{
  "bibcode": "2022GCN.32441....1G",
  "body": "R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A. \nVibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka \nUniversity/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report \non behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., \n2021, JApA, 42, 73) showed the detection of GRB 220803A which was also \ndetected by Fermi-GBM (TrigNum: 681212354) and was reported in an \nIPN_RAW Notice (contributed by Konus-Wind).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve showed multiple peaks of emission with the strongest peak at \n2022-08-03 09:39:10.15 UTC. The measured peak count rate associated with \nthe burst is 714 (+175, -87) counts/s above the background in the \ncombined data of three (out of four) quadrants, with a total of 935 \n(+238, -226) counts. The local mean background count rate was 349 (+5, \n-6) counts/s. Using cumulative rates, we measure a T90 of 3.9 (+4.3, \n-1.0) s.\n\nIt was also clearly detected in the CsI anticoincidence (Veto) detector \nin the 100-500 keV energy range. The light curve peaks at 2022-08-03 \n09:39:09.32 UTC. The measured peak count rate is 274 (+72, -76) counts/s \nabove the background in the combined Veto data of all quadrants, with a \ntotal of 842 (+310, -330) counts. The local mean background count rate \nwas 1691 (+8, -9) counts/s. We measure a T90 of 6 (+2, -4) s from the \ncumulative Veto light curve.\n\nCZTI GRB detections are reported regularly on the payload site at \nhttp://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led \nconsortium of institutes across India, including VSSC, URSC, IUCAA, SAC, \nand PRL. The Indian Space Research Organisation funded, managed, and \nfacilitated the project.",
  "circularId": 32441,
  "createdOn": 1659612347000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220803A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220803A"
}