, Russia)
|
On Apr 5-6, 2021, during the third SRG all-sky survey, the Mikhail Pavlinsky ART-XC telescope on board the SRG observatory covered the sky field containing the XTE J1829-098 - known X-ray pulsar with period of 7.8s. The source was detected with the X-ray flux of (3.2±0.3)x10-10 erg cm-2 s-1 in the 4-12 keV energy band (or approx. 23 mCrab). No activity was seen from the source in the first two ART-XC all-sky surveys, with an upper flux limit of about 10-11 erg cm-2 s-1. Therefore we regard the observed activity as an onset of a new outburst. Note, that typically outbursts of this source are quite short, lasting a few weeks.
The cyclotron resonance scattering feature (CSRF) was detected at ~15 keV in the NuSTAR observations (Shtykovsky et al., 2018) during the previous outburst in August, 2018 (Nakajima et al., 2018, ATel#11927). Although there is a known NIR counterpart (Halpern and Gotthelf, 2007) for the source, neither the type nor the class of a secondary star has been defined.
We encourage further multiwavelength observations of the source.
ART-XC is the X-ray telescope on board the SRG observatory which was launched from the Baikonur cosmodrome on 13 July 2019 by the Proton rocket. ART-XC has been renamed 'Mikhail Pavlinsky ART-XC telescope' in honor of its first PI, Dr. Mikhail Pavlinsky.
|
2021-04-07 20:13:00
|
x-ray,pulsar,star,transient
|
2021-04-07
|
20:13:00
| 1,319 |
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] | 14,519 |
14,522 |
Cometary Activity on Asteroid 2005 XR132 Observed at Lulin Observatory
|
Yu-Chi Cheng (NTNU-PHYS), Wei-Jie Hou (IANCU), and Wing-Huen Ip (IANCU)
|
We discover a tail-like structure along the anti-solar direction of the asteroid 2005 XR132 with the Lulin One-meter Telescope (LOT) in Taiwan. The cometary activity is clearly shown in our four individual 480s R-band images under the bin 2 readout mode taken on April 5 and 6. No background stars or galaxies are seen along the pathway of 2005 XR132 in the Pan-STARRS 1 stacked r' image. The position angle of the weak tail ranges from 0 to 60 degree, with 11 arcsec in length. The integrated brightness within a photometric aperture of 4 pixels in radius is R~19.7 mag (calibrated by the USNO B1 catalog). Our syndynes-synchrones simulation indicate that 2005 XR132 has been ejecting dust particles since ~100 days ago. The images, the reference frame, and the dust simulation can be found at http://140.115.34.237/XR132_LOT.png . Follow-up observations are required to clarify the nature of this transient object. This work is based on the observations made with Lulin 1-m telescopes at Lulin Observatory (MPC code: D35), operated by Institute of Astronomy, NCU, Taiwan.
|
2021-04-07 21:54:00
|
optical,asteroid,comet,solar system object,star,transient,request for observations
|
2021-04-07
|
21:54:00
| 1,073 |
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] | 14,520 |
14,523 |
Swift observations of FRB20201124A
|
Sergio Campana (INAF-OA Brera)
|
We observed the location of FRB20201124A (ATel #14515, #14518), with the Swift satellite. XRT started observing FRB20201124A on 2021-04-06 19:48:08 in photon counting mode and collected 7324 s in two different observations. There are three sources within the central part of the field of view, none close to the ASKAP radio position. At the radio position, the 3 sigma 3 XRT upper limit is 2.53E-03 c/s. At the suggested redshift of the host galaxy of z=0.098 (d=454 Mpc, ATel #14516), for a power law spectrum with photon index Gamma=2 and Galactic column density (NH=4.5x10^{21} cm^{-2}), the upper limit on the unabsorbed 0.3-10 keV luminosity is <4.4x10^{42} erg/s. Swift observed the field with UVOT in u band. Summing all the available images we collected 6568 s. The source is not detected with an upper limit of u>22.72 (AB magnitude, 3 arcsec extraction region). The host galaxy reported in ATel #14515 and #14516 has u=22.69+/-0.32 (AB magnitude, 3 arcsec extraction region).
|
2021-04-07 22:18:00
|
radio,optical,x-ray,fast radio burst,transient
|
2021-04-07
|
22:18:00
| 985 |
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] | 14,521 |
14,524 |
Palomar Gattini-IR identification of a likely highly reddened infrared transient counterpart to SRG J181414.6-225604 = SRGe J181415.1-225617
|
K. De (Caltech), V. Karambelkar (Caltech), M. M. Kasliwal (Caltech), M. Hankins (Caltech), J. Jencson (Arizona), J. Sokoloski (Columbia), M. Ashley (UNSW), A. Babul (Columbia), R. M. Lau (ISAS/JAXA), A. Moore (ANU), E. O. Ofek (Weizmann), M. Sharma (Columbia), J. Soon (ANU), R. Soria (NAOC), T. Travouillon (ANU) on behalf of the Palomar Gattini-IR team
|
We report the identification of a likely infrared variable counterpart to the highly reddened X-ray transient SRG J181414.6-225604 = SRGe J181415.1-225617 (ATel #14510). The counterpart was identified in data taken with the Palomar Gattini-IR (PGIR) survey (Moore & Kasliwal 2019) that scans the entire visible sky from Palomar Observatory to a depth of 15.7 AB mag every two nights (De et al. 2020). Within the eROSITA localization region, we find a bright IR source detected in 2MASS and IRAS (as IRAS 1811-2257). Performing forced photometry on the source coordinates in the PGIR images, we find that the source has exhibited large amplitude flares detected since the start of the survey. The source was detected in a high state at J ~ 10.3 mag for 100 days starting from JD ~ 2458550, followed by a fading to J ~ 11.7 mag by JD ~ 2458750. The source remained in the low flux state at J ~ 11.7 mag throughout 2020, before emerging at a magnitude of J ~ 11.3 mag after solar conjunction in April 2021. Since the first two SRG sky surveys in 2020 found the source in a low flux X-ray state (ATel #14510), the brightening of the IR source in 2021 further confirms a temporal association. Together, based on the spatial and temporal coincidence of the variability, we suggest IRAS 1811-2257 as the likely counterpart to SRG J181414.6-225604 = SRGe J181415.1-225617. On UT 2021-04-07, we obtained a very low resolution spectrum of the source using the SED Machine spectrograph (Blagorodnova et al. 2018) on the Palomar 60-inch telescope. The spectrum shows a very red continuum with a very weak emission feature at the wavelength of H alpha. In addition, we detect broad absorption features between 7000 and 9000 A, similar to M-type giants. Using the combined optical and infrared SED of the source, we thus propose that the source is a new Galactic symbiotic X-ray binary. Spectroscopy and multi-wavelength follow-up of the source are encouraged to confirm the nature of the source. An improved X-ray localization could further confirm the association.
|
2021-04-08 01:14:00
|
infra-red,optical,x-ray,binary,cataclysmic variable,neutron star,star,transient,variables,request for observations
|
2021-04-08
|
01:14:00
| 2,052 |
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] | 14,522 |
14,525 |
Observations of FRB 20201124A with Swift/XRT and UVOT
|
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)
|
We observed the location of FRB 20201124A with the Neil Gehrels Swift Observatory under the Swift Guest Investigator program (Program: 1619112, PI: Piro) on April 7, starting at 2021-04-06 19:47:02 UT and ending at 2021-04-07 08:13:59 UT. Observations were carried out with the X-ray Telescope (XRT) in Photon Counting (PC) mode with a total exposure 7294 s. No source was found at the FRB location (ATel #14515) with a 3-sigma upper limit < 1.5e-03 cts/s. The upper limit on the 0.3-10 keV X-ray flux is < 8.8e-14 erg/cm^2/s (unabsorbed) for a power-law with photon index Gamma=2 and Galactic hydrogen column density N_H = 2.9e21 cm^-2 (HI4PI Collaboration et al. 2016). The upper limit to the unabsorbed luminosity (0.3-10 keV) is < 2.2e42 erg/s at the redshift of the proposed host galaxy (z=0.098, ATel #14516) Observations with the Ultraviolet/Optical Telescope (UVOT) were carried out using the u filter with a total exposure 7209 s. Using the UVOT data, we derive a 3-sigma upper limit u > 22.61 AB Magnitude (extracted in a 3" aperture) in the stacked image. Further observations are planned. We thank the Swift team for rapidly approving and scheduling these observations.
|
2021-04-08 01:33:00
|
radio,optical,ultra-violet,x-ray,fast radio burst
|
2021-04-08
|
01:33:00
| 1,181 |
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] | 14,523 |
14,526 |
VLA/realfast localization and deep imaging of FRB 20201124A
|
Casey Law (Caltech), Shriharsh Tendulkar (TIFR/NCRA), Tracy Clarke (NRL), Kshitij Aggarwal (WVU), Suryarao Bethapudy (UT-RGV), realfast collaboration, CHIME/FRB collaboration, VLITE collaboration
|
We report results of new observations of FRB 20201124A (ATels #14497, #14508) with the Karl G. Jansky Very Large Array (VLA). On 2021-04-06, at 23h55m UT, we started a 50 minute observation in a frequency band from 1 to 2 GHz. Visibility data with a sampling time of 10 milliseconds was commensally run through the realfast FRB search system in real time (Law et al 2018).
The realfast system detected one burst with an MJD of 59311.0129359 (topocentric at 2.0 GHz) with SNR=26 and a dispersion measure of 420+-10 pc/cm3. This significance is measured in a single 10-ms image using a band from 1.3 to 1.5 GHz that includes all of the burst emission. We applied gain and flux calibration to the 10 ms image to measure a burst fluence of 2.4+-0.1 Jy ms. The burst position (J2000 epoch) is (RA, Dec) = (5:08:03.50, 26:03:37.8) with an uncertainty of 2" (dominated by estimated systematic error). The VLA and ASKAP localizations are formally inconsistent, and the VLA position is consistent with the optical center of the proposed host galaxy SDSS J050803.48+260338.0 (ATel #14515, #14516).
We have analyzed 5-s visibilities recorded from the same observation to generate a deep image of the FRB field. The VLA antennas are in the compact D configuration (1 km baselines), which has a resolution of 48" at 1.4 GHz and a confusion limit of 170 microJy. The full 1--2 GHz band image shows no source brighter than 500 microJy (3 sigma limit) at the FRB location. This field was also observed in the VLA Sky Survey epoch 1.2 in the 2--4 GHz band. No source is seen at the FRB location brighter than 500 microJy (3 sigma limit).
VLITE-Fast running on the VLA Low-band Ionosphere and Transient Experiment (VLITE, http://vlite.nrao.edu ) commensally searched for the bursts using the incoherently summed (13 antenna) total intensity filterbank data in a 320-361 MHz frequency window. No bursts were found using the standard triggering of S/N>8 for machine learning based follow-up baseband dumps, placing a limit of ~ 40 Jy ms.
|
2021-04-08 02:56:00
|
radio,optical,fast radio burst,transient
|
2021-04-08
|
02:56:00
| 2,020 |
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] | 14,524 |
14,527 |
NICER follow-up of SRGA J181414.6-225604
|
P. M. Bult, K. C. Gendreau (NASA/GSFC)
|
Following the recent report of the detection of a possible new X-ray transient with the SRG observatory (ATel #14510), we executed follow-up observations with the Neutron Star Interior Composition Explorer (NICER). We observed the direction of the reported eRosita coordinates for a total of 11 ks good time exposure, collected between April 5 16:03 UTC and April 6 14:22 UTC. We detect an X-ray source with an average count rate of 2.3 ct/s in the 0.5-10 keV band, which is above the estimated instrument background rate of 0.7 ct/s for the same energy range.
The 0.5-10 keV spectrum shows a prominent soft peak between 0.5-1.5 keV, a hard power law tail above 2 keV, and a spectral emission feature at 6.4 keV. Fitting the higher energy data with an absorbed power law plus Gaussian, we measure an absorption column density of 6.0 +/- 0.5 x1022 cm2, with a photon index of 1.5 +/- 0.2. The Gaussian has a line energy of 6.42 +/- 0.04 keV and an equivalent width of 0.15 +/- 0.07 keV. The unabsorbed 1-10 keV X-ray flux associated with the power law is about 2 x10-11 erg/s/cm2, roughly consistent with the SRG measurement (ATel #14510). The origin of the 0.5-1.5 keV flux excess is not clear at this time, although we suggest it may be due to contamination from a soft background source within NICERs 3 arcmin radius field of view.
Finally, we constructed a power density spectrum for these observations, but did not find any evidence of temporal variability. Instead, the 0.5-10 keV and 2-10 keV power spectra were consistent with Poisson noise for all frequencies above ~1/32 Hz.
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.
|
2021-04-08 06:45:00
|
x-ray,neutron star,star,transient
|
2021-04-08
|
06:45:00
| 1,758 |
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] | 14,525 |
14,528 |
Swift/XRT position of SRGA J181414.6-225604
|
Craig Heinke (Alberta), Tom Maccarone (Texas Tech), G. R. Sivakoff (Alberta), A. Bahramian(Curtin), J. Kennea (Penn State), J. Strader (Michigan State)
|
SRG's ART-XC and eROSITA telescopes recently detected a hard X-ray transient, SRGA J181414.6-225604, in the Galactic Bulge (ATel #14510), which was also detected by NICER (ATel #14527). The Palomar Gattini-IR survey detected rapid infrared variability from a bright (2MASS K_s=6.2) red (J=8.3) star in the error circle (ATel #14527), which was also coincident with IRAS 1811-2257. The WISE colors of this object (W1=5.47+-0.06,W2=4.87+-0.03, W3=3.99+-0.01 and W4=3.24+-0.02) also mark the object as unusually red, probably due to local dust (likely marking the object as a D-type symbiotic X-ray binary).
We report a Neil Gehrels Swift Observatory X-ray Telescope observation on April 7, 2021, of 895 seconds in photon-counting mode. One source is detected in the field, with a countrate of 0.06 counts/s (about 55 counts). The J2000 position of this source, using the Leicester tools for enhanced X-ray positions (Evans et al. 2009, MNRAS, 2009, 397, 1177) is: RA: 18 14 14.77 Dec: -22 56 20.2, with an error radius of 3.0â (at 90% confidence). Simultaneous Swift UVOT observations place an upper limit of 19.7 (Vega) mag in the UW1 band.
The X-ray position is 0.8â away from the position of the suggested variable infrared counterpart from ATel #14257, which was identified with IRAS 1811-2257 / 2MASS J18141475-2256195. This strongly supports the identification of the SRG X-ray transient with the variable infrared source.
An absorbed power-law model reasonably fits the Swift/XRT spectra, with N_H=(3+3/-2)*1e22, photon index of 1.0+1.1-0.9, and an unabsorbed 0.3-10 keV flux of (1.1+1.0/-0.3)*1e-11 erg/cm^2/s (90% confidence intervals). This is roughly consistent with the SRG and NICER flux estimates, and with a luminosity of about 8e34 (d/ 8 kpc)^2 erg/s.
We thank the Swift team for the rapid scheduling of this observation.
|
2021-04-08 09:27:00
|
optical,x-ray,binary,star,transient,variables
|
2021-04-08
|
09:27:00
| 1,843 |
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] | 14,526 |
14,529 |
uGMRT detection of a persistent radio source coincident with FRB20201124A
|
Robert Wharton (MPIfR), Suryarao Bethapudi (MPIfR), Tasha Gautam (MPIfR), Dongzi Li (Caltech), Hsiu-Hsien Lin (CITA), Robert Main (MPIfR), Viswesh Marthi (NCRA), Laura Spitler (MPIfR), Ue-Li Pen (CITA)
|
Based on the initial ASKAP localization of the newly active repeater FRB20201124A (ATels #14497, #14508), we conducted observations with the upgraded Giant Metrewave Radio Telescope (uGMRT) at 550-750 MHz between UTC 2021-04-05T12:30:00 and 2021-04-05T16:45:00 with a total on-source exposure of 3.0 hr. We have analyzed 40 min of data starting from UTC 2021-04-05T13:46:33.2. An unresolved persistent radio source with a 650 MHz flux density of 0.7 +/- 0.1 mJy is found at a position (epoch J2000) of (RA, Dec) = (05:08:03.43, +26:03:38.5) with a 5 sigma positional uncertainty of about 0.9 arcsec. This persistent radio source is coincident with both the VLA/realfast burst position (ATel #14526) and the location of the galaxy SDSS J050803.48+260338.0 (ATel #14516), but offset by about 3.5 arcsec from the latest ASKAP burst position (ATel #14515). Since the source was not detected at 1400 MHz in the VLA/realfast image (3 sigma upper limit of 0.5 mJy), the spectral index of the source must be steeper than -0.4. We encourage higher resolution interferometric observations of this source to better determine its relationship to the bursts and the SDSS galaxy.
In addition to standard interferometric visibilities, we also recorded channelized time series data from the incoherently summed array to search for bursts. The incoherent beam data from this observation yielded many (>30) burst detections. Analysis of the localization, TOAs, and fluences of these bursts is in progress.
Below is a link to our 650 MHz map showing the persistent radio source with the 5 sigma source position uncertainty (black), the ASKAP (green) and VLA/realfast (cyan) burst localizations, the location of SDSS J050803.48+260338.0 (blue cross), and the uGMRT synthesized beam shape (white).
|
2021-04-08 22:39:00
|
radio,fast radio burst
|
2021-04-08
|
22:39:00
| 1,778 |
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] | 14,527 |
14,530 |
Early NuSTAR and Swift X-ray detection of Nova Cassiopeiae 2021 = V1405 Cas = PNV J23244760+6111140
|
K. V. Sokolovsky, E. Aydi, L. Chomiuk, A. Kawash, J. Strader (MSU), K. Mukai (NASA/GSFC), K.-L. Li (NCKU), A. Babul, J. L. Sokoloski (Columbia), J. D. Linford (NRAO), N. Ikonnikova, K. E. Atapin, A. A. Belinski, A. V. Dodin, N. A. Maslennikova, K. A. Postnov, S. A. Potanin, B. S. Safonov, N. I. Shatsky, A. M. Tatarnikov (SAI MSU), K. L. Page (U. Leicester), O. V. Maryeva (ASU and SAI MSU)
|
V1405 Cas (Nova Cas 2021, PNV J23244760+6111140) was discovered on t0 = 2021-03-18.4236 UT by Y. Nakamura and confirmed spectroscopically as a He/N-type nova (CBET #4945, ATel #14471, #14472, #14476, #14478, #14482). Its position 23:24:47.745 +61:11:14.82 +/-0.1" J2000 measured with the 0.6m SAI Moscow State University telescope (Kislovodsk, Russia) coincides with a previously known variable star CzeV3217 (possibly a novalike misclassified as W UMa-type binary) at the Gaia distance of 1740 pc (Bailer-Jones et al. 2018, AJ, 156, 58).
NuSTAR performed a 40ks DDT observation of V1405 Cas between 2021-03-20.9548 (t0 + 2.5 days) and 2021-03-21.6111. We found a faint X-ray source at the nova position (4 and 5 sigma detection with the focal plane modules A and B, respectively). The source spectrum can be fit by a kT= 1.8 +/-0.6 keV thermal plasma with unconstrained absorption and the unabsorbed flux in the NuSTAR 3.5-78.0 keV band of 8.8x10^-14 erg/cm^2/s corresponding to an intrinsic luminosity of 3.2x10^31 erg/s (2.7x10^32 erg/s if extrapolated to 0.3-78.0 keV).
Swift/XRT observed V1405 Cas for 0.3ks on 2021-03-24.064 (t0 + 5.6 days) and detected an X-ray source at the nova position with the net count rate of 0.043 +/-0.013 cts/s. The 0.3-10 keV spectrum is consistent with kT= 0.7 +/-0.3 keV thermal plasma assuming nH= 3.768x10^21 cm^-2 estimated from the nH to optical reddening relation (ATel #14476; Guver & Ozel 2009, MNRAS, 400, 2050).
We obtained optical spectroscopy of V1405 Cas with the 2.5m SAI MSU telescope (Kislovodsk, Russia) on 2021-03-19.762, 2021-03-23.050, 2021-04-01.718 using the Transient Double-beam Spectrograph (Dodin et al. 2020, AstL, 46, 429). The spectral resolution R=1200-2200 for the blue and red arms of the spectrograph together covering the range 3500-7500 A. We also obtained two spectra covering 8400-8870 A range on 2021-03-25 and 2021-04-04 with the Perek 2m telescope of Astronomical Institute (Ondrejov, Czech Republic). The spectra show P Cygni profiles of Balmer and He I lines, with absorption troughs at velocities of around -1200 km/s, relative to the rest velocities of the lines. The spectra are consistent with a nova that did not reach optical peak.
We expect that as the nova approach the peak, the high excitation He I lines fade while lower ionization Fe II lines dominate the spectrum. A broader spectral components may emerge when the nova reach optical peak, originating in fast winds/outflows. This anticipated optical peak is driven by shocks - the product of collision between the different outflows (Munari et al. 2017, MNRAS, 469, 4341; Aydi et al. 2020, ApJ, 905, 62). These shocks may lead to gamma-ray emission.
We found V1405 Cas an order of magnitude less luminous in the NuSTAR band compared to YZ Ret (ATel #13900) and two orders of magnitude less luminous than V906 Car (Sokolovsky et al. 2020, MNRAS, 497, 2569) and V5855 Sgr (Nelson et al. 2019, ApJ, 872, 86) - the three gamma-ray bright classical novae previously observed by NuSTAR 10 to 57 days past eruption. Although only a few photons from V1405 Cas were detected by Swift/XRT, this detection suggests the intrinsic absorption is not important, in stark contrast to the early NuSTAR spectra of YZ Ret, V906 Car and V5855 Sgr. The origin of these relatively unabsorbed X-rays in a nova, that may have not reached its peak (according to the optical spectra), is currently unclear.
|
2021-04-09 00:01:00
|
infra-red,optical,x-ray,gamma ray,binary,nova,star,transient,variables
|
2021-04-09
|
00:01:00
| 3,427 |
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] | 14,528 |
14,531 |
MASTER OT J031055.01+472216.3: young SN in PGC2297096 or CV
|
K. Zhirkov, P. Balanutsa, V. Lipunov, V. Kornilov (Lomonosov MSU), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), R. Podesta, F. Podesta, C. Francile (OAFA), D. Buckley (SAAO), E. Gorbovskoy, O. Gress, N. Tiurina, F. Balakin, V. Vladimirov, A. Kuznetsov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, A. Chasovnikov, A. Pozdnyakov, V. Topolev, D. Cheryasov, V. Shumkov, T. Pogrosheva (Lomonosov Moscow State University, SAI, Physics Department), N. M. Budnev (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveshchensk State Pedagogical University)
|
MASTER OT J031055.01+472216.3 discovery - PSN in 3.2"E, 24.1"S of PGC2297096 or CV
MASTER-Tavrida auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 03h 10m 55.01s +47d 22m 16.3s on 2021-04-02.78472 UT. The OT unfiltered magnitude is 16.6m (mlim=17.1). The OT is seen in 2 images. There is no minor planet at this place. We have reference image at 2021-03-30 18:17:52UT with mlim=18.0, at 2018-10-06.08660 UT with unfiltered mlim= 20.0m. This PSN is in .2"E, 24.1"S of disc galaxy PGC2297096 (Btc=15.09, distance is unknown) Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/031055.01472216.3.png
|
2021-04-09 00:38:00
|
optical,cataclysmic variable,planet,supernovae,variables,request for observations
|
2021-04-09
|
00:38:00
| 760 |
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] | 14,529 |
14,532 |
MASTER follow-up optical observation of FRB201124A
|
K. Zhirkov, V. Lipunov, V. Kornilov (Lomonosov MSU), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), R. Podesta, F. Podesta, C. Francile (OAFA), D. Buckley (SAAO), E. Gorbovskoy, P. Balanutsa, O. Gress, N. Tiurina, F. Balakin, V. Vladimirov, A. Kuznetsov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, A. Chasovnikov, A. Pozdnyakov, V. Topolev, D. Cheryasov, V. Shumkov, T. Pogrosheva (Lomonosov Moscow State University, SAI, Physics Department), N. M. Budnev (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveshchensk State Pedagogical University)
|
MASTER-Net reports on the optical observations of FRB201124A during its high activity phase (ATels #14497, #14502, #14508). We observed the source on the 2021-03-31from 17:14:11 to 00:15:49 UTC, on the 2021-04-01 from 17:10:21 to 23:51:42 UTC, on the 2021-04-06 from 20:46:35 to 21:57:50 UTC and on the 2021-04-07 from 20:54:35 to 22:02:16 UTC. Observations were made with no filter and the exposure times of 180s and 10s. On some of our frames we clearly see the host galaxy(ATels #14515, #14518, #14526) with the magnitude of W=19.0+/-0.2, which is consistent with our archival observation on 2010-11-07 with the magnitude of W=19.5+/-0.3. We detect neither significant brightening of the galaxy or FRB-like bursts(1-2 bright pixels) in the localization region. From this we derive that a 3-sigma upper limit for the persistent source is W=19.3 and for FRB-like bursts 5-sigma upper limit for fluence is 3.3 Jy ms. MASTER will continue observations of this source. We encourage further multiwavelength observations of the FRB201124A during its high activity phase.
|
2021-04-09 01:20:00
|
radio,optical,fast radio burst,request for observations
|
2021-04-09
|
01:20:00
| 1,066 |
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] | 14,530 |
14,533 |
Spectroscopic follow up of the classical nova V6595 Sgr (PNV J17581670-2914490)
|
E. Aydi, J. Strader, L. Chomiuk, K. V. Sokolovsky, A. Kawash (MSU), K-L Li (NCKU), D. A. H. Buckley (SAAO), M. Orio (INAF/UoW), K. Mukai (NASA Goddard), J. Linford (NRAO), and J. Sokoloski (Columbia Univ.)
|
We report on spectroscopic follow up of the classical nova V6595 Sgr (PNV J17581670-2914490), which was discovered by Andrew Pearce on 2021-04-04.8 UT and confirmed spectroscopically by Kenta et al. (2021, ATels #14513 and #14514). On 2021-04-06.1 we obtained several low- and medium-resolution spectra of V6595 Sgr using the Goodman spectrograph (Clemens et al. 2004, SPIE, 5492, 331) on the 4.1m SOAR telescope, covering a wavelength range of 4000-7800 A. We also obtained a 600s high-resolution spectrum on 2021-04-06.9 using the High Resolution Spectrograph (HRS; Crause et al. 2014, Proc. SPIE, 91476) mounted on the 11m Southern African Large Telescope as part of the SALT Large Science Program on Transients. The observations were taken in the HR mode of HRS which covers the spectral range of 3800-8900 A at a resolution of R=67000. The data were reduced with the SALT HRS MIDAS pipeline (Kniazev et al. 2016, MNRAS 459, 3068).
The SOAR spectra show a red continuum with P Cygni profiles of H-Balmer, Fe II, and O I, with absorption troughs at around -1100 km/s relative to the rest velocities of the lines. The emission components of most of the P Cygni profiles are weak relative to the continuum, which means that the nova was at or near optical peak. The SALT spectrum, taken less than a day later, shows significant changes with broad emission lines emerging, characterized by a FWZI of more than 6000 km/s. The Previous lower velocities features are superimposed on top of the broader emissions, which is consistent with the spectral evolution described in Aydi et al. (2020, ApJ, 905,62). The emergence of broad emission component with the slow P Cygni feature on top of it indicates that by the time the SALT spectrum was taken, the nova has passed optical peak. The ASAS-SN photometry (see below) shows indeed that the nova reached optical peak on 2021-04-06.2.
The Na D interstellar absorptions show multiple components at velocities of 0, -30, -60, -115, -195 and -215 km/s, consistent with high extinction towards the line of sight. The equivalent width of the lower velocity components exceeds 1 Angstrom but these lines are saturated. We used several diffuse interstellar bands to derive an estimate of the reddening. Using these lines and the relations from Frideman et al. (2011, ApJ, 727, 33) we derive E(B-V) = 0.65 and Av = 2, assuming an extinction law Rv = 3.1. This is consistent with the reddening estimated from the Galactic reddening maps of Schlafly et al. (2011, ApJ, 737, 13) but inconsistent with the multiple Na D interstellar components and the red spectral continuum near peak.
The latest ASAS-SN sky patrol (Kochanek et al. 2017, PASP, 129, 4502) light curve: https://asas-sn.osu.edu/sky-patrol/coordinate/d34adb0a-ae8c-416e-9328-f8bb4b8c5aa0
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).
|
2021-04-09 03:39:00
|
optical,binary,cataclysmic variable,nova,transient,variables
|
2021-04-09
|
03:39:00
| 3,181 |
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] | 14,531 |
14,534 |
NIR photometry of the FSRQ 5C12.291
|
L. Carrasco, A. Porras, G. Escobedo, E. Recillas (INAOE, Mexico)
|
Following the report in ATel # 14311, of enhanced Gamma Ray activity of the source 4FGLJ1308.5+3547, cross correlated with the FSRQ5C12.291 and the NIR source 2Mass13082370+3546373, we carried out observations of the source in the H bandpass on March 23,2021 (JD2459296.014676),finding that source was in a flaring state. The photometry yielded a value H = 13.879 +/- 0.045 an increase by a factor 7.3 with respect to the value found by 2Mass. Our observations are carried out with the 2.1m telescope of the Guillermo Haro Observatory, equipped with CANINA, a NIR camara, located at Cananea, Sonora, Mexico. We recommend further multi wavelength observations.
|
2021-04-09 05:55:00
|
radio,infra-red,gamma ray,agn,blazar,quasar
|
2021-04-09
|
05:55:00
| 659 |
[
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] | 14,532 |
14,535 |
Swift upper limit on early X-ray emission of Nova Sagittarii 2021 No. 2 = V6595 Sgr = PNV J17581670-2914490
|
Kirill Sokolovsky, Elias Aydi, Laura Chomiuk, Adam Kawash, Jay Strader (MSU), Koji Mukai (NASA/GSFC), Kwan-Lok Li (NCKU)
|
The eruption of V6595 Sgr (Nova Sgr 2021 No. 2, PNV J17581670-2914490) was first noted by A. Pearce on DSLR images obtained on 2021-04-04.825 UT. The object was spectroscopically confirmed as a classical nova (CBET #4952, ATel #14513, #14533). The latest pre-discovery image of the nova field was obtained on 2021-04-02.776 by R. McNaught.
Swift observed V6595 Sgr for 2.0ks split between the two pointings centered on 2021-04-05.7821 and 2021-04-05.8606, 23 and 25 hours post-discovery, respectively. The nova is clearly visible in Swift/UVOT images having the following UVW2 (Vega) magnitudes:
The Swift/UVOT nova position measured with respect to UCAC3 star in the field is 17:58:16.09 -29:14:56.3 +/-0.2" J2000.
Swift/XRT detected no X-ray source at the position of the nova with a one-sigma upper limit of 0.003 cts/s. Assuming kT= 2 keV thermal plasma emission and HI column density of 3.46x10^21 cm^-2 (Kalberla et al. 2005 A&A, 440, 775) this translates to the unabsorbed 0.3-10.0 keV flux limit of 2x10^-13 erg/cm^2/s.
We thank the Neil Gehrels Swift Observatory team and PI, Brad Cenko, for rapid scheduling these ToO observations.
|
2021-04-09 15:46:00
|
ultra-violet,x-ray,nova,star
|
2021-04-09
|
15:46:00
| 1,145 |
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] | 14,533 |
14,536 |
Swift Bulge Survey: Discovery of a new X-ray transient, Swift J174038.1-273712
|
Bahramian, A. (Curtin U.), Heinke, C. O. (U. Alberta), Maccarone, T. J. (Texas Tech), Shaw, A. W. (U. Nevada, Reno), Wijnands, R. (U. Amsterdam)
|
The Swift Bulge Survey performs biweekly mapping of 16 square degrees of the Galactic Bulge with short (~120 s) X-ray observations (Shaw et al. 2020, MNRAS, 492, 4344; Bahramian et al. 2021, MNRAS, 501, 2790).
The most recent epoch of this survey, performed on April 9th, 2021, reveals a new X-ray transient, Swift J174038.1-273712 with a Swift/XRT countrate of 0.25 ct/s (31 counts in 117 s, 0.5-10 keV). Using the online Swift/XRT products tool (Evans et al. 2009, MNRAS, 2009, 397, 1177) yields enhanced coordinates of the source as:
RA: 17h 40m 38.11s Dec: -27d 37m 12.1s
with a radial uncertainty of 3.4 arcsec (90% confidence). We found no previously cataloged X-ray sources consistent with these coordinates.
Fitting the X-ray spectrum of the source with an absorbed power-law and Galactic N_H of 5.5e21 cm^-2, and using W-statistics (Cash 1979, ApJ 228, 939), indicates a power-law photon index of 1.2+/-0.6, and an unabsorbed flux of 3.2(-1.1/+2.3)e-11 erg/s/cm2 in the 0.5-10 keV band. Assuming a d=8 kpc , the X-ray luminosity would be ~2e35 erg/s (in the 0.5-10 keV band). A substantially larger N_H and softer spectrum are found when N_H is allowed to float freely, which may be due to the low total number of counts, but hints at a quasi-thermal spectrum.
The source is in the region of the Chandra Galactic Bulge Survey (Jonker et al. 2011,ApJS,194,18), but was not detected by that survey, which has limits of 8e-14 erg/s/cm^2 for N_H=10^22 and Gamma=2 power law models.
VVV reveals a moderately bright star (J=14.3, K=12.8) within the error circle, also detected by VPHAS+ with r=19.5. VLASS shows no source in the error circle.
Further Swift follow up observations have been requested. Multi-wavelength follow ups are encouraged. We thank the Swift team for their support of these observations, which are ongoing.
|
2021-04-09 20:15:00
|
x-ray,binary,star,transient,request for observations
|
2021-04-09
|
20:15:00
| 1,838 |
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] | 14,534 |
14,537 |
Radio observations of FRB20201124a at 4-8 GHz with the 100-m Effelsberg Radio Telescope
|
Laura Spitler (MPIfR), Henning Hilmarsson (MPIfR)
|
We report observations with the 100-m Effelsberg radio telescope at 4-8 GHz of FRB20201124a (ATel #14497). The observations began at 15:32:36 UTC on 7 April 2021 (MJD 58946) and continued for a total of 21600 s. The telescope was pointed at the interferometrically determined source position from ASKAP (ATel #14515). Total intensity filterbank data were recorded in two adjacent 2 GHz bands with 2048 channels each and a time resolution of 131 us.
The data were searched for single pulses using HEIMDALL and PRESTO with a S/N threshold of 8 over a DM range between 400 and 430 pc/cc. Candidates were classified using FETCH as well as being visually inspected. No single pulses were found in the data.
We place a fluence upper limit of 0.07 Jy ms, assuming a minimum S/N threshold of 8, 4 GHz of bandwidth, and a fiducial burst duration of 1 ms. Previous observations placed a fluence limit of 5.4 Jy ms at 2.26 GHz (ATel #14519). Our observations significantly deepen the fluence limit on emission at higher radio frequencies and suggest that bursts with fluences greater than roughly 0.1 Jy ms in the 4-8 GHz band are rare. Therefore, we recommend that future observations searching for bursts will be more fruitful at lower radio frequencies.
|
2021-04-09 21:45:00
|
radio,fast radio burst
|
2021-04-09
|
21:45:00
| 1,247 |
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] | 14,535 |
14,538 |
uGMRT localization of FRB20201124A
|
Robert Wharton (MPIfR), Suryarao Bethapudi (MPIfR), Viswesh Marthi (NCRA), Robert Main (MPIfR), Dongzi Li (Caltech), Tasha Gautam (MPIfR), Hsiu-Hsien Lin (CITA), Laura Spitler (MPIfR), Ue-Li Pen (CITA)
|
As reported in Atel #14529, we conducted observations towards the location of FRB20201124A with the upgraded Giant Metrewave Radio Telescope (uGMRT) at 550-750MHz and detected 35 bursts above a fluence of ~5 Jy ms in a 3 hr exposure. The brightest burst, detected at UTC 2021-04-05T14:39:57.856, has a fluence of 111+/- 6 Jy ms, more than twice as energetic as any other single burst. Using this burst, we have localized the FRB source to a position (epoch J2000) of (RA, Dec) = (05:08:03.459, +26:03:39.14). The 5 sigma statistical uncertainty of the position is 0.5 arcsec for RA and 0.25 arcsec for Dec. We do not include systematic effects here, but they should be less than 1 arcsec. This burst position is consistent with the VLA/realfast localization (ATel #14526) and the location of the persistent radio source (PRS) we reported (Atel #14529). However, it is offset by 2.8 arcsec from the ASKAP burst position (ATel #14515).
In addition to the brightest burst above, the other 34 detected bursts had fluences between 5-50 Jy ms, with an average of ~16 Jy ms. Averaging all of the bursts over the 3 hr exposure would result in a 50 uJy source. Thus we find it unlikely that the PRS is the average result of many bursts, unless there are thousands of undetected bursts below 5 Jy ms.
Below is a link to our 550-750 MHz images overplotted with the uGMRT localized FRB20201124A burst position with 5 sigma statistical uncertainty (magenta), PRS position with the 5 sigma statistical uncertainty (black), the ASKAP (green) and VLA/realfast (cyan) burst localizations, and the location of SDSS J050803.48+260338.0 (blue cross). The left panel shows the PRS integrated over a 40 minute scan, while the right panel shows the burst in a 3 second integration.
Persistent radio source and burst localization
The brightest burst, detected in a 3 sec image with a S/N of ~40, is shown here.
Burst image detection
The waterfall plots of the detected bursts can be found in the link below. Time samples and channel widths are 655.36 us, 781.25 kHz respectively, and bursts are de-dispersed to DM=411.0 pc/cc. Burst 14 was used for localization imaging.
Waterfall plots of the detected bursts
|
2021-04-10 00:22:00
|
radio,fast radio burst
|
2021-04-10
|
00:22:00
| 2,192 |
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] | 14,536 |
14,539 |
ZTF detects an optical brightening of Swift J1357.2-0933
|
Eric C. Bellm (UW) on behalf of the Zwicky Transient Facility collaboration
|
We report discovery of an optical brightening of the black hole candidate Swift J1357.2-0933 (Krimm et al. 2011, ATel #3138) with the Zwicky Transient Facility (ZTF; Bellm et. al 2019, Graham et. al 2019). The last outburst from this source occurred in 2019 (van Velzen et al. 2019, ATel #12796). ZTF detected the object (internally designated ZTF19aanxwrq) with difference imaging at m_g ~ 18.7 on 2021-04-10.38. No source was detected in images taken on 2021-04-07.3 to limiting magnitudes of m_g ~ 19.5, m_r ~ 20.4. Forced photometry at this epoch provides a 4-sigma detection at m_r = 21.1, indicating that the source was near quiescence at this time. We identified the outburst using a watchlist of known X-ray binaries hosted by the ANTARES alert broker (Matheson et. al 2020). Public data for this object can be retrieved at https://antares.noirlab.edu/loci/ANT2019qwjh2 Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-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, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW. The ZTF forced-photometry service was funded under the Heising-Simons Foundation grant #12540303 (PI: Graham). We acknowledge further support from the NSF under grants AST-1812779 and the Heising-Simons Foundation under grant 2018-0908.
|
2021-04-11 09:00:00
|
optical,x-ray,binary,black hole,transient
|
2021-04-11
|
09:00:00
| 1,790 |
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] | 14,537 |
14,540 |
Detection of enhanced emission above 100 MeV, using Fermi-LAT data, associated with the PSR B1259-63/LS 2883 binary system approximately 60 days after periastron
|
T. J. Johnson (GMU, resident at NRL), G. Marti-Devesa (Univ. of Innsbruck), and C. C. Cheung (NRL), on behalf of the Fermi Large Area Telescope Collaboration
|
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced emission, on a one-day time scale, associated with the PSR B1259-63/LS 2883 binary system, 60 days after periastron.
Analyzing the LAT data in the region around PSR B1259-63 over the time interval 2021-04-04 00:00:00 to 2021-04-11 03:24:40 UTC, assuming a photon index of 2.8 based on previous periastron passages, we derived the 100 MeV to 300 GeV flux in one-day bins for PSR B1259-63. We find no significant detection from 2021-04-04, 05, 06, or 09, with 95% confidence level upper limits on the flux ranging from 0.7 to 0.8 x 10^-6 ph/cm^2/s. For 2021-04-07 and 08, we find low-significance detections (~3 sigma) with flux values of (0.8 +/- 0.4) x 10^-6 ph/cm^2/s and (0.8 +/- 0.6) x 10^-6 ph/cm^2/s, respectively. For the last bin in our analysis, 2021-04-10 to 2021-04-11 03:24:40 (spanning 1.14 days), we find a ~4 sigma detection with a flux of (1.2 +/- 0.3) x 10^-6 ph/cm^2/s, possibly indicative of the start of the expected intense post-periastron flaring period. All quoted uncertainties are statistical only.
The Fermi-LAT has observed enhanced emission following the three previous periastron passages of PSR B1259-63. The delay between periastron and onset of emission increased each time, from 30 days in 2010 to 32 days and 40 days in 2014 and 2017, respectively. If this passage follows the same pattern, the emission we have detected could be the start of a longer, flaring episode.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. In consideration of the expected ongoing activity of this source we strongly encourage multi-wavelength observations. PSR B1259-63 is included in the "LAT Monitored Sources" and consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT is publicly available ( https://fermi.gsfc.nasa.gov/ssc/data/access/lat/msl_lc/source/PSR_B1259-63 ). For this source the Fermi LAT contacts are Tyrel Johnson ([email protected]) and Kent Wood ([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.
|
2021-04-12 13:38:00
|
gamma ray,binary,pulsar
|
2021-04-12
|
13:38:00
| 2,424 |
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] | 14,538 |
14,541 |
SN 2021hpr: prediscovery detection and follow-up observations
|
D. Yu. Tsvetkov, N. N. Pavlyuk, N. P. Ikonnikova, M. A. Burlak, A. A. Belinski (Sternberg Astronomical Institute, Lomonosov Moscow State University)
|
SN 2021hpr was detected in images obtained with the RC600 60-cm telescope of the Caucasian Mountain Observatory of SAI MSU in the Vgri bands on March 31.92 UT, about 8 hours earlier than the first detection reported by ZTF via TNS. The follow-up observations were carried out with the RC600 telescope in the UBVgri bands and with the 70-cm telescope of SAI MSU in Moscow in the UBVRI filters. The results are presented in the Table below:
We continue monitoring of SN 2021hpr, which is the fourth SN Ia discovered in NGC 3147.
|
2021-04-12 23:07:00
|
optical,supernovae
|
2021-04-12
|
23:07:00
| 527 |
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] | 14,539 |
14,542 |
MASTER OT detections in Gagarin Day
|
P. Balanutsa, K. Zhirkov, T. Pogrosheva, V. Lipunov, V. Kornilov, O. Gress, I. Gorbunov, E. Gorbovskoy, N. Tyurina, A. Kuznetsov, F. Balakin, V. Vladimirov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, V. Shumkov, A. Chasovnikov, E. Minkina, V. Topolev, A. Pozdnyakov, V. Grinshpun, D. Kuvshinov (Lomonosov Moscow State University), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University), R. Podesta, C. Lopez, F. Podesta, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), N. Budnev, O. Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)
|
MASTER OT J032127.50-334440.6 discovery - outburst with ampl>3.1m MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 03h 21m 27.50s -33d 44m 40.6s on 2021-04-03.97804 UT.
The OT unfiltered magnitude is 17.6m (mlim=18.7). The OT is seen in 5 images. There is no minor planet at this place. We have reference image on 2016-12-30.15194 UT with unfiltered mlim=20.7m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/032127.50-334440.6.png
MASTER OT J134120.04+014648.7 discovery - outburst with ampl>2.4m MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 13h 41m 20.04s +01d 46m 48.7s on 2021-04-09.14301 UT. The OT ufiltered magnitude is 18.6m (mlim=19.6). The OT is seen in 3 images at MASTER-OAFA and 1 image at MASTER-IAC at 2021-04-05 03:25:52UT with m_OT=17.8. There is no minor planet at this place. We have reference images in MASTER database at 2019-05-10.22595 UT with unfiltered mlim=19.7m, with mlim=20.2 at 2015-02-21 20:21:20UT. Spectral observations are required. The detection and reference images are available at: http://master.sai.msu.ru/static/OT/134120.04014648.7.png This OT was known as PanSTARRs PSN AT2017drb
|
2021-04-13 05:27:00
|
optical,cataclysmic variable,planet,transient,variables,request for observations
|
2021-04-13
|
05:27:00
| 1,328 |
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] | 14,540 |
14,543 |
Two Outbursts of Comet 29P/Schwassmann-Wachmann 1
|
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 and GROWTH India Collaborations
|
We report on observations of two outbursts of comet 29P/Schwassmann-Wachmann 1 based on SDSS r'- and ZTF r-band images using the GROWTH India Telescope (GIT) and Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002). Nightly averaged photometry of comet 29P was measured within circular apertures of radius 5.7" and calibrated to the PS1 magnitude system. The data are tabulated below along with heliocentric distance (rh), observer-comet distance (delta), and point-to-point variation in magnitude (dm).
The first event is small, observed as a change in apparent brightness from r=17.00 +/- 0.03 to 16.80 +/- 0.03 mag between 2021-03-23.128 and 25.129 UTC, indicating an outburst strength of -0.20 +/- 0.04 mag. The outburst is clearly seen as a compact source in images on Mar 25 and 29, after subtracting the image taken on Mar 23.
The second outburst was observed with GIT and ZTF. The combined photometry show the coma near quiescence with a brightness of r=16.98 +/- 0.06 and 17.17 +/- 0.07 mag on 2021 Mar 31.148 and 31.602 UTC, respectively. By our next epoch of photometry, on Apr 01.604 UTC, the comet had brightened to r=15.70 +/- 0.05 mag, indicating an outburst strength of -1.38 +/- 0.07 mag.
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, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the 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).
|
2021-04-13 07:12:00
|
optical,comet,planet(minor),planet,transient
|
2021-04-13
|
07:12:00
| 2,422 |
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] | 14,541 |
14,544 |
Spectroscopic classification of ASASSN-21fh as a classical nova of the Fe II class
|
Vishal Joshi, Sandipan Borthakur, Dipankar P K Banerjee, Mudit K. Srivastava (Physical Research Laboratory, Ahmedabad, India)
|
We report optical spectroscopy of ASASSN-21fh, suspected to be a Possible Galactic Nova in Scorpius. The transient was discovered at mag 11.1 by the All-Sky Automated Survey for Supernovae (ASAS-SN) on 2021 04 12.168 UT and reported by Patrick Schmeer in VSNET-Alert 25711 (https://www.aavso.org/vsx/index.php?view=detail.top&oid=2217653). ASAS-SN g mag was 10.4 on 2021 04 12.407 UT. We obtained optical spectra of ASASSN-21fh on 2021 04 12.916 UT using the Mt. Abu Faint Object Spectrograph and Camera - Pathfinder (MFOSC-P) on the PRL 1.2m Telescope at Mt. Abu observatory. The observations were acquired in partially cloudy conditions. The spectra were recorded in two modes; low-resolution mode with R ~ 500 covering the 4400-9000 AA in two settings of the grating and an R ~ 2000 mode covering ~ 6100-7100 AA. The spectrum shows a red continuum with P Cygni profiles of H-Balmer, Fe II, and O I lines. The emission components of most of the P Cygni profiles are weak relative to the continuum except H alpha and H beta lines. The FWHM and FWZI of the H-alpha emission component are ~ 2380 and 3800, respectively derived from R 2000 spectrum. The absorption troughs of P Cygni blue shifted by ~ 2200, 1665, and 1620 km/s relative to the rest velocities for H alpha, H beta, and OI 7773A lines, respectively (profiles not deconvolved for instrumental broadening). On the basis of large outburst amplitude (> 6.5 mag) and H-Balmer and Fe II lines with P Cygni feature, we classify the transient to be a classical nova of the Fe II class caught early in its outburst.
|
2021-04-13 09:36:00
|
optical,nova,supernovae,transient
|
2021-04-13
|
09:36:00
| 1,569 |
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] | 14,542 |
14,545 |
NICER observations the new X-ray transient SWIFT J174038.1-273712
|
A. Sanna (Univ. Cagliari), D. Altamirano (Univ. of Southampton), K. C. Gendreau (NASA/GSFC), L. Burderi, A. Riggio (Univ. Cagliari), T. Di Salvo (Univ. Palermo), G. K. Jaisawal (DTU Space), M. Ng (MIT)
|
Following the discovery of the new X-ray transient SWIFT J174038.1-273712 by the Neil Gehrels Swift Observatory (ATels #14536), we triggered observations with the Neutron Star Interior Composition Explorer (NICER) that started on 2021 April 9 at 14:52 UT (total exposure of ~27 ksec).
NICER's average source count rate was 4.2 cts/sec (0.5-10 keV). The 0.5-10 keV power spectrum does not present significant periodic or quasi-periodic signals in the frequency range 0.005Hz - 2.500 Hz. The power spectrum shows low-frequency variability (red noise) with a fractional rms amplitude of 28+/-1% (0.5-10 keV as measured in the 0.007-1.7 Hz range).
The continuum X-ray spectrum extracted from the NICER data in the 0.5-10 keV energy range is well described (red. chi^2 1.24 for 639 d.o.f.) by an absorbed blackbody and a thermally comptonized continuum ((Tbabs(bbody+nthcomp) in XSPEC). The absorption column density derived from the spectral fit is N_H = 0.93(2)E22 cm^-2. The blackbody component is described by a temperature kT=0.39(2) keV while the thermally comptonized component is characterized by a photon index Gamma=2.3(3) produced by an electron population with temperature kTe<=4 keV and seed photon temperature linked to the blackbody component. There is marginal evidence of a broad (sigma 0.54(13) keV) Fe line feature at 6.64(14) keV. The absorbed 0.5-10 keV source flux is 1.5(2)E-11 erg cm^-2 s^-1, that implies a relatively low-luminosity (L~2e35 erg/s) system, even assuming a source distance of 10 kpc.
Currently, the temporal and spectral properties of SWIFT J174038.1-273712 do not allow us to unambiguously identify the compact object's nature in the binary X-ray system. The observed source flux is either compatible with the beginning/ending of a standard outburst from a Low-mass X-ray binary or the beginning of the outburst of a so-called very faint X-ray transient (Wijnands et al. 2006, A&A, 449, 1117). 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.
|
2021-04-14 04:03:00
|
x-ray,binary,neutron star,star,transient
|
2021-04-14
|
04:03:00
| 2,196 |
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] | 14,543 |
14,546 |
Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
|
K. Taggart, C. Rojas-Bravo, R. J. Foley (UCSC), C. R. Angus (DARK)
|
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. The targets were supplied by ALeRCE and Fink (selected from the ZTF data stream) and ATLAS. All Observations were made on 2021 Apr 13 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 find good template fits with SNe Ib at z~0.02. The SN redshift is consistent with NGC 4923 (at z = 0.018), suggesting that the SN is associated with this galaxy or the Coma cluster, in which NGC 4923 resides. The SN is offset from NGC 4923 by 59", corresponding to 23.7 kpc (using H0 = 73 km/s/Mpc and Virgo+GA infall model) if at the distance of NGC 4923. An SDSS spectrum of NGC 4923, which has an S0 classification, has no indication of star formation. The remote location of this transient and its low-luminosity (M_r ~ -15.5 mag) is consistent with the ''Ca-rich'' class (Filippenko et al., 2003, IAUC 8159 ; Perets et al., 2010, Nature, 465, 322). We also note that photometry from the Young Supernova Experiment (Jones et al., 2021, ApJ, 908, 143) show a fast rise of <2 days, followed by a decline, and now with a second rise in red bands, consistent with the early behaviour of SN 2019ehk (Jacobson-Galan et al., 2020, ApJ, 898, 166). (2) Redshift derived from the Na I D doublet. We measure an Si II 6355 velocity of -11,300 km/s. (3) We measure an Si II 6355 velocity of -11,500 km/s. (4) We measure an Si II 6355 velocity of -13,000 km/s.
|
2021-04-14 04:48:00
|
optical,star,supernovae,transient
|
2021-04-14
|
04:48:00
| 1,674 |
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] | 14,544 |
14,547 |
Enhanced optical activity of the 1156+295 (4C+29.45) quasar
|
S. S. Savchenko, E. G. Larionova, E. V. Shishkina, D. A. Morozova (St. Petersburg univ., Russia)
|
The OVV quasar 1156+295 (4C+29.45) shows high activity at optical wavelengths including high degree of linear polarization. According to our observations with 0.4-m LX200 with FLI ML4710 (St. Petersburg university) and 0.7-m AZT-8 with SBIG ST-7 (Crimean observatory), the object's R band magnitudes and the polarization degrees of the last nights are: JD mag p[%] err 59311.3909 15.39 2.6 2.1 59313.4437 14.68 30.7 0.8 59314.4999 13.91 28.4 0.5 59315.3468 14.25 24.0 1.0 59315.4224 14.32 20.7 1.0 The objects light curve is available at our website. We plan to continue the monitoring of this object.
|
2021-04-14 15:32:00
|
optical,agn,blazar,quasar
|
2021-04-14
|
15:32:00
| 601 |
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] | 14,545 |
14,548 |
Strong increase of the optical brightness of BL Lac observed at the Hans-Haffner-Sternwarte
|
Kilian Schoch, Niels Bader, Felix Hemrich, Ben Horst, Johannes Knoett, Kai Koeberlein, David Reinhart, Korbinian Rosenlehner, Lukas Schneider, Remco Steineke, Dirk Seifert, Anton Stoz, Lukas Waller, Nils Zottmann, Martin Feige, Christian Lorey (all Friedrich-Koenig-Gymnasium / Hans-Haffner-Sternwarte), Lukas Kunkel, Adrian Scherbantin, Karl Mannheim (all Universitaet Wuerzburg), Dominik Elsaesser (TU Dortmund)
|
BL Lacertae (ICRS coords. (ep=J2000): RA 22 02 43.291 Dec +42 16 39.978) is the prototypical BL Lac object and has been showing exceptional activity for months. After this object had reached historic optical brightness values in midsummer and autumn 2020 (ATel#13930, ATel#13956, ATel# 13958, ATel# 14065, ATel# 14069, ATel #14081, ATel #14096) and again in the beginning of this year (ATel #14328 & #14329, ATel #14334, ATel #14343, ATel #14356, ATel #14467), we were able to measure another strong increase in the brightness of BL Lac in the optical range in the last night. Our optical measurements were taken using Bessel filters. Photometry was done using the specifications of the GASP list of WEBT (https://www.oato.inaf.it/blazars/webt/gasp/fc/2200fc.html). Since the last measurements 4 nights ago (due to the wintry weather in Germany no further measurements were possible in between) the brightness in the R-band increased by about a magnitude. With a brightness of 11.78 this outburst comes close to the maximum from autumn 2020 (ATel #14081: MJD 59127.450; R=11.73) and the all-time high from the beginning of this year (ATel #14328 & #14329: 2021 Jan. 17.87; R=11.45). R - band magnitudes: JD 2459305.5237: 12.88 +/- 0.01 JD 2459308.5557: 12.81 +/- 0.01 JD 2459309.5283: 12.91 +/- 0.01 JD 2459313.5594: 12.83 +/- 0.01 JD 2459318.5210: 11.80 +/- 0.01 JD 2459318.5494: 11.78 +/- 0.01 JD 2459318.5548: 11.78 +/- 0.01 V - band magnitudes: JD 2459305.5256: 13.45 +/- 0.02 JD 2459308.5575: 13.43 +/- 0.01 JD 2459309.5302: 13.52 +/- 0.02 JD 2459313.5612: 13.43 +/- 0.02 JD 2459318.5228: 12.35 +/- 0.01 JD 2459318.5512: 12.32 +/- 0.01 JD 2459318.5566: 12.33 +/- 0.01 B - band magnitudes: JD 2459305.5274: 14.69 +/- 0.05 JD 2459308.5593: 14.56 +/- 0.02 JD 2459309.5321: 14.61 +/- 0.06 JD 2459313.5630: 14.59 +/- 0.07 JD 2459318.5246: 13.44 +/- 0.02 JD 2459318.5530: 13.38 +/- 0.02 JD 2459318.5584: 13.39 +/- 0.02 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).
|
2021-04-14 23:45:00
|
optical,agn,black hole,blazar,quasar
|
2021-04-14
|
23:45:00
| 2,258 |
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] | 14,546 |
14,549 |
Detection of a persistent radio source at the location of FRB20201124A with VLA
|
Roberto Ricci (INAF/IRA), Luigi Piro (INAF/IAPS), Francesca Panessa (INAF/IAPS), Brendan O'Connor (George Washington University), Simone Lotti (INAF/IAPS), Gabriele Bruni(INAF/IAPS) , Bing Zhang (University of Nevada)
|
We observed the location of FRB 20201124A with the VLA (Program SG9112, PI: Piro) on April 9 for 2 hours, starting at UTC 2021-04-09T23:51:37. Observations were carried out with the array in configuration D, in the S and X bands (3 and 9 GHz respectively), corresponding to a X-band beam size of 7x6 arcsec. We detect an unresolved persistent radio source with a flux density of 0.34 +/- 0.03 mJy at 3GHz and 0.15+/-0.01 mJy at 9 GHz at a position (epoch J2000) of (RA, Dec) = (05:08:03.49, +26:03:37.6) with a 5 sigma positional uncertainty of about 1 arcsec. This radio source is coincident with the persistent radio source detected by uGMRT (Atel#14529), with the VLA/realfast burst position (ATel #14526), with the FAST position (ATel #14518) and with the location of the galaxy SDSS J050803.48+260338.0 (ATel #14516), but offset by about 3.3 arcsec from the latest ASKAP burst position (ATel #14515). We note that the radio power at 3 and 9 GHz is Log P = 21.88 and 21.54 W/Hz (respectively). The spectral index between the uGMRT measurement at 0.65 GHz and our 3 GHz data point is about -0.5 while it steepens between 3 and 9 GHz (~0.7). Taking the X-ray upper limit from our SWIFT observation (ATel#14525) and assuming that the radio emission is produced by an AGN, we derive a lower limit to the X-ray radio-loudness calculated as Log(Lr/Lx) <-4 (Terashima & Wilson 2003, ApJ 543, 185), a typical value for Radio Quiet AGN. Further observations are planned to assess the nature of the persistent radio emission.
|
2021-04-15 05:18:00
|
radio,x-ray,agn,fast radio burst
|
2021-04-15
|
05:18:00
| 1,519 |
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] | 14,547 |
14,550 |
Swift Bulge Survey: Follow-up observations of the transient source Swift J174038.1-273712
|
Rivera Sandoval, L. E., Heinke, C. O. (U. Alberta), Maccarone, T. (TTU), Shaw, A.(U. Nevada, Reno), Sivakoff, G. (U. Alberta) on behalf of the SBS team
|
We report Neil Gehrels Swift Observatory follow-up observations of the recently discovered transient source Swift J174038.1-273712 (Atel #14536, #14545), towards the Galactic bulge. The transient has decayed by less than a factor of 2 over 5 days, suggesting that it has already peaked in Lx, but that it is not rapidly decaying.
Observations were obtained on 2021-04-14 with a total exposure time of 635s. Fitting the X-ray spectrum of the source with an absorbed power-law where N_H is fixed to the Galactic value of 5.5E21 cm^-2 and using the Cash statistics, we have obtained a power-law photon index of 1.5(+/-0.3) and a X-ray flux of 1.9(+0.4/-0.3)*1E-11 erg/s/cm^2 in the 0.5-10 keV band. There are too few counts in the Swift spectrum to fit the absorbed (blackbody+thermally comptonized continuum) model indicated by the NICER data. This flux is slightly fainter than the 0.5-10 keV flux measured by Swift [3.2(+2.3/-1.1)*1E-11 erg/s/cm^2, Atel #14536] at about 2021-04-08 20:06 (the 2021-04-09 date reported by Atel #14536 was the last time of the Bulge survey fields). Approximately 19 hours later, the flux measured by NICER [1.5(+/-0.2)*1E-11 erg/s/cm^2 0.5-10 keV, Atel #14545] is consistent with the Swift flux from 2021-04-14. It is possible that NICER's absolute flux could be slightly incorrect, as it is not an imaging instrument and this is a faint source in a crowded field. It is unclear whether this transient may have had a relatively bright outburst that peaked before our initial observations, but INTEGRAL data of this region may constrain this scenario.
Neither 2021-04-14 UVOT observations of the field in the UVM2 filter, nor archival UVOT images in the same filter, reveal any source at the position of Swift J174038.1-273712. Further Swift observations are planned.
We thank the Swift team for scheduling our ToO request.
|
2021-04-15 11:51:00
|
x-ray,transient
|
2021-04-15
|
11:51:00
| 1,856 |
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] | 14,548 |
14,551 |
MASTER OT J004310.68+412604.3 - OT outburst in M31
|
A. Pozdnyakov, V. Lipunov, V. Kornilov (Lomonosov MSU), O. Gress(ISU), I. Gorbunov, E. Gorbovskoy, N. Tyurina, P. Balanutsa, K. Zhirkov, T. Pogrosheva, A. Kuznetsov, F. Balakin, V. Vladimirov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, V. Shumkov, A. Chasovnikov, E. Minkina, V. Topolev, V. Grinshpun, D. Kuvshinov (Lomonosov Moscow State University), R. Podesta, C. Lopez, F. Podesta, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), 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 J004310.68+412604.3 discovery - outburst with ampl>3m
MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 00h 43m 10.68s +41d 26m 04.3s on 2021-04-15.02956 UT. The OT unfiltered magnitude is 18.2m (mlim=19.2). The OT is seen at 3 images on 2021-04-15. There is no minor planet at this place. MASTER has reference images, one of them was at 2016-12-21.74273 UT with unfiltered mlim= 21.3m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/004310.68412604.3.png
|
2021-04-15 16:04:00
|
optical,nova,planet,transient,variables
|
2021-04-15
|
16:04:00
| 651 |
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] | 14,549 |
14,552 |
INTEGRAL hard X-ray constrains on the new X-ray transient Swift J174038.1-273712
|
V. Sguera (INAF-OAS Bologna, Italy), L. Sidoli (INAF-IASF MIlano, Italy), E. Kuulkers (ESA/ESTEC, Noordwijk, Netherlands) on behalf of the Galactic bulge monitoring team
|
Swift J174038.1-273712 is a new X-ray transient recently discovered during the Swift Bulge Survey (ATel #14536) on 9 April 2021, when the source was detected at a flux level equal to about 3 x 10-11 erg cm-2 s-1 (0.5-10 keV). Follow-up observations were performed with NICER approximately 19 hours later (ATel #14545) and with Neil Gehrels Swift 5 days later (ATel #14550). In particular, the latter Neil Gehrels Swift observation measured a flux smaller by less than a factor of 2 over 5 days, suggesting that the transient activity had already reached its peak but that it was not rapidly decaying (ATel #14550).
|
2021-04-15 21:04:00
|
x-ray,transient
|
2021-04-15
|
21:04:00
| 614 |
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0.014890200458467007
] | 14,550 |
14,553 |
Visible and infrared spectroscopy of the nova V6595 Sagittarii
|
A. J. Bayless (Aerospace Corp.), R. J. Rudy (Kookoosint Scientific), and J. P. Subasavage (Aerospace Corp.)
|
We report results derived from 0.47-2.5 microns spectroscopy of the rapidly developing nova V6595 Sagittarii. The data were obtained 2021 April 8.503 (UT) with the Aerospace Corporation's 1.0 m telescope using its Visible and Near-Infrared Imaging Spectrograph (VNIRIS). V6595 Sgr was discovered on images from 2021 April 4.825 UT by Pearce and identified as a classical nova by Taguchi et al. (CBET #4952, ATel #14513). Optical spectroscopic measurements from 2021 April 6 by Aydi et al. (ATel #14533) were used by them to classify V6595 Sgr as an Fe II type nova. They also noted P-Cygni profiles and emission lines of low contrast relative to the continuum but with exceptional breadth. Our observation from two days later indicate considerable changes: emission lines were strong and P-Cygni absorptions had mostly disappeared. The emission lines remained exceptionally broad for an Fe II novae with FWHM of 3500 km/sec or greater. Fe II features were still present along with C I, N I, and O I, but He I emission was also present, indicative of the rapid spectral evolution of this nova. The N I lines were unusually strong relative to the C I features. Although there was no indication of dust emission, V6595 Sgr was bright at near infrared wavelengths: IR magnitudes derived from the spectroscopy are J = 5.5, H = 5.0, Kshort = 4.6
|
2021-04-16 05:42:00
|
infra-red,optical,nova
|
2021-04-16
|
05:42:00
| 1,339 |
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] | 14,551 |
14,554 |
MAXI/GSC detection of X-ray brightening from the X-ray pulsar XTE J1829-098
|
M. Nakajima, H. Negoro (Nihon U.), T. Kawamuro (UDP/NAOJ), T. Mihara (RIKEN), M. Aoki, K. Kobayashi, R. Takagi, 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, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, 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, K. Kurogi, K. Miike (Miyazaki U.), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), M. Sugizaki (NAOC)
|
Following the report of the outburst onset observed by SRG/ART-XC (Shtykovsky et al. 2021, ATel #14521), the MAXI/GSC nova alert system triggered on an X-ray activity from the 7.8 second transient X-ray pulsar XTE J1829-098 on 2021-04-12 (MJD 59316). The average daily flux in the 5-12 keV band rose to 0.055 +- 0.014 photons/s/cm2 (55 +- 13 mCrab), and exhibited a moderate decrease trend. Prior to this brightening, we found that there are two X-ray outbursts in the MAXI/GSC archive data. The previous outbursts took place in December 2019 and August 2020, both events were not posted to the MAXI mailing list. Thus, including the first our report about this source (ATel#11927), MAXI detected four X-ray outbursts from this pulsar in the 11 years observation so far. The time intervals between each outburst can be explained with the proposed outburst periodicity of ∼246 d (Markwardt et al. 2009). In order to obtain the precise orbital (outburst) periodicity, we used a period search techniques. A new ephemeris derived from the MAXI/GSC data spanning the past 11 years predicts the X-ray outbursts as: Toutburst = MJD 58341.73 + n * (243.66 +- 3.07) where n is the number of orbit since the outburst in August 2018. The derived outburst periodicity is consistent with the former result (Markwardt et al. 2009). Using a new ephemeris, it is turned out that the date of the triggered event by the MAXI/GSC nova-search system is 0.998 in the orbital phase. It nicely matches with the outburst expected phase.
|
2021-04-16 09:11:00
|
x-ray,binary,neutron star,nova,pulsar,star,transient
|
2021-04-16
|
09:11:00
| 1,512 |
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] | 14,552 |
14,555 |
MAXI /GSC detection of a new X-ray transient MAXI J0903-531
|
K. Yamaoka (Nagoya U.), H. Negoro (Nihon U.), M. Serino (AGU), 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, W. Iwakiri, R. Sasaki, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, 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, K. Kurogi, K. Miike (Miyazaki U.), T. Kawamuro (UDP/NAOJ), Y. Kawakubo (LSU), M. Sugizaki (NAOC) report on behalf of the MAXI team:
|
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 04:33 UT on 2021 April 14. Assuming that the source flux was constant over 41 transits from 17:18 on April 13th, we obtain the source position at (R.A., Dec) = (135.898 deg, -53.132 deg) = (09 03 35, -53 07 55) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.53 deg and 0.4 deg, respectively. The roll angle of long axis from the north direction is 96.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The X-ray flux averaged over the scans was 16+/-5 mCrab (4.0-10.0keV, 1 sigma error). There are signs that the source flux is gradually increasing from a week ago. Since there is no bright catalogued X-ray source in the error region, we tentatively name the source MAXI J0903-531. Follow-up observations are strongly encouraged to clarify the nature of this source.
|
2021-04-16 16:02:00
|
x-ray,black hole,neutron star,nova,star,transient
|
2021-04-16
|
16:02:00
| 956 |
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] | 14,553 |
14,556 |
Extremely bright pulse from FRB20201124A observed with the 25-m Stockert Radio Telescope
|
Wolfgang Herrmann (Astropeiler Stockert e. V.)
|
We report on the observation of an extremely bright pulse from FRB20201124A observed in L-band with the Stockert 25-m Radio Tele scope. Following the report of enhanced activity by the CHIME/FRB collaboration (ATel #14497) observations with this instrument began on 2021 March 31. Until April 15, a total of approx. 90 hours of observation time had been accumulated distributed over 12 days. Observations were carried out with 100 MHz bandwidth at a center frequency of 1380 MHz with 218.4 microseconds time resolution and 583 MHz spectral resolution. Data was analyzed for single pulses using PRESTO with an S/N threshold of 6. Candidates were subsequently inspected visually.
An extremely bright pulse was detected on 2021 April 15 at 12:23:19.369 UTC using the position of the source as given by Law et.al. in ATel #14526. This pulse had a fluence of 334 Jy ms (+/- 10%) and a peak flux density of 215 Jy (+/- 10%) giving an excellent S/N of 85. The full width half maximum of the pulse was 1.5 ms (+/- 0.2 ms) and the DM was determined to be 412.8 (+/- 0.2) pc/cm^3 We believe this is the pulse with the highest fluence detected from this source so far. A dynamic spectrum is available at the link below. A few other events were noted but the S/N was too low to be conclusive. The source seems to continue to be in an active state and observations will continue.
This detection supports the finding by Kumar et.al (ATels #14508, #14509) that bursts from this source can be detected with smaller apertures and further observations with such instruments are encouraged.
The Stockert 25-m Radio Telescope is located in the western part of Germany close to Effelsberg. It has been built in 1956 and, after a longer hiatus, is back in operation since 2011. It has been refurbished and fitted with new receivers and instrumentation. Presently the instrument is equipped with a dual linear polarization L-band receiver and achieves a SEFD of 1100 Jy. The observatory is operated by Astropeiler Stockert e.V., a non-profit organization of volunteers.
|
2021-04-16 23:47:00
|
radio,fast radio burst
|
2021-04-16
|
23:47:00
| 2,049 |
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] | 14,554 |
14,557 |
MAXI J0903-531: Swift localization and optical counterpart
|
J. A. Kennea (PSU), A. Bahramian (ICRAR), P. A. Evans, A. P. Beardmore (U Leicester), H. A. Krimm (CRESST/GSFC/USRA), P. Romano (INAF-IASFPA), K. Yamaoka (Nagoya U.), M. Serino (RIKEN), H. Negoro (Nihon U.)
|
Starting at 12:02UT on April 16th, 2021, Swift began a target of opportunity observation of the error region of MAXI J0903-531 (ATEL #14555), consisting of 10 paintings to cover the MAXI error regions with 200s per pointing. In the Photon Counting mode Swift/XRT data, we find a previous uncatalogued X-ray source at the following location: RA/Dec(J2000) = 136.27866, -53.50518 which is equivalent to:
with an estimated uncertainty of 2.8 arc-seconds radius (90% confidence). This lies 26 arc-minutes from the center of the MAXI error region, inside the error ellipse. This source is the only one detected that lies inside the MAXI error region, and has an average count rate over the 200s observation of approximately 1.34 +/- 0.12 XRT count/s. No significant variability is seen over the short observation. We note also that this position is consistent with a UVOT source detected in the u filter, with magnitude u=12.54 +/- 0.02 (Vega system).
A catalogue search in Vizier finds that this optical counterpart is known, and has an estimated distance from Gaia of around 10 kpc (e.g. Bailer-Jones et al., 2021), the GAIA counterpart of MAXI J0903-531 is Source 5311384333263075840 (GAIA EDR3).
The PC mode spectrum can be well fit by an absorbed power-law model, with photon index = 0.6 +/- 0.3 and N_H = 2.5 +/- 3.5 x 10^21 cm^-2. This hard spectrum is suggestive of the source being an accreting pulsar, such as a Be/XRBs and other HMXBs.
Further observations of this source have been requested.
This analysis is support by the Swift Guest Investigator Program.
|
2021-04-17 02:20:00
|
optical,x-ray,pulsar,transient
|
2021-04-17
|
02:20:00
| 1,569 |
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] | 14,555 |
14,558 |
Insight-HXMT scanning survey detections of the new X-ray transient MAXI J0903-531
|
C. Wang, J.-Y. Liao, J. Guan, C.-K. Li, Y. Nang, N. Sai, Y. Liu, Y. Chen, X.-L. Cao, C.-Z. Liu, T.-P. Li, F.-J. Lu, L.-M. Song, M. Wu, Y.-P. Xu, S.-N. Zhang, report on behalf of the Insight-HXMT team:
|
Upon the report of the new X-ray transient MAXI J0903-531 discovered by MAXI /GSC (K. Yamaoka et al. 2021, ATEL #14555), the precise position of the source was obtained with the Swift follow-up observation (J. A. Kennea et al. 2021, ATEL #14557). We carefully inspected the candidate new source list from the regular Galactic plane scanning survey with Insight-HXMT/LE (Sai et al. 2020), and found three positive detections at the locations near MAXI J0903-531, which are listed as follows:
Scanning time: January 7th, 2018; 01:13 UT for 306 s Candidate new source position: (R.A., Dec) = (135.49 deg, -53.56 deg) (J2000) with 1-sigma error of 0.38 deg. Average flux: 9.5+/-1.7 mCrab (1-6 keV, 1-sigma error)
Scanning time: March 17th, 2020; 09:54 UT for 428 s Candidate new source position: (R.A., Dec) = (135.75 deg, -53.51 deg) (J2000) with 1-sigma error of 0.65 deg. Average flux: 3.1+/-1.5 mCrab (1-6 keV, 1-sigma error)
Scanning time: February 9th, 2021; 11:28 UT for 636 s Candidate new source position: (R.A., Dec) = (135.90 deg, -53.49 deg) (J2000) with 1-sigma error of 0.51 deg. Average flux was 4.6+/-1.6 mCrab (1-6 keV, 1-sigma error)
The first detection is consistent with the precise position of (R.A., Dec) = (136.27866 deg, -53.50518 deg) (J2000) reported by Swift (ATEL #14557) within 2-sigma error, and the other two are consistent within 1-sigma error.
Insight-HXMT is the first Chinese astronomy satellite, which was launched in 2017 and funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More detailed information is given on website: http://hxmtweb.ihep.ac.cn/.
References: Sai, N., Liao, j.-Y., Li, C.-K., et al. 2020, JHEAp, 26, 1.
|
2021-04-17 23:43:00
|
x-ray,transient
|
2021-04-17
|
23:43:00
| 1,719 |
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] | 14,556 |
14,559 |
NICER detection of periodicity in the new X-ray transient MAXI J0901-531
|
P. S. Ray (NRL), A. Sanna (Univ. Cagliari), K. C. Gendreau (NASA/GSFC), Gaurava K. Jaisawal (DTU Space), Jamie Kennea (PSU), Wataru Iwakiri (Chuo U.), T. Mihara (RIKEN), T. E. Strohmayer (NASA/GSFC), D. Chakrabarty (MIT), M. T. Wolff (NRL), D. Altamirano (Univ. of Southampton), Z. Arzoumanian (NASA/GSFC), P. Jenke (UAH), C. A. Wilson-Hodge (NASA/MSFC)
|
Following the discovery of the new X-ray transient MAXI J0901-531 (ATel #14555), we triggered observations with the Neutron Star Interior Composition Explorer (NICER) that started on 2021 April 16 at 19:48 UT and obtained a total exposure of ~9.25 ks. The pointing direction was the Swift localization from ATel #14557.
NICER's average measured count rate was 19.6 cts/s (0.5-8 keV), including a background contribution of < 1 c/s. The power spectrum exhibits a low-frequency noise component extending to about 0.1 Hz, plus a coherent periodicity with a fundamental frequency of 0.07 Hz with at least four significant harmonics. A pulse timing analysis gives a frequency of 0.0711477(2) Hz (P = 14.055 seconds). No significant frequency derivative is seen with a limit of |F1| < 4E-12 Hz/s. The frequency value is consistent with the Fermi/GBM measurement obtained by integrating data collected in the time interval April 13-16.
We fitted the 0.5-10 keV spectrum with an absorbed power-law model. This model failed to describe the NICER energy continuum. To better fit the spectrum, an additional blackbody (bbodyrad in XSPEC) was added along with the power-law component. Following are preliminary spectral parameters derived from this analysis: absorption column density N_H = (4.1+/-0.2) x 10^21 cm^-2 (Wilms abundance), black body temperature kT = 0.61+/-0.02 keV, blackbody normalization BBnorm = 14+/-1, and photon index = 0.13+/-0.06. The best fit reduced chi-squared is 1.13 for 827 degrees of freedom. The 0.5-10 keV unabsorbed flux is 1.83x10^{-10} erg/s/cm^2. No iron line feature is observed between 6-7 keV though we see some excess around 7.5 keV. Further investigation is required.
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.
|
2021-04-19 07:13:00
|
x-ray,gamma ray,binary,neutron star,pulsar,star,transient
|
2021-04-19
|
07:13:00
| 1,871 |
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] | 14,557 |
14,560 |
Long-Term X-ray Flaring Activity of the TeV-Detected Blazar H1426+428
|
Bidzina Kapanadze (Ilia State University, Tbilisi, Gerogia; E. Kharadze National Astrophysical Observatory, Abastumani, Georgia)
|
Since January 2021, the TeV-detected BLazar H1426+428 (z=0.129) is showing a long-term X-ray flaring activity, detected with the X-Ray Telescope onboard Neil Gehrels Swift Observatory (Swift-XRT). Namely, the 0.3-10 keV count rate attained a level of ~6 cts/s on March 19 which is the second highest value during the Swift-XRT monitoring of the source (199 observations since 2004 December 22). The flare peak was followed by the brightness fluctuations by a factor of ~2 which is evident even on the hourly timescales. Namely, H1426+428 showed the flux halving instances during the observations performed on March 19 and April 18. The flux variability is accompanied by the significant spectral changes which are consistent with the "harder-when-brighter" behaviour (hinting at the dominance of the synchrotron cooling of ultra-relativistic electrons). With ATel#14501 (posted on 2021 April 1), the VERITAS team reported the detection of the target's enhanced TeV-band activity: the mean flux in 2021 is approximately double of its long-term average over the last decade. Some optical-UV enhancements are evident from the Swift-UVOT observations. Consequently, the intense multiwavelength observations of H1426+428 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.
|
2021-04-19 18:29:00
|
optical,x-ray,tev,blazar
|
2021-04-19
|
18:29:00
| 2,071 |
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] | 14,558 |
14,561 |
MAXI/GSC detection of a possible X-ray flare from the RS CVn binary system EI Eri
|
S. Kitakoga, W. Iwakiri (Chuo U.) H. Negoro, M. Nakajima, Kobayashi, K. Asakura, K. Seino (Nihon U.), T. Mihara, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, K. Komachi, A. Yoshida (AGU), Y. Tsuboi, H. Kawai, Y. Okamoto (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, 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) report on behalf of the MAXI team:
|
The MAXI/GSC nova alert system triggered an X-ray flare-like event at 2021-04-18 13:32 (UT). The estimated X-ray flux was about 79 +/- 19 mCrab (1 sigma error) in the 4 - 10 keV band. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (62.116 deg, -7.697 deg) = (04 08 27, -07 41 49) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.32 deg and 0.29 deg, respectively. The roll angle of the long axis from the north direction is 162.0 deg counterclockwise. Considering an additional systematic uncertainty of 0.1 deg (90% containment radius), this position is consistent with that of the RS-CVn type binary EI Eri. During the next transit at 15:06 UT, any source was not detected significantly (< 45 mCrab at 4 - 10 keV) with MAXI/GSC. The upper limit of the e-folding decay time is less than about 2.7 h because the X-ray flux decreased to less than 45 mCrab at the next scan transit of MAXI (92 minutes after). Although we cannot exclude the possibility that this event is a GRB, it is likely to be associated with a stellar flare from EI Eri. If it is correct, it is the first detection of a stellar flare from EI Eri in the 11 years of MAXI observations.
|
2021-04-19 21:46:00
|
x-ray,binary,nova,star,transient
|
2021-04-19
|
21:46:00
| 1,256 |
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] | 14,559 |
14,562 |
Spectroscopic Classifications of Optical Transients with Lick Shane + Kast
|
S. Tinyanont, K. Taggart, C. Rojas-Bravo, R. J. Foley (UCSC)
|
We report the classification of the optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope, made on 2021 Apr 19 UT. The targets were supplied by ATLAS, YSE, and ZTF. The classifications were performed with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
Notes: When the redshift is given to 2 significant figures, it is derived from the SN spectrum. Otherwise, the redshift is determined from the host galaxy. (1) We measure a He 5876A velocity of -10,000 km/s. (2) We measure a Si velocity of -12,000 km/s. (3) We measure a Si velocity of -12,000 km/s. (4) We measure a Si velocity of -14,400 km/s.
|
2021-04-20 07:53:00
|
optical,supernovae,transient
|
2021-04-20
|
07:53:00
| 644 |
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] | 14,560 |
14,563 |
Aquila X-1 returns to quiescence : optical monitoring of the 2021 outburst
|
Payaswini Saikia, David M. Russell, Maria Cristina Baglio, D. M. Bramich (NYU Abu Dhabi) and Fraser Lewis (Faulkes Telescope Project & Astrophysics Research Institute, LJMU)
|
The transient neutron star low-mass X-ray binary Aquila X-1 (Aql X-1) is known to have frequent outbursts every year, with each outburst typically lasting from a few weeks to a few months (e.g. Degenaar et al. 2019). The most recent outburst of the source was reported by the Zwicky Transient Facility (ZTF; Bellm et. al 2019, Graham et. al 2019), when they detected the source on MJD 59267 (2021 February 22) with an optical ZTF-r filter magnitude of ~17.6 (ATel #14437). Here we report on the optical monitoring of Aql X-1 during the 2021 outburst, and the recent optical fading of the source back to quiescence. We have been frequently monitoring Aql X-1 since 2006 April with the Las Cumbres Observatory (LCO) 2-m (Faulkes) and 1-m robotic telescopes (see e.g. ATel #1218, #2871, #9306, #13953). We detected the source on MJD 59280.4 (March 7) confirming the outburst seen with ZTF, with optical magnitudes i'=17.42+/-0.02 and V=18.26+/-0.03. Prior to this, the source was detected in quiescence with magnitudes i'=18.17+/-0.02 and 18.67 on MJD 59261 (February 16). The source rose in all the optical bands towards the peak of the outburst (around MJD 59297-59300), with the brightest magnitudes being 'â=16.77+/-0.01 and r' =17.12+/-0.01 on MJD 59297 (March 24); and V=17.67+/-0.02 and R=17.13+/-0.01 on MJD 59300 (March 27). The i'-band data which was closely monitoring the source during the outburst, shows a variability of ~0.3 magnitudes during the peak of the outburst (MJD 59297-59302). This is one of the fainter outbursts of Aql X-1, as normally the outburst peaks are observed at much brighter magnitudes. For comparison, the previous outburst seen in 2020 had peak magnitudes of i'=16.07+/-0.01, R=16.20+/-0.01 and V=16.64+/-0.01 on MJD 59107.9 (2020 Sept 15). After reaching the peak magnitudes around MJD 59300, Aql X-1 started its decay in all the optical bands. The most recent observations of the source obtained on MJD 59323.1 (2021 April 19), with magnitudes i'=18.07+/-0.03, R=18.37+/-0.02 and V=19.16+/-0.03, are consistent with the source being back in quiescence. We expect the outburst to have ended between MJD 59314-59323, with the last detection during the outburst being on MJD 59314 (April 10) with i' = 17.72+/-0.01 and r'=18.21+/-0.01. We will continue to monitor Aql X-1 in optical wavelengths as part of an on-going monitoring campaign of ~50 low-mass X-ray binaries (Lewis et al. 2008) with LCO and the Faulkes Telescopes. The analysis of the LCO data are performed with a new real-time data analysis pipeline, the ''X-ray Binary New Early Warning System'' (XB-NEWS; see Russell et al. 2019 and Goodwin et al. 2020 for details). We acknowledge the support of the NYU Abu Dhabi Research Enhancement Fund under grant RE124.
|
2021-04-20 16:13:00
|
optical,x-ray,binary,black hole,neutron star,star,transient
|
2021-04-20
|
16:13:00
| 2,761 |
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] | 14,561 |
14,564 |
MAXI J0903-531: confirmation of Be star companion and possible binary period
|
Monageng I. M. (UCT/SAAO), Coe M. J. (Southampton), Buckley D. A. H. (SAAO), Kennea J. A. (PSU), Strader J. (MSU), Townsend L. J. (SALT/SAAO)
|
On 18 April 2021 at 20:22:24 UTC we obtained a spectrum of the optical counterpart of the newly-discovered X-ray transient, MAXI J0903-531 (ATel #14555, #14557, #14559), with the Southern African Large Telescope (SALT) under the SALT transient follow-up programme (2018-2-LSP-001). The High Resolution Spectrograph (HRS) was used in Low Resolution (LR) mode (R~16 000)with an exposure time of 1800 secs covering a wavelength region 3750 - 8500 Angstroms. The spectrum shows a number of Balmer and helium absorption lines, with the H-alpha and H-beta lines in emission, and is consistent with an early spectral type star. The H-alpha emission line shows an asymmetric double-peaked profile that is dominated by the red peak and broad wings. The H-beta line shows a double-peaked morphology with a shell profile, where the central depression goes below the continuum level. The measured equivalent width (EW) and FWHM of the H-alpha line are -4.46±0.40 Angstroms and 9.39±0.02 Angstroms, respectively.
Using the criteria of Evans et al. (2004), we performed a spectral classification using the blue end of the spectrum (4000 - 5000 Angstroms). The absence of the HeII 4686, 4541 and 4200 lines indicate that the optical counterpart is of spectral type later than B0 while the presence of the OII 4415, CIII+OII 4650 and OII+NII 4631 blends make it earlier than B3. The absence of SiIV 4116 eliminates B1 and the ratio of the SiIII 4553 and MgII 4481 rules out a B3 spectral type (SiIII > MgII). The estimated distance from GAIA of 10 kpc (ATel #14557) and the average V-band magnitude from ASAS-SN of 13.3 mags constrain the luminosity class range to III-V. In summary, the spectral type of the optical counterpart is B1.5-2 III-Ve. We note that the distance estimate might vary, as the parallax measurements from GAIA are dominated by systematics which are expected to change in subsequent data releases. This can have an effect of altering the derived luminosity class. The spectral classification of the optical counterpart, together with the X-ray spectral properties (ATel #14557 and #14559) confirm that MAXI J0903-531 is a new Galactic Be X-ray binary system.
Data from the ASAS-SN project were used to investigate the optical behaviour of the proposed counterpart, and g-band data in particular were selected as they presented the most coverage. Globally the g-band flux has steadily increased from an average magnitude of 13.44 around JD 2458500 (16 January 2019) to 13.18 in the last few months. If these data are first detrended with a polynomial, then a Lomb-Scargle analysis reveals a strong modulation at a period of 3.84 days with an amplitude of 0.05 magnitudes. If the increase in g-band brightness is indicative of a growing circumstellar disk, then this modulation may indicate the binary period of the system. The measured H-alpha EW is consistent with the short orbital period based on the well-known correlation between the EW and orbital period in BeXBs (Reig et al. 2011), although there is a large scatter in the low-end of the relationship. Furthermore, the circumstellar disc could still be growing and so the measured EW might not be at maximum.
|
2021-04-21 00:16:00
|
optical,x-ray,binary,pulsar,star,transient
|
2021-04-21
|
00:16:00
| 3,173 |
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] | 14,562 |
14,565 |
Apparent Outburst of Comet 22P/Kopff
|
Michael S. P. Kelley (U. Maryland), Tim Lister (Las Cumbres Observatory), Kritti Sharma (IITB), Harsh Kumar (IITB), Varun Bhalerao (IITB), G. C. Anupama (IIA), Sudhanshu Barway (IIA) on behalf of the Zwicky Transient Facility Collaboration, LCO Outbursting Objects Key Project, and GROWTH India Collaboration
|
We report on an apparent outburst of comet 22P/Kopff, initially found in Zwicky Transient Facility (ZTF; Bellm et al. 2019, PASP, 131, a8002) data. The comet brightened from i=18.79+/-0.15 mag to r=17.93+/-0.05 mag between 2021 Apr 18.213 and 19.212 UTC, respectively. All photometry is measured in 5" radius apertures and in the PS1 magnitude system. We estimate coma colors based on observations taken during the prior 48 days (g-r=0.52+/-0.04 mag, r-i=0.26+/-0.06 mag), suggesting an outburst strength of -1.12+/-0.17 mag. The event is confirmed with GROWTH India Telescope and Las Cumbres Observatory data from a 1m telescope at the Siding Spring Observatory node, observed in the SDSS r' filter. Photometry since 2021 Apr 01 is tabulated below with heliocentric distance (rh), observer-comet distance (delta), effective r-band magnitude (r), and epoch-to-epoch variation in r (dr).
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, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
This work makes use of observations from the Las Cumbres Observatory global telescope network.
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).
|
2021-04-21 05:14:00
|
optical,comet,transient
|
2021-04-21
|
05:14:00
| 2,181 |
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] | 14,563 |
14,566 |
MASTER OT J121212.00-453633.0 - new OT with ampl>5.2m
|
T. Pogrosheva, K. Zhirkov, V. Lipunov, V. Kornilov (Lomonosov MSU), D. Buckley (SAAO), O. Gress(ISU), I. Gorbunov, E. Gorbovskoy, N. Tyurina, P. Balanutsa, A. Kuznetsov, V. Vladimirov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, V. Shumkov, A. Chasovnikov, E. Minkina, V. Topolev, V. Grinshpun, D. Kuvshinov, F. Balakin(Lomonosov Moscow State University), R. Podesta, C. Lopez, F. Podesta, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), 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 J121212.00-453633.0 discovery - outburst ampl>5.2m (POSS limit), no known sources in history
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 12h 12m 12.00s -45d 36m 33.0s on 2021-04-20.82664 UT. The OT unfiltered magnitude is 17.3m (mlim=19.5). The OT is seen in 2 images (MASTER-SAAO), and in 2 images at MASTER-OAFA at 2021-04-21 05:51:47UT with m_OT=16.8. There is no minor planet at this place. We have reference image on 2019-03-06.92360 UT with unfiltered mlim=20.3m, the nearest in time image without OT is 2021-04-20 04:55:42UT with unfiltered mlim=18.5. There is no known sources in VIZIER, that gives 22m POSS limit and current ampl>5.2 Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/121212.00-453633.0.png
|
2021-04-22 00:48:00
|
optical,cataclysmic variable,planet,transient,variables,request for observations
|
2021-04-22
|
00:48:00
| 908 |
[
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] | 14,564 |
14,567 |
Palomar Gattini-IR discovery of a peculiar, rapidly rising and highly reddened Galactic transient PGIR21fjn/AT2021kgk
|
R. Soria (UCAS/Sydney), K. De (Caltech), M. M. Kasliwal (Caltech), K. S. Tinyanont (Santa Cruz), R. M. Lau (ISAS/JAXA), M. Hankins (Caltech), J. Sokoloski (Columbia), M. Ashley (UNSW), A. Babul (Columbia), V. Karambelkar (Caltech), J. Jencson (Arizona), A. Moore (ANU), E. O. Ofek (Weizmann), M. Sharma (Columbia), J. Soon (ANU), T. Travouillon (ANU) on behalf of the Palomar Gattini-IR team
|
We report the discovery of a highly reddened Galactic transient by the Palomar Gattini-IR survey (Moore & Kasliwal 2019). Palomar Gattini-IR is a wide-field NIR transient survey scanning the entire visible sky every two nights to a depth of J ~ 15.7 AB mag (De et al. 2020). The source was identified as part of a dedicated filter to select large amplitude Galactic plane transients, as described in De et al. (2021). The source PGIR21fjn / AT2021kgk was first detected on UT 2021-04-19 at a magnitude of J = 12.28 +/- 0.01 Vega mag, at J2000 coordinates RA 19:07:58.625, Dec +08:43:45.14. It was not detected on UT 2021-04-18 to a depth of J ~ 14 Vega mag, thus constraining the transient to be ~ 2 days old. Subsequent data shows that it brightened to J ~ 9 Vega mag on UT 2021-04-21, confirming a rapidly rising transient. There is a quiescent counterpart in the UKIDSS DR6 Galactic Plane Survey (Lucas et al. 2012), with J = 17.50 +/- 0.02 Vega mag, H = 16.32 +/- 0.02 Vega mag, K = 15.61 +/- 0.02 Vega mag. There is also a quiescent detection in the Pan-STARRS PS1 catalog (Chambers et al. 2016), with z = 20.6 +/- 0.3 Vega mag, y = 19.8 +/- 0.1 Vega mag. A faint source is also seen in 2004 Spitzer images at 3.6 micron and 4.5 micron. Instead, there is no source at this position in archival 2MASS images. Based on the average between the UKIDSS and PS1 positions, the location of the quiescent counterpart is RA 19:07:58.65, Dec +08:43:45.3. The integrated extinction along this line of sight is ~ 23 mag in the g band and ~ 5 mag in the J band (Schlafly et al. 2011). On UT 2021-04-21, we obtained a low-resolution optical spectrum using the SED Machine Spectrograph on the Palomar 60-inch telescope (Blagorodnova et al. 2018). From the huge increase in J-band brightness (already almost 9 mag) we expected to see the spectrum of a nova. However, the spectrum shows a featureless and steep reddened continuum. We are unable to identify strong emission lines of the Balmer series or O I, typically seen in classical nova eruptions. Photometry from the SEDM guider camera suggests that the transient is at r ~ 17.5 mag, indicating a r - J color of ~ 8.5 mag. The nature of the source thus remains unclear, and we encourage rapid spectroscopic follow-up to identify its type.
|
2021-04-22 11:15:00
|
infra-red,optical,nova,transient,request for observations
|
2021-04-22
|
11:15:00
| 2,281 |
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] | 14,565 |
14,568 |
MAXI J0903-531: Detection of a 0.79d period with TESS
|
Rivera Sandoval, L. E. (U. Alberta), Maccarone, T. (TTU), Strader, J. (MSU)
|
MAXI J0903-531 is a newly discovered X-ray transient (ATel #14555, #14557, #14558, #14564). The optical counterpart has been classified as an early type star of the spectral type B1.5-2 III-V, with an average V-band magnitude from ASAS-SN of 13.3 mags (Atel #14564).
Due to its large brightness, the counterpart was detected by the Transiting Exoplanet Survey Satellite (TESS) on 2 different sectors, with start observation dates: 2019-02-02 and 2019-03-26. Each sector observed the target continuously for approximately 27 days and with a cadence of 30 min. A Lomb-Scargle analysis on the background subtracted light curves reveals a strong periodicity at 0.79d which is observed in both sectors. This period could correspond to non radial g-mode pulsations, which are commonly observed in early type stars. Though using the tables in Pecaut & Mamajek (2013, ApJS, 208, 9) we find that a B1.5-B2V star should undergo Roche lobe overflow for a period of 30-35 hours (and the period would be longer for an evolved Be star). Thus, it is possible that the TESS observed period could correspond to ellipsoidal variability, with the primary peak in the periodogram at half the orbital period for a binary just wider than Roche lobe overflow, but such a short period would be unprecedented for a Be X-ray binary. Then it is more likely that this period is a pulsation period or a rotation period, either of which is plausible for a Be star (Rivinius, 2005, Habilitationsschrift, Ruprecht-Karls Universitat). If the period is related to the orbit, it argues strongly against the evolved Be star possibilities. TESS observations in a third sector with start date 2019-02-28 seem to be affected by instrumental effects and therefore were discarded from the analysis.
We do not observe a peak in the periodogram at the 3.84d period reported in Atel #14564.
|
2021-04-22 11:48:00
|
optical,x-ray,binary,exoplanet,star,transient
|
2021-04-22
|
11:48:00
| 1,848 |
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] | 14,566 |
14,569 |
Archival OGLE-IV I-band photometry of MAXI J0903-531
|
A. Udalski (Warsaw U.), on behalf of the OGLE team
|
The field of MAXI J0903-531 was regularly monitored in the I-band by the OGLE survey from January 2017 until March 2020 when the OGLE observations were suspended due to the CoViD-19 pandemic. The OGLE light curve presented in the OGLE XROM System is flat up to mid-May 2019. After that the MAXI J0903-531 system brightened and stayed bright up to the end of the OGLE-IV monitoring in March 2020.
|
2021-04-22 17:51:00
|
optical,x-ray,transient
|
2021-04-22
|
17:51:00
| 395 |
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] | 14,567 |
14,570 |
Spectroscopic Follow-up Observation Report of PGIR21fjn/AT2021kgk (Perhaps a Classical Nova?)
|
Kenta Taguchi, Keisuke Isogai, (Kyoto University), Kosuke Namekata (National Astronomical Observatory of Japan), Yusuke Tampo, Naoto Kojiguchi (Kyoto University)
|
We report our spectrum of the highly reddened Galactic transient PGIR21fjn/AT2021kgk reported on ATel #14567. We obtained the spectrum from 2021-03-20.72 UT to 2021-03-20.74 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. Our observation was before ATel #14567 because we performed the observation soon after we noticed the discovery report posted to TNS.
Our spectrum is dominated by a highly reddened continuum with absorption features. There is a possible P Cygni feature of Hα (see page 2 and 3 of the PDF), whose deep absorption has its minimum at ∼ 6533 Å and whose weak emission component has its maximum at ∼ 6561 Å (So, if the feature is truly a P Cygni profile, its speed will be ∼ 1,280 km/s, consistent with a classical nova outburst). Also, probably emission lines are seen at 8545, 8598, 10049 Å (Paschen) and at 8227 Å (O I), however interstellar and/or telluric absorption feature is so strong nearby that we cannot judge whether they are truly emission lines.
To sum up, our spectrum and the amplitude of the outburst prefer that this object is a classical nova having the P Cygni profile of Hα. However the optical light is so weak, so further observations (especially infrared spectroscopy) are strongly encouraged.
|
2021-04-23 00:22:00
|
optical,cataclysmic variable,nova,transient,variables
|
2021-04-23
|
00:22:00
| 1,380 |
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] | 14,568 |
14,571 |
Swift/XRT observations of PGIR21fjn/AT2021kgk
|
B. O'Connor (George Washington University) and C. Kouveliotou (George Washington University)
|
Following the reported brightening of PGIR21fjn/AT2021kgk (ATel #14567), we initiated a Target of Opportunity (ToO) observation with the Neil Gehrels Swift Observatory. The observation started at 2021-04-22 17:05:28 and ended at 2021-04-22 20:31:26. Observations were carried out with the X-ray Telescope (XRT) in Photon Counting (PC) mode with a total exposure 4964.5 s. No source was found at the source location with a 3-sigma upper limit < 2.3e-3 cts/s. The upper limit on the 0.3-10 keV X-ray flux is < 2.8e-13 erg/cm^2/s (unabsorbed) for a power-law with photon index Gamma=2 and Galactic hydrogen column density N_H = 1.6e22 cm^-2 (Willingale et al. 2013). Observations with the Ultraviolet/Optical Telescope (UVOT) were carried out using the uvm2 filter (central wavelength: 225 nm) with a total exposure 4885.4 s. Using the UVOT data, we derive a 3-sigma upper limit uvm2 > 23 AB Magnitude (extracted in a 3" aperture). This value is not corrected for Galactic extinction. We thank the Swift team for rapidly approving and scheduling these observations.
|
2021-04-23 09:57:00
|
optical,ultra-violet,x-ray,nova,transient
|
2021-04-23
|
09:57:00
| 1,062 |
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] | 14,569 |
14,572 |
INTEGRAL observations of PGIR21fjn/AT2021kgk
|
V. Sguera (INAF-OAS Bologna, Italy), L. Sidoli (INAF-IASF Milano, Italy)
|
PGIR21fjn/AT2021kgk is a highly reddened Galactic infrared transient recently discovered by the Palomar Gattini-IR survey on 19 April 2021 (ATel #14567). Rapid follow-up observations were performed to identify its nature (ATels #14570, #14571).
|
2021-04-23 23:04:00
|
x-ray,transient
|
2021-04-23
|
23:04:00
| 244 |
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] | 14,570 |
14,573 |
Swift J1357.2-0933 as observed with Swift during its 2021 outburst
|
Aru Beri (IISER Mohali), B. E. Tetarenko (U. Michigan), Eric C. Bellm (U. Washington), Gregory R. Sivakoff (U. Alberta), Arash Bahramian (Curtin), J. Homan (Eureka Scientific and SRON), Rudy Wijnands (U. Amsterdam), Patrick Schmeer (AAVSO), A. J. Tetarenko (EAO), Payaswini Saikia, M. Cristina Baglio, D. M. Russell (NYU Abu Dhabi), Eleonora Caruso (NYU Shanghai), John. A Paice, Diego Altamirano (U. Southampton), Nathalie Degenaar (U. Amsterdam), T. D. Russell (INAF-Palermo), David Williams (U. Manchester), Rob Fender (Oxford, UCT), Matt. Middleton (U. Southampton), A. W. Shaw, Richard Plotkin (U. Nevada), J. V. Hernandez Santisteban (U. St. Andrews)
|
Swift J1357.2-0933 (J1357) is a peculiar black hole candidate X-ray transient discovered in outburst during 2011 (ATel #3138) and peaked at an X-ray luminosity of ~1e36 erg/s (for an assumed distance of 6 kpc). This source underwent the second outburst in 2017 (ATel #10297), and the peak value of the X-ray luminosity measured was ~6e35 erg/s (e.g. Beri et al. 2019 MNRAS 485 3064). A third outburst was reported in 2019 (ATel #12816, ATel #12821, ATel #12867). Unlike the previous outbursts of J1357, it peaked at a significantly lower X-ray luminosity of about 3e34 erg/s (Beri et al. 2021 submitted).
On 2021 April 10, J1357 was detected with the Zwicky Transient Factory (Bellm et al 2019 PASP 131 018002, ATel #14539, http://ooruri.kusastro.kyoto-u.ac.jp/mailarchive/vsnet-alert/25703 ) detected that the source had brightened optically (g~18.7) compared to limiting magnitudes in quiescence until 2021 April 07 (g~19.5) and has continuously increased in brightness since then (https://lasair.roe.ac.uk/object/ZTF19aanxwrq/).
We report on follow-up observations of J1357 with the Neil Gehrels Swift Observatory (Gehrels et al. 2004 ApJ 611 1005). We observed this source 7 times between 2021-04-11 04:59 UT and 2021-04-23 08:42 UT. Except for the first observation, UVOT observations were taken in the image mode, using the six available filters (v, b, u, uvw1, uvw2, uvm2). For all XRT observations, photon counting mode was used. Our first observation made on 2021-04-11 04:59 UT detected the source with Swift/UVOT in the Vega system: UVW1 = 18.34 +/- 0.28, but did not detect the source in X-rays (95% confidence upper-level limit on the unabsorbed flux is ~ 7E-14 erg/s/cm^2). The increasing optical/UV brightness detected by Swift can be seen at https://sites.google.com/view/swift-j13572-0933/home. On 2021-04-16 01:26 UT, the source was first detected in X-rays and three later observations have been performed. We extracted the X-ray data using the online XRT pipeline (Evans et al. 2009 MNRAS 397 1177). The X-ray data were fitted with an absorbed power-law model using W-statistics (background subtracted Cash statistics; Wachter et al. 1979 ApJ 230 274), where we fix N_H to 1.2E20 cm^2 (Armas Padilla et al. 2013 MNRAS 428 3083). The values of the photon index varied between 2.7+/-0.5 and 1.8+/-0.2. These values are consistent with the previous reports on this source (e.g., Beri et al. 2019 MNRAS 485 3064). The observed 0.5-10 keV fluxes and luminosities assume a 6 kpc distance are as follows:
The 2019 outburst started on March 20 at 10:30 UT (ATel #12803) but was reported only on May 22 (ATel #12796), while for the other two outbursts in 2011 and 2017 the source was first detected when it was already at g'=15.99, r'=16.30 (ATel #3140), V_CSS=16.7+/-0.1 (ATel#10297). Comparing our results for the current outburst with previous outbursts suggest that for the first time the source has been caught in the early, rising phase of an outburst. We will continue to monitor this source with Swift. Further multiwavelength observations are encouraged to trace the early rise of the system.
Acknowledgment: We thank the Swift team members for scheduling the ToO observations.
URL: https://sites.google.com/view/swift-j13572-0933/home
|
2021-04-25 10:34:00
|
optical,ultra-violet,x-ray,black hole,transient
|
2021-04-25
|
10:34:00
| 3,260 |
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] | 14,571 |
14,574 |
Spectroscopic confirmation of PGIR21fjn/AT2021kgk as a classical nova outburst
|
R. Soria (UCAS/Sydney), X. Liang (UCAS), J. Soon (ANU), K. De (Caltech), M. M. Kasliwal (Caltech), G. Da Costa (ANU), T. Nordlander (ANU), R. M. Lau (ISAS/JAXA), M. Hankins (Caltech), J. Sokoloski (Columbia), M. Ashley (UNSW), A. Babul (Columbia), V. Karambelkar (Caltech), J. Jencson (Arizona), A. Moore (ANU), E. O. Ofek (Weizmann), M. Sharma (Columbia), T. Travouillon (ANU) on behalf of the Palomar Gattini-IR team
|
On 2021-04-22 (20:34:48.8 UTC) we obtained an optical spectrum of the highly reddened transient PGIR21fjn/AT2021kgk that was discovered by the Palomar Gattini-IR survey (ATel #14567). The spectrum was taken with the Yunnan Faint Object Spectrograph and Camera, mounted on the Lijiang 2.4m telescope (Yunnan Observatories, Chinese Academy of Science), using grism Number 8, which covers the wavelength range 5100-9600 Ang with a resolution of about 4000 (1.5 Ang/pixel). The total exposure time was 2700 s and the effective airmass was 1.13. Images taken from the same telescope immediately after the spectral observations show that PGIR21fjn/AT2021kgk had an apparent brightness of (r = 17.5 +/- 0.1) Vegamag, i = (14.0 +/- 0.1) Vegamag. Earlier in the same night (2021-04-22 18:12:55.5 UTC) we obtained another spectrum of the same source with Wide-Field Spectrograph on the Australian National University's 2.3m telescope at Siding Spring Observatory (exposure time: 180 s; gratings: B3000/R3000; wavelength range: 3500-9500 Ang). The line measurements given below are derived from the Lijian telescope spectrum, but the results from the two calibrated spectra are perfectly consistent. We find a clear P-Cygni profile at Halpha, consistent with what was reported in ATel #14570. Gaussian deblending shows a peak of the absorption component at (6535.0 +/- 0.2) Ang and a peak of the emission component at (6558.1 +/- 0.1) Ang, for a velocity separation of (1060 +/- 5) km/s. The FWHM of the absorption component is (23 +/- 1) Ang, and FWHM = (49 +/- 1) Ang for the emission component. The EWs are (23 +/- 1) Ang and (-64 +/- 1) Ang for absorption and emission components, respectively. Another prominent P-Cyg line is OI 7774, for which we fit a velocity separation of (1120 +/- 110) km/s between absorption and emission peaks. The fluorescent line OI 8446 is weaker than the non-fluorescent OI 7774 (intensity ratio of about 1/4), but is also clearly detected with a P-Cyg profile, velocity separation of (850 +/- 150) km/s. Other clearly identifiable P-Cyg lines are NI 8747, OI 9118, OI 9261,9266, OI 9399 (for the last one, we infer a velocity separation of (1500 +/- 100) km/s). In addition, we see emission from a likely blend of OI 8233 and NI 8242, and from the Ca II triplet (CaII 8498,8452,8662). NaI 8183,8195 are seen in absorption. High reddening prevents an investigation of the lines bluewards of Halpha. Overall, the spectrum is consistent with a young classical nova outburst, which peaked at J = 9.1 Vegamag around April 22-23 and has now started to decline, based on the most recent Palomar Gattini-IR data. We encourage further spectroscopic follow-up for this young and rapidly evolving nova.
|
2021-04-26 13:11:00
|
infra-red,optical,nova,transient,request for observations
|
2021-04-26
|
13:11:00
| 2,715 |
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] | 14,572 |
14,575 |
Spectroscopic Confirmation of ASASSN-21gq = AT 2021klf = ZTF21aanfcmk as a gravitational micro-lensing event
|
Kenta Taguchi, Keisuke Isogai, Naoto Kojiguchi, Yusuke Tampo(Kyoto University)
|
We report our spectra of the transient ASASSN-21gq = AT 2021klf = ZTF21aanfcmk. We obtained the spectra from 2021-04-25.773 UT to 2021-04-25.788 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 reported to TNS, this object is discovered by ASAS-SN at g = 15.4 AB mag on 2021-04-24.260. There is a PS1 counterpart of g = 18.50, r = 17.77, i = 17.42, z = 17.24, and y = 17.07. Before the discovery by ASAS-SN, ZTF detected it at r ∼ 17.26 on 2021-02-24.54. After one month, ZTF detected it again at r = 16.80 on 2021-03-27.465 and g = 17.70 on 2021-03-27.503. Then, this object has been gradually rising for 2.5 mag, during which the g - r color remained almost constant (the last record of ZTF is r = 14.34 on 2021-04-24.416 and g = 15.18 on 2021-04-24.482).
Our spectra show a red continuum and Balmer (Hα and Hβ), the infrared Ca II triplet, Na I D, CH, and Fe I absorption lines. Such spectral features are consistent with a normal G-type star. The g - r color is also consistent with a normal G-type star. Based on our spectra, the almost-constant g - r color, and the profile of the light curve, we conclude that this object is a high-amplitude gravitational microlensing event.
|
2021-04-26 15:47:00
|
optical,microlensing event,star,transient,variables
|
2021-04-26
|
15:47:00
| 1,330 |
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] | 14,573 |
14,576 |
Correction to #14570: Spectroscopic Follow-up Observation Report of PGIR21fjn/AT2021kgk (Perhaps a Classical Nova?)
|
Kenta Taguchi, Keisuke Isogai (Kyoto University)
|
The observation date of ATel #14570 is not "from 2021-03-20.72 UT to 2021-03-20.74 UT", but "from 2021-04-20.723 UT to 2021-04-20.749 UT". We are sorry for the error. We appreciate the comments which pointed out our error and advice for sending this erratum.
|
2021-04-26 16:00:00
|
optical,cataclysmic variable,nova,transient,variables,a comment
|
2021-04-26
|
16:00:00
| 258 |
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] | 14,574 |
14,577 |
V1405 Cas (= PNV J23244760+6111140) now displaying Fe II emission
|
S. N. Shore (Univ. of Pisa), C. Buil, P. Dubovsky, P. Berardi, M. Bajer, C. Boussin, J. Guarrò, F. Teyssier, E. Bertrand, J. M. Viannet, D. Boyd, F. Boubault, H. Allen, M. Le Lain, P. le Dû, P. Cazzato, J. Coffin, K. Shank, E. Bressinck, O. Garde, K. Gurney, R. Leadbeater (ARAS Group)
|
We report that the slow nova Cas 2021 (V1405 Cas = PNV J23244760+6111140), discovered in outburst on 2021 Mar 18.4 (CBET #4945, ATel #14471, #14472, #14476, #14478, #14482, #14530) has begun to display Fe II absorption features. The nova has been continually monitored by ARAS observers with a variety of telescopes (ranging from 20 to 28 cm and with spectrographs ranging in resolution from about 518 to 9500 covering the optical interval from about 3400 - 7600 A since 2021 Mar. 19.7UT with an accumulated archive to date of over 90 spectra (all spectra and observational details are available from the ARAS archive website). The last spectrum to show no evidence for any Fe II absorption was obtained on 2021 Apr. 03.7UT; a very narrow emission at Fe II 5169 (FWZI ~ 100 km/s, vrad ~ 0 km/s) was present but the upper limit to any absorption at vrad> -2000 km/s was EW < 0.010 A) while on 2021 Apr. 6.7UT a strong, detached absorption was present (0.5 A) with a minimum at -1200 km/s (FWZI ~ 500 km/s), confirmed on Apr. 7.7UT). The absorption was both stronger (2.3 A) and broader (FWZI ~ 2000 km/s) on Apr 19.2UT; most strong optical of Fe II permitted showed similar profiles. In contrast, during the last observation, Si II 6347 showed very weak absorption and both Si II components continued to show the same narrow emission at vrad ~ 0 km/s as the Fe II lines. The P Cyg-like profiles on He I 4471, 5876, 6678, and 7065A showed the absorption component maximum radial absorption velocities of -1600 km/s contiguous with a broad emission component that extended to +1600 km/s (there was also enhanced emission at vrad ~ 0 km/s on these lines). Although absent on Apr. 14.8UT, Ca II K appeared in absorption on Apr.19.7 (vrad = -900 km/s, EW = 1.5A, no emission) and, aside from the Balmer, He I, Fe II, and Si II lines, the only other feature is a complex emission centered at around 6244 A (Fe II and Al II). The hydrogen series showed a systematic development. Although an absorption component on Halpha extending to -2500 km/s had been detected in the earlier spectra on Mar. 22UT, that had disappeared by Apr. 3 to be replaced by emission extending to the same velocity and a strong absorption core at about the same velocity as the He I and metal ion transitions, -1600 km/s; the blueward emission had vanished by Apr.22; the maximum emission velocity remains about -2000 km/s. The Balmer series in the last spectra, Apr. 19, showed a progression in the radial velocity of the absorption minimum from -1200 km/s at Halpha to -1000 km/s at Hdelta but with the same maximum velocities of -1600 km/s (absorption) and +2000 km/s (emission). Observations are continuing and will be available through the URL linked below.
|
2021-04-26 20:56:00
|
optical,nova,transient
|
2021-04-26
|
20:56:00
| 2,729 |
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0.018267041072249413,
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0.14544427394866943,
-0.0962425172328949,
-0.04810306802392006,
-0.009049354121088982
] | 14,575 |
14,578 |
Confirmation of spectroscopic classification of PGIR21fjn/AT2021kgk as a classical nova
|
N. Blagorodnova (Radboud University), F. Comeron (ESO, DE), D. Galadi-Enriquez (CAHA, Spain), S. Gongora (CAHA, Spain) J. Ardevol (University of Barcelona, UB), F. Asensio (UB), A. Caro (UB), M. Carretero (UB), M. del Alcazar (UB), J. Donada (UB), J. Garcia de la Torre (UB), J. Fernandez-Vilana (UB), C. Jimenez-Palau (UB), I. Mases (UB), J. Miro (UB), R. Prat (UB), C. Salas (UB), C. Soriano (UB), P. Bordas (UB), J. Carbajo (UB), D. del Ser (UB), A. Ferre-Mateu (UB), F. Figueras (UB), X. Luri (UB), O. Jimenez-Arranz (UB), T. Santana-Ros (UB)
|
We report our analysis on the spectrum of the highly reddened Galactic transient PGIR21fjn/AT2021kgk reported on ATel #14567. The data were obtained from 2021-04-23.06 UT to 2021-04-23.18 UT (~3.6 days after discovery) using CAFOS, the optical imager and low-resolution spectrograph of the 2.2m telescope at Calar Alto Observatory (CAHA; https://www.caha.es/telescope-2-2m/cafos).
The grism R400 was used, providing a resolution of R~250 per resolution element over the interval 500-1000 nm with a 1.5 arcsec slit. A relative flux calibration was carried out by observing the spectrophotometric standard BD+25 3941 with the same setup and through a similar airmass, in between two AT2021kgk exposures. Our estimated fluxes are ~5 mJy (m_AB ~ 14.6) in the immediate vicinity of the H alpha line, steeply rising to ~250 mJy (m_AB ~ 10.4) in a pseudo-continuum interval at 850 nm.
Once corrected for Galactic extinction of Av=18.528 mag (Schafly et al. 2011), the spectrum shows broad emission lines related to H, O I, N I, NII, Mg II, and possibly [Ar III] with P-Cygni profiles. The H alpha line is detected in emission with a FWHM ~1630 km/s (corrected for instrumental resolution) and a rest wavelength consistent with Galactic redshift. The P-Cygni profile of the line shows a minimum at ~-1900km/s. The classification is consistent with AT2021kgk being a Classical Nova, in agreement with ATel #14570,#14576 and ATel #14574.
The observations were part of the observational work of under-graduates and graduate students of the University of Barcelona while attending the Calar Alto Academy (https://www.caha.es/news/releases-mainmenu-163/11540-calar-alto-academy). We thank the Calar Alto staff for rapidly approving and scheduling these observations.
|
2021-04-27 00:02:00
|
optical,nova,transient
|
2021-04-27
|
00:02:00
| 1,756 |
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] | 14,576 |
14,579 |
Discovery of 9 ASAS-SN Supernova Candidates, Including 3 in the TESS Field of View
|
J. Brimacombe (Coral Towers Observatory), G. Masi (Virtual Telescope Project, Ceccano, Italy), B. Nicholls (Mt. Vernon Obs., New Zealand), 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), P. Marples (Leyburn Observatory, Australia)
|
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, particularly of the 3 TESS transients.
While we are participating in the TNS system to minimize potential confusion, ASAS-SN will continue using ASASSN-20xx 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-20xx (AT 2020xyz) 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.
|
2021-04-27 02:42:00
|
optical,supernovae,transient
|
2021-04-27
|
02:42:00
| 1,674 |
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] | 14,577 |
14,580 |
X-ray detection of the SLSN-I 2020tcw
|
D. Matthews, R. Margutti, D. Coppejans, G. Terreran, A. Hajela, A. Baldeschi, P. Blanchard, M. Stroh, R. Chornock, W. Jacobson-Galan (Northwestern U.), E. Berger, T. Eftekhari (Harvard U.), M. Nicholl (U. of Birmingham), D. Milisavljevic (Purdue U.), C. Guidorzi (U. degli Studi di Ferrara), B. Metzger (Columbia U.), L. Herzog (Ohio U.), B. Zauderer (NSF), A. MacFadyen (New York U.)
|
We report the first X-ray detection of SN2020tcw with the Chandra X-ray Observatory (CXO) at 60 days post-discovery (program #21500443, PI Margutti). SN2020tcw was discovered on September 12th 2020 (Tonry et al., TNS Astronomical Transient Report No. 81951) and classified as a hydrogen-poor super-luminous supernova (Perley et al., AstroNote 2020-192) at a redshift of z~0.0645 (d~291 Mpc).
|
2021-04-28 04:52:00
|
x-ray,supernovae,transient
|
2021-04-28
|
04:52:00
| 391 |
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] | 14,578 |
14,581 |
Fermi-LAT detection of gamma-ray flaring activity from the radio galaxy 3C 111
|
G. La Mura (LIP), R. Angioni (SSDC/INFN), C. C. Cheung (NRL), E. Torresi (INAF-OAS Bologna) on behalf of the Fermi Large Area Telescope Collaboration
|
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with the FRII (Fanaroff & Riley 1974, MNRAS, 167, 31) Broad Line Radio Galaxy 3C 111, also known as 4FGL J0418.2+3807 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A. = 64.653 deg, Decl. = +38.028 deg (J2000; Fey et al., 2004, AJ, 127, 3587), and redshift z=0.0491 (Eracleous & Halpern, 2004, ApJS, 150, 181). This source has shown rare and intense flares in the past (e.g. Grandi et al. 2012, ApJ, 751, 3).
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on 2021-04-26, with a daily averaged gamma-ray flux (E>100MeV) of (8+/-2) X 10^-7 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of about 20 relative to the 10-year average flux reported in the second data release of the fourth Fermi-LAT catalog (4FGL-DR2; Ballet et al., arXiv:2005.11208). The corresponding photon index is 1.8+/-0.2, and is significantly smaller than the 4FGL-DR2 value of 2.74+/-0.06. The hard-spectrum state was accompanied by the detection of a photon with an energy of 10 GeV with probability >99% of being emitted by 3C 111, at 2021-04-26 02:57:46 UTC.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue. Target of opportunity observations with the Neil Gehrels Swift Observatory have been proposed. We encourage further multifrequency observations of this source. For this source, the Fermi-LAT contact person is Giovanni La Mura ([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.
|
2021-04-28 06:01:00
|
radio,gamma ray,agn,request for observations
|
2021-04-28
|
06:01:00
| 1,971 |
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] | 14,579 |
14,582 |
Low level optical activity in MAXI J1820+070
|
M. Cristina Baglio (NYU Abu Dhabi), Jeroen Homan (Eureka Scientific & SRON), David M. Russell, Payaswini Saikia, D. M. Bramich (NYU Abu Dhabi), Fraser Lewis (Faulkes Telescope Project & Astrophysics Research Institute, LJMU), Paul Roche (Cardiff University), Thabet Al Qaissieh, Aldrin Gabuya, Alejandro Palado (Al Sadeem Observatory, Abu Dhabi)
|
The black hole X-ray binary MAXI J1820+070 recently showed signs of new outburst activity at optical wavelengths (ATel #14492) between 2021 March 7 and 20. Similarly, an increase in the 0.5-10 keV flux by a factor of ~3-4 was observed by Swift/XRT on 2021 March 29 (ATel #14495), which indicated that outburst activity had also started in X-rays.
Since then, we have monitored the system regularly with the 1m and 2m optical telescopes of the Las Cumbres Observatory (LCO) network (see e.g. ATel #11418, #12128, #12534), as part of an ongoing monitoring program of ~50 low mass X-ray binaries (LMXBs; Lewis et al. 2008).
The optical re-brightening had a first peak on MJD 59300-59301 (Mar 27-28; V=17.72 +/- 0.01, R=17.13 +/-0.01, i'=17.12 +/- 0.09; see ATel #14492), then faded on MJD 59318 (Apr 14) to magnitudes of: g'=18.02 +/- 0.04, r'=17.50+/-0.01, i'=17.27 +/- 0.01. However, on MJD 59326 (Apr 22) the flux was brighter again in all bands: g'=17.51+/-0.01, r'=17.07+/-0.01, i'=16.87+/-0.01. This flux rise is more dominant at the highest frequencies, suggestive of an increasing disc component. Due to a gap in the monitoring between MJD 59318 and 59326, it is not possible to determine the exact time of the start of this rise with our LCO monitoring.
The system was also observed with the Meade LX850 16-inch (41-cm) telescope of the Al Sadeem Observatory (UAE), as part of monitoring that started in 2018, using the 'blue', 'green' and 'red' Baader LRGB CCD-Filters (that approximately correspond to the central wavelengths of the g', V and R filters, respectively; see ATel #11533 and Russell et al. 2019 for details). On MJD 59320 (Apr 16) and MJD 59323 (Apr 19), the g'-band flux was very similar to the previous LCO fluxes: g'=17.92+/-0.11, V=17.48+/-0.10, R=16.92+/-0.07 on Apr 16; g'=17.89+/-0.08, V=17.49+/-0.08, R=16.89+/-0.05 on Apr 19. Combining the LCO and Al Sadeem monitoring, we are therefore able to constrain the date of the start of the new rise to between MJD 59323.9 and MJD 59326.5.
The last LCO observations, performed on MJD 59331 (Apr 27) reveal a new decrease in flux, with magnitudes: g'=18.09+/-0.02, r'=17.61+/-0.01, i'=17.35+/-0.01. However, the current magnitudes are still significantly brighter than the known quiescent magnitudes of the source according to the PanSTARRS catalogue (see ATel#14492), suggesting that some low-level activity is still ongoing.
The brief re-brightening was also seen in the UVOT, with the following magnitudes (AB system): V=17.15+/-0.18, V=17.64+/-0.15 and V= 17.5+/-0.14 (Apr 7, 9, 10 respectively); UVW1= 19.19+/-0.06, UVW1=18.37+/-0.06, UVW1=19.14+/-0.06 on Apr 1, 5, 17, respectively.
Swift/XRT observations were performed between March 29 and April 17. The per-observation-averaged count rates were variable by factors of up to 4 and no clear trend could be seen during the nearly three weeks of X-ray coverage. On average the count rates were a factor of ~3 above the count rates measured in February 2021. The highest observed flux was observed on April 15: (1.4+/-0.4)e-12 erg/cm^2/s (0.5-10 keV, unabsorbed). The Swift/XRT monitoring will resume soon.
The optical monitoring of MAXI J1820+070 with LCO and the Al Sadeem Observatory telescope is ongoing. The analysis of the LCO data are performed with a new real-time data analysis pipeline, the ''X-ray Binary New Early Warning System'' (XB-NEWS; see Russell et al. 2019 and Goodwin et al. 2020 for details). We acknowledge the support of the NYU Abu Dhabi Research Enhancement Fund under grant RE124. We thank the Swift team for scheduling and performing the daily observations.
|
2021-04-28 14:11:00
|
optical,ultra-violet,x-ray,binary,black hole,transient,variables
|
2021-04-28
|
14:11:00
| 3,618 |
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] | 14,580 |
14,583 |
Fermi-LAT detection of enhanced gamma-ray activity from BL Lac
|
G. La Mura (LIP) on behalf of the Fermi Large Area Telescope Collaboration
|
The Large Area Telescope (LAT), one of the two instruments on the Fermi Gamma-ray Space Telescope, has observed enhanced gamma-ray activity from a source positionally consistent with BL Lacertae, also known as 4FGL J2207.1+4316 (The Fermi-LAT collaboration 2020, ApJS, 247, 33), with coordinates R.A.=22:02:43.29137 Dec.=+42:16:39.9799 (J2000; Beasley et al. 2002, ApJS, 141, 13), and redshift z=0.0686 (Vermeulen et al., 1995, ApJ, 452, L5).
Preliminary analysis indicates that this source was in an elevated gamma-ray emission state on 2021-04-27, with a daily averaged gamma-ray flux (E>100MeV) of (7.7+/-0.3) X 10^-6 photons cm^-2 s^-1 (statistical uncertainty only). This corresponds to a flux increase of a factor of 33 relative to the 10-year average flux reported in the 2nd data release of the fourth Fermi-LAT catalog (4FGL-DR2, Ballet et al., arXiv:2005.11208). The source was detected with a peak flux of (17.5+/-1.1) X 10^-6 photons cm^-2 s^-1 during 0:00-6:00 UTC on that day. This is the highest LAT flux ever observed for this source. The corresponding photon index is 1.89+/-0.03, and is smaller than the 4FGL value of 2.20+/-0.01, similar to what was observed in a previous event (ATel #14330). The highest energy photon associated with the source had an energy of 26 GeV, an association probability larger than 0.99, and was recorded at 19:21:10 UTC on 2021-04-27.
Because Fermi normally operates in an all-sky scanning mode, regular gamma-ray monitoring of this source will continue and consequently, a preliminary estimation of the daily gamma-ray flux observed by Fermi-LAT will be 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 is Simone Garrappa (simone.garrappa at desy.de).
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.
|
2021-04-29 10:08:00
|
gamma ray,agn,blazar
|
2021-04-29
|
10:08:00
| 2,111 |
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] | 14,581 |
14,584 |
MASTER OT J115510.13-442218.6: new OT with ampl>6.2m
|
P. Balanutsa, V. Lipunov, V. Kornilov (Lomonosov MSU), R. Podesta, F. Podesta (OAFA), O. Gress(ISU), I. Gorbunov, E. Gorbovskoy, N. Tyurina, T. Pogrosheva, K. Zhirkov, A. Kuznetsov, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, V. Shumkov, A. Chasovnikov, E. Minkina, V. Topolev, D. Kuvshinov, F. Balakin(Lomonosov Moscow State University), C. Lopez, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), D. A.H. Buckley (SAAO), 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 J115510.13-442218.6 discovery - no known sources in VIZIER database, ampl>6.2
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 11h 55m 10.13s -44d 22m 18.6s on 2021-04-29.25038 UT. The OT unfiltered m=15.8m (mlim=18.0). The OT is seen in 2 images. There is no minor planet at this place. We have reference image on 2018-03-24.24529 UT with unfiltered mlim= 19.8m. There is no any sources in VIZIER, it means 22m POSS limit (MASTER unfiltered is calibrated by USNO-B1 as 0.2B+0.8R) and current amplitude more then 6.2m Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/115510.13-442218.6.png
|
2021-04-30 02:10:00
|
optical,cataclysmic variable,planet,transient,variables,request for observations
|
2021-04-30
|
02:10:00
| 778 |
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] | 14,582 |
14,585 |
Spectra and morphological structures in the inner coma of comet C/2020 R4 (ATLAS)
|
Firstname1 La Federico Manzini (Stazione Astronomica di Sozzago), Paolo Ochner (University of Padova), Virginio Oldani (Stazione Astronomica di Sozzago), Luigi R. Bedin (OAPD-INAF)stname1 (Affil1), Firstname2 Lastname2 (Affil2)...
|
We followed comet C/2020 R4 (ATLAS) for three nights from April 22, 2021, with a resolution of 270 km/pixel with the 0.4 m Cassegrain at the Sozzago Astronomical Station (Italy - MPC A12) and with the 1.22m Galileo telescope at the Asiago Astrophysical Observatory-University of Padua (Italy - MPC 098). Following an enhancement processing of the faint details and of the brightness gradients of the inner coma, our CCD images of April 22.9 UT showed a prominent morphological structure, attributable to at least one large active area located on the cometary nucleus. The comet was at the minimum distance from Earth of its path through the inner solar system, at an angle of -33° between the Earth and its orbital plane. The structure looks like a jet/fan in PA 100° with respect to the optocenter of the comet. The analysis of the images taken in Bj, Vj, Rj (preliminarily calibrated) clearly shows a reddening of the nucleus. An isophote visualization of the original images also highlights a clear asymmetry of the area east of the nucleus, corresponding to the jet described above (see images). This may suggest a strong activity modulated by nucleus rotation. Spectra obtained on April 23 and 24, 2021 with the Galileo telescope show the typical cometary emissions with evidence of NH at 3360 Ã
, CN at 3880 Ã
, OI at 6300 and 6364 Ã
and the Swan bands due to C2 and C3. The average of the fluxes of CN and OI in the calibrated spectra provides the following values: CN 2021.04.23.95 UT 2.25*10-12 erg cm-2 s-1 Ã
-1; CN 2021.04.24.95 UT 5.16*10-12 erg cm-2 s-1 Ã
-1; OI 2021.04.23.95 UT 0.97*10-13 erg cm-2 s-1 Ã
-1 OI; 2021.04.24.95 UT 2.60*10-13 erg cm-2 s-1 Ã
-1. The flux appears to have doubled between the two days, after only 24 hours, perhaps connected with the rotation of the nucleus. Figures and extra material at https://web.oapd.inaf.it/bedin/files/PAPERs_eMATERIALs/ATel/C2020R4/
|
2021-04-30 04:47:00
|
optical,comet
|
2021-04-30
|
04:47:00
| 1,902 |
[
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] | 14,583 |
14,586 |
MASTER: OT with ampl>7m and other
|
T. Pogrosheva, Y. Kechin, A. Pozdnyakov, P. Balanutsa, V. Lipunov, V. Kornilov (Lomonosov MSU), R. Podesta, F. Podesta (OAFA), O. Gress(ISU), I. Gorbunov, E. Gorbovskoy, N. Tyurina, K. Zhirkov, A. Kuznetsov, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, V. Shumkov, A. Chasovnikov, E. Minkina, V. Topolev, D. Kuvshinov, F. Balakin(Lomonosov Moscow State University), C. Lopez, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), D. A. H. Buckley (SAAO), 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 J150231.16-830149.5 detection - outburst with amplitude more then 7m
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 15h 02m 31.16s -83d 01m 49.5s on 2021-04-29.33208 UT. The OT unfiltered is 14.0m (mlim=18.1). The OT is seen in 15 images. There is no minor planet at this place. We have reference images at 2019-02-16.29597 UT with unfiltered mlim=20.3m, at 2021-04-07 05:14:19UT with unfiltered mlim=20.0, at 2016-08-04 07:06:12UT with mlim=21.12 (MASTER-SAAO). It means, current outburst amplitude is more then 7m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/150231.16-830149.5.png
MASTER OT J111652.54-551234.2 discovery
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 11h 16m 52.54s -55d 12m 34.2s on 2021-04-28.95340 UT. The OT magnitude in unfilter is 16.2m (mlim=18.5). The OT is seen in 6 images. There is no minor planet at this place. We have reference image on 2019-01-09.19553 UT with unfilter 18.2m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/111652.54-551234.2_1.png
MASTER OT J111652.54-551234.2 discovery
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 11h 58m 36.79s -56d 55m 18.8s on 2021-04-27.79653 UT. The OT unfiltered magnitude is 16.7m (mlim=18.7). The OT is seen in 3 images. There is no minor planet at this place. We have reference image on 2014-12-23.01082 UT with unfiltered mlim= 20.6m. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/115836.79-565518.8.png
Current outburst
MASTER OT J045959.38-473808.5 ( AT2018bbc ) outburst detection at 2021-04-29.75788 UT with m_OT=15.9(unfiltered). The detection and reference images are available at: http://master.sai.msu.ru/static/OT/045959.38-473808.5.png
|
2021-05-01 00:53:00
|
cataclysmic variable,nova,planet,supernovae,transient,variables,request for observations
|
2021-05-01
|
00:53:00
| 2,196 |
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] | 14,584 |
14,587 |
MAXI/GSC detection of a new X-ray transient MAXI J1803-298
|
M. Serino (AGU), 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, W. Iwakiri, H. Kawai, Y. Okamoto, S. Kitakoga (Chuo U.), M. Shidatsu (Ehime U.), N. Kawai, R. Adachi, 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) report on behalf of the MAXI team
|
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 19:50 UT on 2021 May 1. Assuming that the source flux was constant over each transit, we obtain the source position at
(R.A., Dec) = (270.923 deg, -29.804 deg) = (18 03 41, -29 48 14) (J2000)
with a statistical 90% C.L. elliptical error region with long and short radii of 0.31 deg and 0.26 deg, respectively. The roll angle of long axis from the north direction is 71.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). We name the source MAXI J1803-298. The source was not significant before 12 UT on May 1, and the source flux has increased rapidly since then. The flux at 22:55 was 46+-18 mCrab in 4-10 keV. We encourage followup observations.
|
2021-05-02 08:51:00
|
x-ray,nova,transient
|
2021-05-02
|
08:51:00
| 793 |
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0.020515991374850273,
-0.06063522771000862,
-0.01410431507974863,
0.07080338895320892
] | 14,585 |
14,588 |
NICER detection of the new X-ray transient MAXI J1803-298
|
K. Gendreau, Z. Arzoumanian (NASA/GSFC), T. Enoto, T. Mihara (RIKEN), W. Iwakiri (Chuo U.), H. Negoro (Nihon U.), M. Saylor, J. Pope (KBRwyle), B. Trout (MICROTEL)
|
Following the MAXI/GSC alert of a possible new transient (ATel #14587), NICER performed a raster scan to localize the source position from 2021-05-02T03:36 (UTC). Starting from the nominal coordinates reported by MAXI, NICER performed a series of offset pointings with about 15 s exposure for each. The preliminary source position was obtained at R.A. = 270.80 deg Dec = 29.80 deg (J2000), with 3 arcmin radius uncertainty set by the NICER field of view. The averaged X-ray flux is about 70 mCrab in the NICER energy band (0.2 - 12 keV). The observed X-ray flux was variable. We need to continue the observation to confirm the intrinsic variability. Further NICER observations of this source are underway. Additional 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.
|
2021-05-02 20:56:00
|
x-ray,transient,variables
|
2021-05-02
|
20:56:00
| 943 |
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] | 14,586 |
14,589 |
Correction to #14588
|
K. Gendreau, Z. Arzoumanian (NASA/GSFC), T. Enoto, T. Mihara (RIKEN), W. Iwakiri (Chuo U.), H. Negoro (Nihon U.), M. Saylor, J. Pope (KBRwyle), B. Trout (MICROTEL)
|
The source position of MAXI J1803-298 was wrongly reported in ATel #14588. We forgot to write a minus sign in the DEC coordinates. The following coordinates are correct: R.A. = 270.80 deg Dec = -29.80 deg We apologies for any confusion.
|
2021-05-02 21:45:00
|
x-ray,transient
|
2021-05-02
|
21:45:00
| 236 |
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] | 14,587 |
14,590 |
Spectral Features of YSO Outburst Gaia 21bty
|
Lynne A. Hillenbrand (Caltech)
|
As described at this URL, while the nature of the recent mid-infrared and optical brightening of Gaia 21bty is still ambiguous, spectroscopic evidence of mixed-temperature absorption lines plus wind-like profiles including P Cygni CaII triplet lines, suggests similarity to young FU Ori type stars.
Gaia 21bty (17:25:14.19 -37:08:14.17) was designated in a Gaia Alert (Hodgkin 2013) as a candidate outbursting YSO after the source brightened optically from G=20.1 on 2020-10-02, to G=17.3 by 2021-02-17. The amplitude is therefore nearly 3 mag on a timescale of less than 4.5 months (137 days). Previous variability had been exhibited, ranging between G=20-21 mag.
The NEOWISE (Mainzer et al. 2014) lightcurve also shows a brightening, but with the mid-infrared rise beginning at an earlier epoch. Between 2019-08-24 and 2020-08-22 (MJD 58719.9 to 58920.2 to 59083.7) Gaia 21bty increased in brightness by 0.3 mag in W1 and 0.5 mag in W2. During this year-long interval, the W1-W2 color also became redder by about 0.2 mag, after having drifted blueward over the previous two years.
On 2021-05-01 an optical spectrum was taken of Gaia 21bty with Keck/ESI (Sheinis et al. 2002) at R=8000. An exposure of 1800 sec produced continuum S/N ~40 at the CaII triplet but only ~5 at Halpha, with little signal at shorter wavelengths.
The Halpha profile has double-peaked emission, with a central absorption reaching to the continuum level and a red-to-blue flux ratio of 2.5. The CaII triplet profiles have a clear P Cygni structure, with the absorption component narrow. There is also wind-like absorption in the profiles of KI 7669, 7699 A and the OI 7773 A triplet. Other strong absorption features include OI 8446, FeI 8688 A, MgI 8806 A, and FeI 8824 A. There are indications of the TiO bandheads at 8860 and 8432 A, but no shorter wavelength TiO is apparent.
In the above and other regards, the far red optical absorption spectrum of Gaia 21bty is strikingly similar to spectra of Gaia 18dvy (Szegedi-Elek et al., 2020) and Gaia 17bpi (Hillenbrand et al. 2017), both of which are FU Ori type objects. The Gaia 21bty spectrum is dissimilar to that of standard K-M type T Tauri stars having low accretion (veiled-photosphere-dominated) to high accretion (continuum-plus-emission-dominated) rates.
Gaia 21bty is located in a dark region adjacent to a nebulous area that was designated as a small bubble by Simpson (2012). The source was cataloged as a candidate young stellar object by Marton (2017) and also included in Vioque (2020). It is otherwise unstudied, heretofore.
|
2021-05-03 02:09:00
|
infra-red,optical,pre-main-sequence star,star,variables,young stellar object
|
2021-05-03
|
02:09:00
| 2,574 |
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0.007658418733626604,
0.12348043918609619,
-0.13587287068367004,
-0.1025046706199646,
0.02186819165945053
] | 14,588 |
14,591 |
Swift Detection of MAXI J1803-298 including an optical counterpart
|
J. D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
|
This is cross posted from GCN #29925.
At 17:39:33 UT, the Swift Burst Alert Telescope (BAT) triggered and located MAXI J1803-298 (trigger=1046414). Swift slewed immediately to the source. The BAT on-board calculated location is RA, Dec 270.742, -29.818 which is RA(J2000) = 18h 02m 58s Dec(J2000) = -29d 49' 05" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the available BAT light curve shows no significant structure.
The XRT began observing the field at 17:46:59.5 UT, 446.4 seconds after the BAT trigger. XRT found a bright X-ray source located at RA, Dec 270.7590, -29.8302 which is equivalent to: RA(J2000) = 18h 03m 2.16s Dec(J2000) = -29d 49' 48.7" with an uncertainty of 5.9 arcseconds (radius, 90% containment). This location is 68 arcseconds from the BAT onboard position, within the BAT error circle and consistent with being MAXI J1803-298. No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 7.51e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 454 seconds after the BAT trigger. There is a candidate counterpart in the rapidly available 2.7'x2.7' sub-image at RA(J2000) = 18:03:02.79 = 270.76162 DEC(J2000) = -29:49:49.7 = -29.83046 with a 90%-confidence error radius of about 0.61 arc sec. This position is 8.2 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.82 with a 1-sigma error of about 0.14. No correction has been made for the large, but uncertain, extinction expected.
|
2021-05-03 02:11:00
|
optical,x-ray,transient
|
2021-05-03
|
02:11:00
| 1,654 |
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] | 14,589 |
14,592 |
ASKAP low-band interferometric localisation of the FRB 20201124A source
|
C. K. Day (Swinburne University of Technology, SUT; CSIRO), S. Bhandari (CSIRO), A. T. Deller (SUT), R. M. Shannon (SUT), on behalf of the ASKAP-CRAFT survey science project.
|
The Australian Square Kilometre Array Pathfinder (ASKAP) has detected multiple bursts from the repeating FRB 20201124A source (ATel #14502, ATel #14508). We have previously reported a burst localisation using the second burst detected by ASKAP (ATel #14508).
Here we provide an update on the localisation of the FRB 20201124A source using the first burst detected at 864.5 MHz with ASKAP. The interferometric localisation of this burst proceeded identically to the previously reported burst, using methods described in Bannister et al. (2019, Science, 365, 565).
The newly analysed burst was localised to the following best-fitting position (epoch J2000): RA: 05h08m03.475s DEC: +26d03m38.44s We estimate the total uncertainty ellipse to be 1.25"x0.67", PA 140 deg. We also slightly revise our high-band position originally reported in ATel #14515 (epoch J2000): RA: 05h08m03.665s DEC: +26d03m39.50s and make an updated (and larger) estimate of its total uncertainty ellipse to be 1.55"x0.91", PA 42 deg. The reason for this revision is detailed below.
Our low-band burst position is consistent with the localisation reported using the VLA/realfast and uGMRT observations (ATel #14526, ATel #14538). The high-band burst position remains offset by 2.6" from the best-fit location of our low-band burst and those reported by other facilities, a disagreement of up to ~1.5-2 sigma.
The total uncertainty in the burst position comprises a statistical component (dependent on the S/N of the FRB image) and a systematic component related to the uncertainty of the astrometric frame registration. The reference frame correction, and its associated uncertainty, were derived by comparing positions of background sources detected in the 3-s voltage download containing the FRB) with catalogue counterparts, in this case from the NVSS (Condon et al. 1999, AJ, 115,1693).
A detailed investigation into the discrepancies found between the two independently obtained ASKAP positions is ongoing. Below, we list relevant information already identified:
To account for the elliptical beam shape in these two bursts, we derive the reference frame correction (and its uncertainty) in a rotated frame that is aligned with the synthesised beam major axis. We then account for the larger-than-expected scatter between the reference frame source offsets by applying a scale factor (which is close to 3 in each case) to the final systematic uncertainty.
The results of the full investigation will be reported in a forthcoming paper, once the analysis of a further 3 bursts (i.e., a total of 5) detected from this source by ASKAP is completed.
|
2021-05-03 14:55:00
|
radio,fast radio burst
|
2021-05-03
|
14:55:00
| 2,626 |
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] | 14,590 |
14,593 |
Spectroscopic observation of the unusual variable ASASSN-21gk
|
Keisuke Isogai, Taichi Kato, Kenta Taguchi (Kyoto University), Franz-Josef Hambsch (GEOS, BAV, VVS)
|
We report on spectral features seen in the unusual variable ASASSN-21gk on 2021-05-02.661 UT obtained by using a 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 already reported to vsnet-alert 25757 by Patrick Schmeer, the unusual activity was discovered at 2021-04-18.39 UT by ASAS-SN as a possible weird CV (Shappee et al. 2014). According to the PS1, the optical counterpart is g = 13.78, r = 13.18, i = 12.96, z = 12.83, and y = 12.82. The overall light curve of the ASAS-SN Sky patrol shows that this object had been stable at least for several years but the brightness started to change from 2021-04-14 (Kochanek et al. 2017). See also the enlarged light curve. Then, we reported that this object has oscillated on a timescale of one day and indicated that similar activity was also seen in ASASSN-20da (vsnet-alert25781, 25787).
ASASSN-20da had also been stable but brightened from g = 12.5 to 11.9 for several days in May 2020 (see the light curve of the ASAS-SN Sky Patrol). This object also showed slow modulations with a possible period of 0.61571(8) d (vsnet-alert 25790). Aydi et al. reported the spectrum of the object (ATel #13573). However, their spectral features imply a normal star, and hence the nature of the activity has been unclear. Possibly, it may be worth noting that the amplitude of the modulations gradually decayed in the fading stage.
To compare with ASASSN-20da, we obtained a spectrum of ASASSN-21gk on 2021-05-02.661 UT. Our spectrum shows Balmer, Na DI, Fe I absorption lines. These lines and the profile of the continuum suggest that this object is likely to be a normal (F or G-type) star in common with ASASSN-20da. Although the nature is still unclear, these objects may represent a new type of variable stars. Follow-up photometry and spectroscopy are encouraged.
|
2021-05-03 14:59:00
|
optical,binary,star,transient,variables
|
2021-05-03
|
14:59:00
| 1,941 |
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0.01666766218841076
] | 14,591 |
14,594 |
Optical follow-up of MAXI J1803-298
|
R. Hosokawa, K. L. Murata, M. Niwano, N. Ito, H. Takamatsu, Y. Imai, S. Sato, M. Takaku, R. Noto, R. Yamaguchi, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration
|
We report on optical observation of the newly discovered transient MAXI J1803-298 (ATel #14587, #14588, #14591, GCN Circular 29924, 29925, 29926). Following the Swift/BAT trigger (trigger=1046414, GCN Circular 29925) related to MAXI J1803-298, we observed the field with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Okayama Astrophysical Observatory, Okayama, Japan. The observation with a series of 60 sec exposures started at 2021-05-02 17:56:06 UT. We marginally detected a source in Rc and Ic band at the position of the optical counterpart candidate identified by Swift/UVOT (ATel #14591, GCN Circular 29925). We performed forced photometry and obtained the preliminary magnitudes as follows: Rc=15.9+/-0.4, Ic=15.6+/-0.4 on 2020-05-02 (MJD 59336.77509). We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire). We will continue simultaneous multi-color observation with the MITSuME 50cm telescope.
|
2021-05-03 16:11:00
|
optical,transient
|
2021-05-03
|
16:11:00
| 1,165 |
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] | 14,592 |
14,595 |
Stringent upper limits to the mass-loss rate of the Type Ia SN 2021hiz from e-MERLIN radio observations
|
M. Perez-Torres (IAA-CSIC, Granada), J. Moldon (IAA-CSIC, Granada; JBCA, Manchester), P. Lundqvist (Stockholm University), D. Venkattu (Stockholm University), on behalf of a larger collaboration.
|
We report the non-detection at radio wavelengths of the Type Ia SN 2021hiz, discovered on 2021-03-30 08:36:49.003 UT at the position RA(J2000.0)=12:25:41.675, DEC(J2000.0)=+07:13:42.26 (ATel #14500). SN 2021hiz exploded in the galaxy IC 3322A (z=0.0033; D=19 Mpc), and was identified with a Type Ia SN about 15 days before its maximum light (ATel #14500).
We observed SN 2021hiz on 2021-04-07 UT and 2021-04-08 UT, in both occasions from 00:10 till 04:50 UT, using the electronic Multi-Element Radio Linked Interferometer Network (e-MERLIN), including the Lovell telescope. We observed SN 2021hiz at a central frequency of 5.1 GHz, using a bandwidth of 512 MHz, and obtained an angular resolution of about 50 milliarcseconds. We found no evidence of radio emission in a circular region of about 5.0 arcsec in radius surrounding SN 2021hiz in either epoch, above a 3-sigma upper limit of 63 and 75 microJy/beam, respectively, which correspond to upper limits to the monochromatic luminosity of 2.7E25 and 3.2E25 erg/s. Assuming that SN 2021hiz exploded on March 27.0 UT, our radio observations were then carried out 11 and 12 days after the explosion.
For our standard model with a presupernova wind speed of 100 km/s (see ATels #11324, #12411, #14325) the above limits to the radio luminosity correspond to upper limits of 3.0E-8 and 3.6E-8 solar masses per year for the mass-loss rate on May 7 and May 8, 2021. The stacked data yielded a 3-sigma upper limit of 16 microJy/beam (radio luminosity limit of 2.1E25 erg/s), which results in a mass-loss rate upper limit of 2.5E-8 solar masses per year. Those upper limits to the mass-loss rate of SN 2021hiz are among the most stringent upper limits found for type Ia SNe, especially in view of the distance to the host galaxy, showing the importance of probing the radio emission from type Ia SNe within a radius of about 25 Mpc.
e-MERLIN is a National Facility operated by the University of Manchester at Jodrell Bank Observatory on behalf of STFC.
|
2021-05-03 20:44:00
|
radio,supernovae
|
2021-05-03
|
20:44:00
| 1,999 |
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] | 14,593 |
14,596 |
Spectroscopic Classifications of Optical Transients with the Lick Shane telescope
|
T. Hung, R. J. Foley (UCSC)
|
We report the following classifications of optical transients from spectroscopic observations with the Kast spectrograph on the Shane telescope. Targets were supplied by ZTF. All observations were made on 2021 May 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 -11,100 km/s. (2) We measure an Si II 6355 velocity of -10,900 km/s.
|
2021-05-03 22:52:00
|
optical,supernovae,transient
|
2021-05-03
|
22:52:00
| 564 |
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] | 14,594 |
14,597 |
SALT spectroscopy of the optical counterpart to MAXI J1803-289
|
D. A. H. Buckley (South African Astronomical Observatory/University of Cape Town), J. Brink (UCT), P. A. Charles (University of Southampton), Daniel Groenewald (SAAO/SALT)
|
On 2021 May 2, beginning at 22:56 UTC, we obtained two consecutive 1200 s exposures with the Robert Stobie Spectrograph on the Southern African Large Telescope (SALT) of the proposed optical counterpart of the new X-ray transient, MAXI J1803-289 (ATel #14587 and ATel #14588), reported by Gropp et al. (ATel #14591). The combined spectra cover the region 3500-7300Å, at a mean resolution of 5.7Å. We see emission features consistent with Bowen fluorescence and HeII 4686Å emission (both with E.W.s of about -3Å), plus an Hα P Cyg-like emission line with an E.W. of -5.5Å, with a prominent red peak shifted by 550 km/s. Weaker Hβ emission is also seen, again with a P Cyg-like profile in the first spectrum, but with a more double peaked structure in the second, where the blue and red peaks are separated by 1650 km/s. The spectrum is clearly consistent with that expected for a Low Mass X-ray Binary transient system and appears to exhibit variability over short timescales, deserving of more intensive followup observations.
|
2021-05-04 02:42:00
|
optical,x-ray,binary,transient
|
2021-05-04
|
02:42:00
| 1,026 |
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] | 14,595 |
14,598 |
MAXI J1810-298 detected by INTEGRAL at hard X-rays
|
V. Sguera (INAF-OAS Bologna, Italy), L. Sidoli (INAF-IASF Milano, Italy)
|
MAXI J1803-298 is a new X-ray transient discovered on 1 May 2021 (ATel #14587). Rapid follow-up observations (at X-rays and optical waveband) were performed to identify its nature (ATels #14588, #14591, #14594, #14597).
|
2021-05-05 02:14:00
|
optical,x-ray,transient
|
2021-05-05
|
02:14:00
| 219 |
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] | 14,596 |
14,599 |
Chandra detection of a fast X-ray transient
|
Dacheng Lin (Northeastern University), Jimmy A. Irwin (University of Alabama), Edo Berger (CfA)
|
We report Chandra serendipitous detection of a fast X-ray transient (FXT) in a calibration observation of Abell 1795 on 2021 April 23 (therefore the FXT can be named as XRT 210423). The source position is RA=13:48:56.46, Decl.=+26:39:44.3, with a 95% positional uncertainty of 1.0 arcsec. After a fast rise (within a few tens of seconds), it maintained at a plateau lasting 4.1 ks at a flux of 4e-13 erg/s/cm^2, followed by a steep decay of t^(-3.6). The FXT was not detected in previous Chandra observations around the field (totaling 2.2 Ms), with a 3\sigma$ upper limit on the long-term persistent flux of 9e-16 erg/s/cm^2. No known GRB was associated with this FXT (K. Hurley. D. Svinkin, A. Ridnaia, D. Frederiks, private communication). The closest nearby galaxy is 4 arcsec away based on the CFHT optical and UKIDSS IR images.
The properties of this FXT are thus very similar to those of CDF-S XT2, which was recently argued to be powered by a newborn magnetar in a binary neutron star merger (Xue et al. 2019, Nature, 568, 198). If it is the case, its kilonova might be still detectable in IR for at least another week.
We encourage multiwavelength follow-up (from radio to X-ray) of this special FXT to search for the kilonova, afterglow from an off-axis jet, and the host galaxy.
|
2021-05-05 03:55:00
|
radio,millimeter,infra-red,optical,x-ray,gamma ray,binary,gamma-ray burst,gravitational waves,magnetar,neutron star,star,transient,request for observations
|
2021-05-05
|
03:55:00
| 1,291 |
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-0.030277898535132408
] | 14,597 |
14,600 |
ZTF optical non-detection of Chandra Fast X-ray Transient XRT 210423
|
Igor Andreoni (Caltech), Mansi Kasliwal (Caltech), Matthew Graham (Caltech)
|
The Zwicky Transient Facility (ZTF; Bellm et al., 2019; Graham et al., 2019) observed the field where the Chandra fast transient XRT 210423 (Lin et al., ATel #14599) was found 1588 times, on 820 distinct nights, from the beginning of the survey on 2018 March 17 until 2021 May 4. We explored ZTF data at the location of XRT 210423 using the ZTF point-spread-function (PSF) forced photometry service (Masci et al., 2018). No source was detected in individual images and no significant detection was found by binning nightly data in each g-r-i band. On 2021 April 23, which is the date of the Chandra discovery of XRT 210423, ZTF observations of the field were not performed. A total of 43 images, taken between 2021 April 23 and 2021 May 4, were successfully processed (19 in g-band, 20 in r-band, 4 in i-band). The table below presents the closest upper limits (5 sigma) available, in each band, before and after 2021 April 23. These upper limits were computed via nightly binning of the flux measured in individual images, processed through the ZTF reduction and image subtraction pipelines at IPAC (Masci et al., 2019). --------------------------------- Date (UT) | filter | UL (mag AB) --------------------------------- 2021-04-20 | i | >20.8 2021-04-21 | g | >21.5 2021-04-21 | r | >21.7 2021-04-24 | g | >20.5 2021-04-24 | r | >20.9 2021-05-01 | i | >19.6 --------------------------------- The coordinates of XRT 210423 reported by Lin et al. (ATel #14599) are accurate within 1.0'', which is comparable with the ZTF pixel scale. Therefore it is possible that the result of the PSF forced photometry is affected by the imprecise position of the centroid. To minimize the risk of missing a possible optical source, we visually inspected the difference images acquired after April 23 2021. We did not identify any likely point source within 3'' from the nominal coordinates in individual images, images nightly stacks, and stacks of all the images available. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-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, the Weizmann Institute for Science, the Oskar Klein Center at Stockholm University, the University of Maryland, Deutsches Elektronen-Synchrotron and Humboldt University, the TANGO Consortium of Taiwan, the University of Wisconsin at Milwaukee, Trinity College Dublin, Lawrence Livermore National Laboratories, and IN2P3, France. Operations are conducted by COO, IPAC, and UW.
|
2021-05-05 12:14:00
|
optical,x-ray,gamma ray,gamma-ray burst,transient
|
2021-05-05
|
12:14:00
| 2,637 |
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] | 14,598 |
14,601 |
INTEGRAL/JEM-X detection of MAXI J1803-298
|
Jerome Chenevez, Amanda Schriver Maartensson, Caecilie Lundahl Andersen, Gaurava K. Jaisawal (DTU Space, Denmark) on behalf of a larger collaboration
|
The new X-ray transient MAXI J1803-298 (see, e.g., ATels #14587, #14588, #14591, #14598) was serendipitously observed by INTEGRAL during the planned observation of the Galactic Center (PI: J. Wilms) between 2021-05-02T21:40 and 2021-05-04T04:15 (revolution 2361).
The source entered the JEM-X field of view during four science windows between UTC 08:19 and 10:41 on May 3, 2021 leading to 5 ksec total effective exposure. It is well detected (39 σ) between 3 and 25 keV with following average fluxes: 3-10 keV: 128 +/-5 mCrab (3.1e-9 erg/cm2/s) 10-25 keV: 132 +/-14 mCrab (1.5e-9 erg/cm2/s)
The JEM-X light curve does not reveal any flaring activity.
|
2021-05-05 15:24:00
|
x-ray,transient
|
2021-05-05
|
15:24:00
| 652 |
[
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