[vsnet-grb-info 23978] GRB 191026B: AstroSat CZTI detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26077
SUBJECT: GRB 191026B: AstroSat CZTI detection
DATE:    19/10/27 15:06:00 GMT
FROM:    Ramkrishna Gaikwad at IUCAA/AstroSat  <ramkrishna at iucaa.in>

R. Gaikwad, S. Gupta, 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 191026B.

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 2019-10-26 10:15:24.0 UT. The measured peak count rate associated with the burst is 1412 cts/s above the background in the combined data of four quadrants, with a total of 11228 cts. The local mean background count rate was 582 cts/s. Using cumulative rates, we measure a T90 of 21.01 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.