[vsnet-grb-info 24277] GRB191105B: AstroSat CZTI detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26376
SUBJECT: GRB191105B: AstroSat CZTI detection
DATE:    19/12/07 06:51:58 GMT
FROM:    Varun Bhalerao at Indian Inst of Tech  <varunb at iitb.ac.in>

V. Shenoy (IITB), Y. Sharma (Caltech), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao (TIFR), S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:

Analysis of AstroSat CZTI data showed the detection of a long GRB 191105B.

The source was detected in the 40-200 keV energy range. The light curve showed multiple pulses of emission with the strongest peak at 2019-11-05 06:16:40 UT. The measured peak count rate associated with the burst is 497 cts/s above the background in the combined data of four quadrants, with a total of 3491 cts. The local mean background count rate was 755 cts/s. Using cumulative rates, we measure a T90 of 19.0 s.

It was also 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.