GCN Circular 25541

R. Gaikwad, M. Chavan, V. Sharma and 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 GRB 190823A, which was also detected by Swift-XRT (E. Ambrosi et al., GCN #25476) and Tiled Swift observations (Evans P. A. et al., GCN #25459).

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 2019-08-23 13:30:05.0 UT. The measured peak count rate associated with the burst is 287 cts/s above the background in the combined data of four quadrants, with a total of 1445 cts. The local mean background count rate was 460 cts/s. Using cumulative rates, we measure a T90 of 7.3 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.