{
  "bibcode": "2022GCN.32541....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 a bright long GRB 220910A \nwhich was also detected by AGILE (Ursi et al., GCN 32540) and reported \nin an IPN_RAW notice (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 \n2022-09-10 05:48:29.0 UTC. The measured peak count rate associated with \nthe burst is 4111 (+341, -343) counts/s above the background in the \ncombined data of all quadrants, with a total of 5809 (+205, -203) \ncounts. The local mean background count rate was 503 (+6, -11) counts/s. \nUsing cumulative rates, we measure a T90 of 2.6 (+0.4, -0.3) 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 2022-09-10 \n05:48:27.0 UTC. The measured peak count rate is 6301 (+143, -155) \ncounts/s above the background in the combined Veto data of all \nquadrants, with a total of 14603 (+414, -431) counts. The local mean \nbackground count rate was 1477 (+7, -8) counts/s. We measure a T90 of \n3.7 (+0.5, -0.6) s from the cumulative 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": 32541,
  "createdOn": 1662838454000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220910A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220910A"
}