GRB 191009A
GCN Circular 25985
Subject
GRB 191009A: Fermi GBM Final Real-time Localization
Date
2019-10-09T07:19:20Z (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 07:08:56 UT on 9 Oct 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 191009A (trigger 592297741.769374 / 191009298).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 26.8, Dec = 65.7 (J2000 degrees, equivalent to J2000 01h 47m, 65d 42'), with a statistical uncertainty of 1.4 degrees.
The angle from the Fermi LAT boresight is 40.0 degrees.
The skymap can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191009298/quicklook/glg_skymap_all_bn191009298.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191009298/quicklook/glg_healpix_all_bn191009298.fit
The GBM light curve can be found here:
http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn191009298/quicklook/glg_lc_medres34_bn191009298.gif
GCN Circular 25986
Subject
GRB 191009A: BALROG localization (Fermi Trigger 592297741 / GRB 191009298)
Date
2019-10-09T07:38:41Z (6 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
592297741 at 07:08:56 on 09 Oct. 2019 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) = 30.0+/-5.9 deg
Decl.(2000.0) = 67.1+/-2.1 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB191009298/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB191009298/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB191009298/json
GCN Circular 25997
Subject
GRB 191009A: Insight-HXMT/HE detection
Date
2019-10-11T11:14:37Z (6 years ago)
From
QiBin Yi at IHEP, HXMT <yiqb@ihep.ac.cn>
Q. B. Yi, S. Xiao, Q. Luo, C. Cai, C. K. Li,
X. B. Li, G. Li, J. Y. Liao, S. L. Xiong,
C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu,
A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin,
Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song,
M. Wu, Y. P. Xu, S. N. Zhang (IHEP),
report on behalf of the Insight-HXMT team:
At 2019-10-09T07:08:56.77 (T0), Insight-HXMT/HE detected
GRB 191009A (trigger ID: HEB191009297) in a routine search of the data,
which was also triggered by Fermi/GBM (GCN #25985).
The Insight-HXMT/HE light curve mainly consists of a single
pulse with a duration (T90) of 17.76 s measured from T0-1.56 s.
The 1-ms peak rate, measured from T0+7.40 s, is 495 cnts/sec.
The total counts from this burst is 1769 counts.
URL_LC: http://www.hxmt.org/images/GRB/HEB191009297_lc.jpg
All measurements above are made with the CsI detectors operating in the
regular mode with the energy range of about 80-800 keV (deposited energy).
Only gamma-rays with energy greater than about 200 keV can penetrate
the spacecraft and leave signals in the CsI detectors installed inside
of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was
funded jointly by the China National Space Administration (CNSA) and
the Chinese Academy of Sciences (CAS).
More information about it could be found at:
http://www.hxmt.org.
GCN Circular 26004
Subject
GRB 191009A: AstroSat CZTI detection
Date
2019-10-12T05:31:46Z (6 years ago)
From
Ramkrishna Gaikwad at IUCAA/AstroSat <ramkrishna@iucaa.in>
R. Gaikwad, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a GRB 191009A, which was also detected by Fermi GBM Final Real-time Localization (GCN #25985), BALROG localization (Biltzinger B. et al., GCN # 25986) and Insight-HXMT/HE (Luo Q. et al., GCN # 25997).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with the strongest peak at 2019-10-09 07:08:56.0 UT. The measured peak count rate associated with the burst is 572 cts/s above the background in the combined data of four quadrants, with a total of 1682 cts. The local mean background count rate was 473 cts/s. Using cumulative rates, we measure a T90 of 22.0 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
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.