GRB 200909A
GCN Circular 28401
Subject
GRB 200909A: Fermi GBM Final Real-time Localization
Date
2020-09-09T04:11:29Z (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 04:01:22 UT on 9 Sep 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200909A (trigger 621316887.38726 / 200909168).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 338.9, Dec = -16.3 (J2000 degrees, equivalent to J2000 22h 35m, -16d 18'), with a statistical uncertainty of 5.2 degrees.
The angle from the Fermi LAT boresight is 104.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200909168/quicklook/glg_skymap_all_bn200909168.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/bn200909168/quicklook/glg_healpix_all_bn200909168.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200909168/quicklook/glg_lc_medres34_bn200909168.gif
GCN Circular 28402
Subject
GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168)
Date
2020-09-09T04:21:57Z (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
621316887 at 04:01:22 on 09 Sept. 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) = 342.2+/-2.1 deg
Decl.(2000.0) = -17.8+/-2.6 deg
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB200909168/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB200909168/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB200909168/json
GCN Circular 28403
Subject
Fermi GRB 200909A: Global MASTER-Net observations report
Date
2020-09-09T05:19:40Z (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),
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 200909A ( Fermi GBM team, GCN 28401) errorbox 43 sec after notice time and 54 sec after trigger time at 2020-09-09 04:02:16 UT, with upper limit up to 15.4 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -10.0 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 200909A errorbox 78 sec after notice time and 89 sec after trigger time at 2020-09-09 04:02:51 UT, with upper limit up to 17.2 mag. The observations began at zenith distance = 11 deg. The sun altitude is -63.4 deg.
The galactic latitude b = -57 deg., longitude l = 46 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=1436974
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
59 | 2020-09-09 04:02:16 | MASTER-SAAO | (22h 42m 59.37s , -19d 50m 01.9s) | C | 10 | 15.1 |
94 | 2020-09-09 04:02:45 | MASTER-SAAO | (22h 42m 55.65s , -19d 48m 15.1s) | C | 20 | 15.4 |
99 | 2020-09-09 04:02:51 | MASTER-OAFA | (22h 39m 23.38s , -20d 28m 57.0s) | C | 20 | 13.1 |
143 | 2020-09-09 04:03:30 | MASTER-SAAO | (22h 42m 55.72s , -19d 49m 40.7s) | C | 30 | 14.6 |
139 | 2020-09-09 04:03:31 | MASTER-OAFA | (22h 39m 22.97s , -20d 27m 57.2s) | C | 20 | 12.1 |
183 | 2020-09-09 04:04:10 | MASTER-OAFA | (22h 39m 28.01s , -20d 28m 57.3s) | C | 30 | 13.2 |
193 | 2020-09-09 04:04:20 | MASTER-SAAO | (22h 42m 58.41s , -19d 48m 30.9s) | C | 30 | 15.2 |
238 | 2020-09-09 04:05:00 | MASTER-OAFA | (22h 39m 21.89s , -20d 29m 57.9s) | C | 40 | 13.7 |
302 | 2020-09-09 04:05:59 | MASTER-OAFA | (22h 39m 28.76s , -20d 29m 34.4s) | C | 50 | 14.5 |
382 | 2020-09-09 04:07:08 | MASTER-OAFA | (22h 39m 25.88s , -20d 28m 22.2s) | C | 70 | 15.0 |
466 | 2020-09-09 04:08:38 | MASTER-OAFA | (22h 36m 37.57s , -20d 46m 37.4s) | C | 60 | 15.6 |
545 | 2020-09-09 04:09:57 | MASTER-OAFA | (22h 37m 07.72s , -18d 46m 33.2s) | C | 60 | 16.0 |
655 | 2020-09-09 04:11:17 | MASTER-OAFA | (22h 34m 10.35s , -17d 03m 07.9s) | C | 120 | 16.6 |
809 | 2020-09-09 04:13:36 | MASTER-OAFA | (22h 34m 04.21s , -17d 04m 09.3s) | C | 150 | 16.6 |
994 | 2020-09-09 04:16:26 | MASTER-OAFA | (22h 34m 09.95s , -17d 04m 09.0s) | C | 180 | 17.2 |
1193 | 2020-09-09 04:19:45 | MASTER-OAFA | (22h 34m 07.04s , -17d 02m 18.3s) | C | 180 | 16.5 |
1592 | 2020-09-09 04:26:24 | MASTER-OAFA | (22h 47m 32.69s , -18d 34m 44.7s) | C | 180 | 17.0 |
1792 | 2020-09-09 04:29:44 | MASTER-OAFA | (22h 47m 25.82s , -18d 35m 41.9s) | C | 180 | 16.4 |
1991 | 2020-09-09 04:33:03 | MASTER-OAFA | (22h 47m 26.51s , -18d 34m 43.0s) | C | 180 | 15.0 |
2191 | 2020-09-09 04:36:23 | MASTER-OAFA | (22h 47m 32.60s , -18d 35m 44.5s) | C | 180 | 16.0 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 28405
Subject
GRB 200909A: AstroSat CZTI detection
Date
2020-09-09T14:31:28Z (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 200909A, which was also detected by Fermi GBM (GCN #28401), BALROG (Biltzinger B. et al., GCN #28402) and Global MASTER-Net (Lipunov V. et al., GCN #28403).
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 2020-09-09 04:01:27.86 UT. The measured peak count rate associated with the burst is 264 +/- 22 cts/s above the background in the combined data of four quadrants, with a total of 1437 +/- 20 cts. The local mean background count rate was 424 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 21.68 +/- 0.02 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 2020-09-09 04:01:21.254 UT. The measured peak count rate is 354 +/- 45 cts/s above the background in the combined Veto data of four quadrants, with a total of 1126 +/- 32 cts. The local mean background count rate was 1744 +/- 1 cts/s. We measure a T90 of 21.12 +/- 0.01 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.