{
  "bibcode": "2021GCN.30223....1S",
  "body": "P. Sawant (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), S. Gupta\n(IUCAA), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao\n(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat\nCZTI collaboration: \n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al,\n2020, arxiv:2011.07067) showed detection of a long GRB 210607C, which\nwas also detected by Insight-HXMT/HE (GCN #30202). \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\n2021-06-07 21:39:21.5 UT. The measured peak count rate associated with\nthe burst is 2757 (+90, -98) cts/s above the background in the combined\ndata of four quadrants, with a total of 22768 (+388, -416) cts. The\nlocal mean background count rate was 469 (+3, -3) cts/s. Using\ncumulative rates, we measure a T90 of 18 (+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 showed multiple peaks\nof emission with the strongest peak at 2021-06-07 21:39:20.1 UT. The\nmeasured peak count rate is 2596 (+99, -112) cts/s above the background\nin the combined Veto data of four quadrants, with a total of 18010\n(+525, -559) cts. The local mean background count rate was 1507 (+5, -6)\ncts/s. We measure a T90 of 14 (+1, -1) s from the cumulative Veto light\ncurve. \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": 30223,
  "createdOn": 1623506603000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 210607C: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 210607C"
}