[vsnet-grb-info 22198] GRB 190419A: AstroSat CZTI detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24297
SUBJECT: GRB 190419A: AstroSat CZTI detection
DATE:    19/04/27 19:16:28 GMT
FROM:    Tanazza Khanam at IUCAA  <tanazza at iucaa.in>

T. Khanam, V. Sharma, 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 190419A, which was also detected by FERMI (Kunzweiler F. et al, GCN #24132) and Global-MASTER Net (Lipunov V. et al, GCN #24135).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 09:55:42.5 UT. The measured peak count rate associated with the burst is 134.65 cts/s above the background in the combined data of four quadrants, with a total of 690 cts. The local mean background count rate was 488.3 cts/s. Using cumulative rates, we measure a T90 of 7.7 s.

It was more 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.