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GCN Circular 24694

Subject
GRB 190530A: AstroSat CZTI detection
Date
2019-05-31T14:55:41Z (5 years ago)
From
Vidushi Sharma at IUCAA <vidushi@iucaa.in>
P. Ghumatkar, V. Sharma, D. Bhattacharya, T. Khanam 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 190530A, which was also detected by AGILE-MCAL (Lucarelli F. et al., GCN # 24678), Fermi-LAT (Longo F. et al., GCN # 24679), AGILE/GRID (Verrecchia F. et al., GCN # 24683), Swift-XRT (Melandri A. et al., GCN # 24689) and Fermi GBM (Bissaldi E. et al., GCN # 24692).

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 10:19:25.5 UT. The measured peak count rate associated with the burst is 2745 cts/s above the background in the combined data of four quadrants, with a total of 23800 cts. The local mean background count rate was 486 cts/s. Using cumulative rates, we measure a T90 of 23.9 s. In preliminary analysis, we find that 1931 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.
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