{
  "bibcode": "2022GCN.32613....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 long GRB 220930A which was \nalso detected by Swift-BAT (Cenko et at., GCN 32603), Swift-XRT (Evans \net al., GCN 32608), and Swift/UVOT (Belles et al., GCN 32609).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2022-09-30 11:11:52.50 UTC. The measured peak count \nrate associated with the burst is 435 (+49, -54) counts/s above the \nbackground in the combined data of all quadrants, with a total of 1508 \n(+301, -353) counts. The local mean background count rate was 501 (+3, \n-3) counts/s. Using cumulative rates, we measure a T90 of 9 (+8, -5) 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 2022-09-30 \n11:11:51.80 UTC. The measured peak count rate is 911 (+80, -88) counts/s \nabove the background in the combined Veto data of all quadrants, with a \ntotal of 3694 (+515, -521) counts. The local mean background count rate \nwas 1597 (+6, -7) counts/s. We measure a T90 of 13 (+5, -5) 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": 32613,
  "createdOn": 1664688421000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220930A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220930A"
}