TITLE:   GCN CIRCULAR
NUMBER:  26322
SUBJECT: GRB 191201A: AstroSat CZTI detection
DATE:    19/12/02 09:08:53 GMT
FROM:    Ramkrishna Gaikwad at IUCAA/AstroSat  <ramkrishna@iucaa.in>

R. Gaikwad, S. Gupta, V. Sharma, A. Vibhute 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 191201A.

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 2019-12-01 14:54:37.0 UT. The measured peak count rate associated with the burst is 444 cts/s above the background in the combined data of four quadrants, with a total of 5986 cts. The local mean background count rate was 645 cts/s. Using cumulative rates, we measure a T90 of 26.85 s. In preliminary analysis, we find that 491 Compton events are associated with this event.

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.