[vsnet-grb-info 22274] GRB 190501BA: AstroSat CZTI detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24373
SUBJECT: GRB 190501BA: AstroSat CZTI detection
DATE:    19/05/03 06:42:08 GMT
FROM:    Prachee Ghumatkar at IUCAA/AstroSat  <prachee at iucaa.in>

P. Ghumatkar, 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 190501B.

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 02:11:50.5 UT. The measured peak count rate associated with the burst is 88 cts/s above the background in the combined data of four quadrants, with a total of 410 cts. The local mean background count rate was 408 cts/s. Using cumulative rates, we measure a T90 of  12.5s.

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.