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GCN Circular 24297

Subject
GRB 190419A: AstroSat CZTI detection
Date
2019-04-27T19:16:28Z (5 years ago)
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 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.
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