[vsnet-grb-info 21692] GRB 190122B: AstroSat CZTI detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23791
SUBJECT: GRB 190122B: AstroSat CZTI detection
DATE:    19/01/25 03:50:21 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 long GRB 190122B.

The source was clearly detected in the 20-200 keV energy range. The light curve shows strongest peak of emission at 16:57:02.5 UT. The measured peak count rate is 266 cts/s above the background in combined data of four quadrants, with a total of 801 cts. The local mean background count rate was 559 cts/s. Using cumulative rates, we measure a T90 of 4.18 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.