GRB 200801B
GCN Circular 28197
Subject
GRB 200801B: AstroSat CZTI detection
Date
2020-08-03T04:37:13Z (5 years ago)
From
Soumya Gupta at IUCAA/ASTROSAT <soumya@iucaa>
S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed a weak detection of a long GRB 200716A, which was also detected by Fermi GBM (GCN #28184) and BALROG (Biltzinge B. et al., GCN #28185) and Global MASTER-Net (Lipunov V. et al., GCN #28195).
The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-08-01 15:35:48.939 UT. The measured peak count rate associated with the burst is 112 +/- 16 cts/s above the background in the combined data of four quadrants, with a total of 697 +/- 48 cts. The local mean background count rate was 420 +/- 2 cts/s. Using cumulative rates, we measure a T90 of 17.08 +/- 0.47 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-08-01 15:35:45.558 UT. The measured peak count rate is 327 +/- 37 cts/s above the background in the combined Veto data of four quadrants, with a total of 1598 +/- 87 cts. The local mean background count rate was 1709 +/- 4 cts/s. We measure a T90 of 16.17 +/- 0.26 s from the cumulative Veto light curve.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular 28195
Subject
Fermi GRB 200801B: Global MASTER-Net observations report
Date
2020-08-03T01:30:11Z (5 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, D. Cheryasov
(Lomonosov Moscow State University, SAI, Physics Department),
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),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko
(Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 200801B ( Fermi GBM team, GCN 28184) errorbox 1 days 31237 sec after notice time and 1 days 31265 sec after trigger time at 2020-08-03 00:16:52 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 74 deg. The sun altitude is -64.7 deg.
The galactic latitude b = -40 deg., longitude l = 235 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1412095
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
117695 | 2020-08-03 00:16:52 | MASTER-SAAO | (04h 34m 14.12s , -34d 00m 12.6s) | C | 60 | 17.2 |
117775 | 2020-08-03 00:18:11 | MASTER-SAAO | (04h 40m 57.39s , -36d 00m 44.9s) | C | 60 | 17.4 |
117855 | 2020-08-03 00:19:31 | MASTER-SAAO | (04h 27m 58.81s , -31d 59m 52.9s) | C | 60 | 16.7 |
118436 | 2020-08-03 00:29:13 | MASTER-SAAO | (04h 34m 12.90s , -34d 00m 26.1s) | C | 60 | 17.4 |
118516 | 2020-08-03 00:30:32 | MASTER-SAAO | (04h 41m 02.38s , -36d 01m 46.2s) | C | 60 | 17.6 |
118596 | 2020-08-03 00:31:52 | MASTER-SAAO | (04h 28m 06.15s , -32d 00m 17.9s) | C | 60 | 17.0 |
118755 | 2020-08-03 00:34:32 | MASTER-SAAO | (04h 38m 34.73s , -32d 00m 30.4s) | C | 60 | 17.0 |
118755 | 2020-08-03 00:34:32 | MASTER-SAAO | (04h 46m 51.81s , -31d 59m 19.5s) | C | 60 | 16.7 |
118835 | 2020-08-03 00:35:52 | MASTER-SAAO | (04h 45m 06.92s , -34d 01m 26.8s) | C | 60 | 17.6 |
118835 | 2020-08-03 00:35:52 | MASTER-SAAO | (04h 53m 35.54s , -34d 00m 14.9s) | C | 60 | 17.3 |
118915 | 2020-08-03 00:37:11 | MASTER-SAAO | (04h 40m 53.02s , -30d 01m 20.5s) | C | 60 | 16.9 |
119074 | 2020-08-03 00:39:51 | MASTER-SAAO | (04h 38m 38.04s , -32d 00m 48.7s) | C | 60 | 17.3 |
119074 | 2020-08-03 00:39:51 | MASTER-SAAO | (04h 46m 55.19s , -31d 59m 37.1s) | C | 60 | 16.9 |
119154 | 2020-08-03 00:41:10 | MASTER-SAAO | (04h 45m 03.41s , -34d 01m 59.9s) | C | 60 | 17.8 |
119154 | 2020-08-03 00:41:10 | MASTER-SAAO | (04h 53m 32.11s , -34d 00m 47.6s) | C | 60 | 17.5 |
119234 | 2020-08-03 00:42:30 | MASTER-SAAO | (04h 40m 59.17s , -29d 59m 21.2s) | C | 60 | 17.0 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 28185
Subject
GRB 200801B: BALROG localization (Fermi Trigger 617988951 / GRB 200801650)
Date
2020-08-01T16:03:02Z (5 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
617988951 at 15:35:46 on 01 Aug. 2020 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 78.8+/-2.8 deg
Decl.(2000.0) = -28.7+/-1.6 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB200801650/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB200801650/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB200801650/json
GCN Circular 28184
Subject
GRB 200801B: Fermi GBM Final Real-time Localization
Date
2020-08-01T15:46:11Z (5 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 15:35:46 UT on 1 Aug 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200801B (trigger 617988951.753576 / 200801650).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 70.5, Dec = -33.1 (J2000 degrees, equivalent to J2000 04h 42m, -33d 06'), with a statistical uncertainty of 1.3 degrees.
The angle from the Fermi LAT boresight is 38.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200801650/quicklook/glg_skymap_all_bn200801650.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/bn200801650/quicklook/glg_healpix_all_bn200801650.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200801650/quicklook/glg_lc_medres34_bn200801650.gif