{
  "bibcode": "2020GCN.28367....1G",
  "body": "S. Gupta, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data showed the detection of a bright long GRB 200903E.\n\nThe source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-09-03 02:34:50.40 UT. The measured peak count rate associated with the burst is 1061 +/- 38 cts/s above the background in the combined data of four quadrants, with a total of 22806 +/- 104 cts. The local mean background count rate was 597 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 90.78 +/- 0.02 s. In preliminary analysis, we find that 1885 Compton events are associated with this event.\n\nIt was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-09-03 02:34:49.00 UT. The measured peak count rate is 3999 +/- 75 cts/s above the background in the combined Veto data of four quadrants, with a total of 79278 +/- 173 cts. The local mean background count rate was 1611 +/- 1 cts/s.  We measure a T90 of 90.50 +/- 0.03 s from the cumulative Veto light curve.\n\nCZTI 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.",
  "circularId": 28367,
  "createdOn": 1599283868000,
  "email": "soumya@iucaa",
  "subject": "GRB 200903E: AstroSat CZTI detection",
  "submitter": "Soumya Gupta at IUCAA/ASTROSAT  <soumya@iucaa>",
  "eventId": "GRB 200903E"
}