Skip to main content
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 28118

Subject
GRB 200716B: AstroSat CZTI detection
Date
2020-07-16T17:49:32Z (4 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 the detection of a long GRB 200716B, which was also detected by Fermi GBM (GCN #28113) and BALROG (Biltzinge B. et al., GCN #28114).

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 2020-07-16 07:34:29.531 UT. The measured peak count rate associated with the burst is 356 +/- 27 cts/s above the background in the combined data of four quadrants, with a total of 3023 +/- 68 cts. The local mean background count rate was 572 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 29.35 +/- 0.08 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 2020-07-16 07:34:28.000 UT. The measured peak count rate is 1190 +/- 53 cts/s above the background in the combined Veto data of four quadrants, with a total of 8920 +/- 167 cts. The local mean background count rate was 1623 +/- 3 cts/s.  We measure a T90 of 28.17 +/- 0.31 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.
Looking for U.S. government information and services? Visit USA.gov