TITLE:   GCN CIRCULAR
NUMBER:  23901
SUBJECT: GRB 190215A: AstroSat CZTI detection
DATE:    19/02/18 21:00:01 GMT
FROM:    Vidushi Sharma at IUCAA  <vidushi@iucaa.in>

V. Sharma, T. Khanam, D. Bhattacharya and A. Vibhute (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 long GRB 190215A, which was also detected by Fermi/GBM (Mailyan B. et al., GCN # 23898) and Insight-HXMT/HE (Yi Q. B. et al., GCN # 23899).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with strongest peak at 18:31:29.5 UT, about 7 s after the Fermi/GBM trigger time. The measured peak count rate associated with the burst is 273 cts/s above the background in the combined data of four quadrants, with a total of 2683 cts. The local mean background count rate was 506 cts/s. Using cumulative rates, we measure a T90 of 23 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.