GRB 200325B
GCN Circular 27481
Subject
GRB 200325B: Mondy continued observations
Date
2020-04-03T08:42:32Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich
(ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We continued observations of the MASTER OT J111012.51+274912.8
(Lipunov et al., GCN 27446) which is now is confirmed afterglow
(Pozanenko et al., GCN 27452; Strausbaugh et al., GCN 27456; Klose et
al., GCN 27464; D'Ai et al., GCN 27471) of the Fermi GRB 200325B
(Fermi GBM team, GCN 27441) with AZT-33IK 1.5-m telescope of Sayan
observatory (Mondy).
Preliminary photometry of the OT is following.
Date UT start t-T0 Filter Exp. OT Err UL(3sigma)
(mid, days) (s)
2020-03-30 15:07:22 5.03063 R 30*120 22.40 0.20 22.7
2020-03-31 17:09:44 6.11561 R 30*120 22.45 0.17 22.8
2020-04-01 16:40:59 7.10254 R 40*120 n/d n/d 22.6
the photometry is based on nearby SDSS-DR12 stars
RA DEC R(Lupton transformations)
167.569191 27.848262 16.015
167.513655 27.832992 16.930
167.510507 27.850424 15.261
A light curve of the GRB 200325B afterglow based on our observations
(Belkin et al., GCNs 27455, 27465, 27467, 27468) can be found at
http://grb.rssi.ru/GRB200325B/GRB200325B_lc.png
GCN Circular 27473
Subject
GRB 200325B: Optical upper limit
Date
2020-04-02T10:08:41Z (6 years ago)
From
Amit Kumar at ARIES, India <amitkundu515@gmail.com>
TITLE: GCN CIRCULAR
NUMBER: 27472
SUBJECT: GRB 200325B: Optical upper limit
DATE: 20/04/02 9:44:53 GMT
FROM: Amit Kumar at ARIES, India <amitkundu515@gmail.com,amit@aries.res.in>
A. Kumar (ARIES), A. Aryan (ARIES), S. B. Pandey (ARIES), R. Gupta
(ARIES), A. Ghosh
(ARIES), Dimple (ARIES), and K. Misra (ARIES) report:
We observed the optical afterglow field of the Fermi GRB 200325B
(Fermi GBM team, GCN 27441, Lipunov et al., GCN 27446)
with 1.3m Devsthal Fast Optical Telescope (DFOT) at Aryabhatta
Research Institute of Observational Sciences (ARIES), Nainital
(India),
from 2020-03-30 UT 19:37:08 to 2020-03-30 UT 20:59:28. We observed 16
frames each of 300 seconds in Bessell I filter.
No new optical source was detected within the Swift XRT enhanced error
circle in any individual as well as stacked frame.
The 3-sigma upper limit is as follows:
T_start-T0 (days) Start Date (UTC) End Date (UTC)
Filter 3-sigma upper limit (mag)
---------------------------------------------------------------------------------------------------------------
5.21 2020-03-30 19:37:08 2020-03-30 20:59:28
I >23.2
Photometry is done based on the standard star PB 2256 and USNO-B1.0
catalog. The quoted magnitude is not corrected for Galactic
extinction.
GCN Circular 27471
Subject
GRB 200325B: further Swift-XRT observations
Date
2020-04-01T14:42:38Z (6 years ago)
From
Paolo D'Avanzo at INAF - OAB <paolo.davanzo@inaf.it>
A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU),
D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), T.
Sbarrato (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of
the Swift-XRT team:
Swift-XRT has performed further follow-up observations of the
GBM-detected burst GRB 200325B (Fermi GBM team, GCN Cir. 27441),
collecting overall 4.6 ks of Photon Counting (PC) mode data between
T0+102.4 ks and T0+505.5 ks.
The uncatalogued X-ray source (Source 1) reported in D'Avanzo et al.
(GCN Circ. 27457) has faded with alpha >1.2, confirming that this is
the GRB afterglow.
The results of the XRT-team automatic analysis of the afterglow are at
https://www.swift.ac.uk/ToO_GRBs/00020978/Source1.php.
The results of the full analysis of the XRT observations are available
at https://www.swift.ac.uk/ToO_GRBs/00020978.
This circular is an official product of the Swift-XRT team.
GCN Circular 27468
Subject
GRB 200325B: Mondy continued observations
Date
2020-03-30T16:43:10Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich
(ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN
27446) afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441)
with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on
2020-03-29 (UT) 13:47:58.
Preliminary photometry of the OT is following.
Date UT start t-T0 Filter Exp. OT Err UL(3sigma)
(mid, days) (s)
2020-03-29 13:47:58 3.96785 R 19*120 22.30 0.25 22.4
the photometry is based on nearby SDSS-DR12 stars
RA DEC R(Lupton transformations)
167.569191 27.848262 16.015
167.513655 27.832992 16.930
167.510507 27.850424 15.261
GCN Circular 27467
Subject
GRB 200325B: Mondy continued observations
Date
2020-03-29T12:18:52Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich
(ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN
27446) afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441)
with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on
2020-03-28 (UT) 14:50:17.
Preliminary photometry of the OT is following.
Date UT start t-T0 Filter Exp. OT Err UL(3sigma)
(mid, days) (s)
2020-03-28 14:50:17 3.01182 R 20*120 21.82 0.13 23.4
the photometry is based on nearby SDSS-DR12 stars
RA DEC R(Lupton transformations)
167.569191 27.848262 16.015
167.513655 27.832992 16.930
167.510507 27.850424 15.261
GCN Circular 27465
Subject
GRB 200325B: Mondy continued observations
Date
2020-03-28T21:26:56Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich
(ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN
27446) afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441)
with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on
2020-03-27 (UT) 14:07:34.
Preliminary photometry of the OT is following.
Date UT start t-T0 Filter Exp. OT Err UL(3sigma)
(mid, days) (s)
2020-03-27 14:07:34 1.9877 R 28*120 21.15 0.06 23.1
the photometry is based on nearby SDSS-DR12 stars
RA DEC R(Lupton transformations)
167.569191 27.848262 16.015
167.513655 27.832992 16.930
167.510507 27.850424 15.261
The photometry presented above corroborates the photometry presented by
LCO (Strausbaugh et al. GCN 27456) at about the same time.
GCN Circular 27464
Subject
GRB 200325B: Tautenburg observations
Date
2020-03-28T20:01:16Z (6 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
S. Klose, B. Stecklum, A. Nicuesa Guelbenzu, S. Melnikov, and F. Ludwig
(all Tautenburg) report:
We observed the field of GRB 200325B (Ferni GBM team, GCN 27441) with the
Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k CCD
camera and the wide V-band filter (VB). The transmission curve of this
filter closely follows the Gaia GBP filter. Observations were performed
during several epochs starting 1.2 days after the burst.
The optical transient discovered by the MASTER Global Robotic Net (Lipunov
et al., GCN 27446) is clearly detected (see also Pozanenko et al., GCN
27452; Belkin et al., GCN 27455; Strausbaugh et al., GCN 27456; D'Avanzo
et al., GCN 27457). Aperture photometry was performed using several Gaia
DR2 stars in the field. Between dt = 1.2 and 2.4 days the optical
transient was fading by 1.3 mag. During our last observation (2.4 days
post burst) it had reached VB = 20.7 +/- 0.2 mag.
GCN Circular 27460
Subject
GRB 200325B: Fermi GBM observation
Date
2020-03-28T00:39:30Z (6 years ago)
From
Christian Malacaria at NASA-MSFC/USRA <cmalacaria@usra.edu>
C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 14:53:16.04 UT on 25 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 200325B (trigger 606840801 / 200325620),
which was also detected by the Swift/XRT (GCN 27457).
The optical counterpart was detected by MASTER (GCN 27446), Mondy (GCN 27452),
and LCO (GCN 27457).
The angle from the Fermi LAT boresight at the GBM trigger time is 102.5 degrees.
The GBM light curve shows a broad peak with several spikes overimposed,
with a duration (T90) of about 36.6 s (50-300 keV).
The time-averaged spectrum from T0-8.1 s to T0+36.9 s is
best fit by a power law function with an exponential
high-energy cutoff. The power law index is -1.33 +/- 0.04 and
the cutoff energy, parameterized as Epeak, is 150.1 +/- 12.8 keV.
The event fluence (10-1000 keV) in this time interval is
(1.12 +/- 0.04)e-5 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+10.7 s in the 10-1000 keV band
is 9.1 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular 27457
Subject
GRB 200325B: Swift-XRT and UVOT observations
Date
2020-03-27T17:35:01Z (6 years ago)
From
Paolo D'Avanzo at INAF-OAB <pda.davanzo@gmail.com>
P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), A. Melandri (INAF-OAB),
T. Sbarrato (INAF-OAB), S. R. Oates (U. of Birmingham), M. H. Siegel (PSU),
F. E. Marshall (NASA/GSFC), S. Dichiara (NASA/GSFC/UMCP) and P.A. Evans
(U.Leicester) report on behalf of the Swift-XRT and UVOT teams:
Swift-XRT has performed follow-up observations of the Fermi-detected
burst GRB 200325B (Fermi GBM team, GCN Cir. 27441), collecting 1.1
ks of Photon Counting (PC) mode data between T0+102.4 ks and T0+124.8 ks
in a single pointing covering the region of the candidate GRB optical
counterpart initially reported by Lipunov et al. (GCN Circ. 27446).
An uncatalogued X-ray source has been detected:
Source 1:
RA (J2000.0): 167.55381 = 11:10:12.91
Dec (J2000.0): +27.8196 = +27:49:10.5
Error: 4.9 arcsec (radius, 90% conf. [Enhanced position])
Count-rate: 0.020 [+/-0.005] ct s^-1
Flux: (7.2 [+/-1.8])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)
The source is below the RASS limit and, due to the limited amount of
data available so far, shows no signs of fading.
The position of this source is consistent with the one reported for the
GRB optical afterglow (Lipunov et al., GCN Circ. 27446; Pozanenko et al.,
GCN Circ. 27452; Belkin et al., GCN Circ. 27455; Strausbaugh & Cucchiara,
GCN Circ. 27456). We therefore conclude that this is the X-ray afterglow of
GRB 200325B.
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00020978 <https://www.swift.ac.uk/ToO_GRBs/00020978>.
The Swift/UVOT began settled observations of the field of GRB 200325B
102ks after the Fermi/GBM trigger. An optical source consistent with the
GRB optical afterglow (Lipunov et al., GCN Circ. 27446; Pozanenko et al.,
GCN Circ. 27452; Belkin et al., GCN Circ. 27455; Strausbaugh & Cucchiara,
GCN Circ. 27456) is detected in the initial UVOT white exposure.
A preliminary magnitude in white using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) is:
Filter T_start(ks) T_stop(ks) Exp(s) Mag
white 102.39 124.75 1044 21.27 �� 0.24
This magnitude is not corrected for the Galactic extinction due to the reddening
of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular 27456
Subject
GRB 200325B: LCO Optical Detection
Date
2020-03-27T15:26:37Z (6 years ago)
From
Robert Strausbaugh at U. of the Virgin Islands <robert.strausbaugh@uvi.edu>
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed Fermi GRB 200325A (Fermi GBM Team, GCN 27441) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on March 27, from 12:08 to 12:48 UT (corresponding to 45.25 to 45.92 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x240s exposures in R and I. We detect a source consistent with other optical detections (Lipunov et al., GCN 27446, Pozanenko et al., GCN 27452) in stacked images. Using the USNO-B.1 catalog as reference, we obtain the following magnitudes:
R = 21.36 +/- 0.11
I = 20.52 +/- 0.13
These magnitudes are not corrected for Galactic Extinction.
R.S. is funded by NSF AST grant #1831682
GCN Circular 27455
Subject
GRB 200325B: Mondy, CrAO, AbAO afterglow confirmation and refined photometry of MASTER OT J111012.51+274912.8
Date
2020-03-27T13:14:36Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Sosnovskij
(CrAO), R. Ya. Inasaridze (AbAO), V. Rumyantsev (CrAO), M. Eselevich
(ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN
27446) as a candidate in afterglow of the Fermi GRB 200325B (Fermi GBM
team, GCN 27441) with AZT-33VM 1.5-m telescope of Sayan observatory
(Mondy) starting on 2020-03-26 (UT) 15:08:10, ZTSh 2.6m telescope of
CrAO starting on 2020-03-26 (UT) 20:11:20 (Pozanenko et al., GCN 27452),
and AS-32 0.7m telescope of Abastumani observatory starting on
2020-03-26 (UT) 20:27:39. Below we present refined photometry of the OT.
Preliminary photometry of the object is following.
Date UT start t-T0 Filter Exp. OT Err UL(3sigma) telescope
(mid, days) (s)
2020-03-26 15:08:10 1.0263 R 23*120 19.89 0.05 22.6 AZT-33VM
2020-03-26 20:11:20 1.2306 R 14*120 20.07 0.08 22.3 ZTSh
2020-03-26 20:27:39 1.2444 R 35*60 n/d n/d 20.0 AS-32
the photometry is based on nearby SDSS-DR12 stars
RA DEC R(Lupton transformations)
167.569191 27.848262 16.015
167.513655 27.832992 16.930
167.510507 27.850424 15.261
We note that coordinates of the OT (Lipunov et al., GCN 27446; Pozanenko
et al., GCN 27452) coincide with only one XRT source
(https://www.swift.ac.uk/ToO_GRBs/00020978/ ) found in the error
localization of GBM/Fermi. Taking into account the XRT source and fading
OT we suggest the MASTER OT J111012.51+274912.8 is an afterglow GRB
200325B.
GCN Circular 27452
Subject
GRB 200325B: Mondy and CrAO observations, Master MASTER OT J111012.51+274912.8 confirmation
Date
2020-03-26T23:30:56Z (6 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A. Pozanenko (IKI), E. Klunko (ISTP), A. Sosnovskij (CrAO), M. Eselevich
(ISTP), V. Rumyantsev (CrAO), S. Belkin (IKI), E. Mazaeva (IKI), A.
Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of Fermi-GBM GRB 200325B (Fermi GBM team, GCN
27441) with AZT-33VM 1.5-m telescope of Sayan observatory (Mondy)
starting on 2020-03-26 (UT) 15:08:10 and and ZTSh 2.6m telescope of
CrAO starting on 2020-03-26 (UT) 20:11:20. We clearly detected the OT
discovered by MASTER (Lipunov et al., GCN 27446). Coordinates of the OT
are (J2000) 11:10:12.54 +27:49:11.7 with uncertainty of 0.5 arcses. The
R magnitude of the OT is 19.8 +/- 0.15 at 2020-03-26 (UT) 15:08:10.
Observations and data reduction is ongoing.
GCN Circular 27450
Subject
GRB 200325B: Swift ToO observations
Date
2020-03-26T18:35:03Z (6 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Fermi/GBM GRB 200325B.
Automated analysis of the XRT data will be presented online at
https://www.swift.ac.uk/ToO_GRBs/00020978
Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. These are
not necessarily related to the Fermi/GBM event. Any X-ray source
considered to be a probable afterglow candidate will be reported via a
GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular 27446
Subject
GRB 200325B: MASTERt OT detection
Date
2020-03-26T12:13:10Z (6 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina,
P.Balanutsa,A.Kuznetsov,F.Balakin,
V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,
D.Kuvshinov(Lomonosov Moscow State University, SAI, Physics Department),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo
Observatory),
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),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State
University)
MASTER OT J111012.51+274912.8 discovery - new OT inside Fermi GRB 200325B
(trigger 606840801)
MASTER Global Robotic Net inspected GRB 200325B:
Fermi trigger 606840801, Ttr=2020-03-05 14:53:16 UT, GCN #27441,
MASTER report GCN #27442, MASTER map and OT position.
During inspection
MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global
Robotic Net", Advances in Astronomy, 2010, 30L )
discovered new OT source at (RA, Dec) = 11h 10m 12.51s +27d 49m 12.8s on
2020-03-25 16:21:15 UT.
The OT unfiltered magnitude is 16.1m (mlim=17.8).
The OT is seen in 2 inspect images
(MASTER has 2 tubes at each observatory and works with large error-fields
like Fermi in open mode, that gives 8 square degrees, i.e. 2x4sq.deg.).
There is no minor planet at this place and no any sources in VIZIER
database (22mag limit in POSS history).
We have reference images on 2010-03-13.87244 UT with unfiltered mlim=
20.2m, on 2020-02-21 21:54:40UT with mlim=20.3.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/111012.51274912.8.png
GCN Circular 27441
Subject
GRB 200325B: Fermi GBM Final Real-time Localization
Date
2020-03-25T15:03:33Z (6 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 14:53:16 UT on 25 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200325B (trigger 606840801.036936 / 200325620).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 166.9, Dec = 26.2 (J2000 degrees, equivalent to J2000 11h 07m, 26d 11'), with a statistical uncertainty of 3.3 degrees.
The angle from the Fermi LAT boresight is 101.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200325620/quicklook/glg_skymap_all_bn200325620.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200325620/quicklook/glg_healpix_all_bn200325620.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200325620/quicklook/glg_lc_medres34_bn200325620.gif