{
  "bibcode": "2022GCN.31440....1P",
  "body": "V. Prasad (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao\n(IITB), D. Bhattacharya (IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale\n(PRL) report on behalf of the AstroSat CZTI collaboration: \n\nAnalysis of AstroSat CZTI data, with the ML pipeline (Abraham et al.,\n2021, MNRAS, 504, 3084) and the CIFT framework (Sharma et al., 2021,\nJApA, 42, 73), showed detection of a long GRB 220111A, which was also\ndetected by Fermi-GBM (GCN 31434), with localization reported by BALROG\n(Biltzinger et al., GCN 31435). \n\nThe source was clearly detected in the 20-200 keV energy range. The\nlight curve peaks at 2022-01-11 19:21:52.75 UT. The measured peak count\nrate associated with the burst is 1028 (+208, -77) cts/s above the\nbackground in the combined data of four quadrants, with a total of 3672\n(+250, -232) cts. The local mean background count rate was 471 (+4, -7)\ncts/s. Using cumulative rates, we measure a T90 of 10 (+1, -1) 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 2022-01-11\n19:21:51.95 UT. The measured peak count rate is 509 (+72, -80) cts/s\nabove the background in the combined Veto data of four quadrants, with a\ntotal of 1900 (+429, -475) cts. The local mean background count rate was\n1580 (+5, -5) cts/s. We measure a T90 of 5 (+6, -2) 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, ISAC, IUCAA, SAC,\nand PRL. The Indian Space Research Organisation funded, managed, and\nfacilitated the project.",
  "circularId": 31440,
  "createdOn": 1641972843000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220111A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220111A"
}