TITLE:   GCN CIRCULAR
NUMBER:  24118
SUBJECT: GRB 190411A: AstroSat CZTI detection
DATE:    19/04/13 13:57:05 GMT
FROM:    Tanazza Khanam at IUCAA  <tanazza@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 190411A, which was also detected by Insight-HXMT/HE detection (Cai C. et al., GCN # 24117).

The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple pulses of emission with strongest peak at 09:45:52.5 UT. The measured peak count rate associated with the burst is 3857.37 cts/s above the background in the combined data of four quadrants, with a total of 40446 cts. The local mean background count rate was 321.6 cts/s. Using cumulative rates, we measure a T90 of 42.7 s. In preliminary analysis, we find that 3004 Compton events are associated with this event.

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.