{
  "bibcode": "2021GCN.29818....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 CZTI\ncollaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al, 2020,\narxiv:2011.07067) showed detection of a long GRB 210411B, which was also\ndetected by Fermi-GBM (GCN #29792).\n\nThe source was clearly detected in the 20-200 keV energy range. The light\ncurve showed multiple peaks of emission with the strongest peak at\n2021-04-11 13:32:55.50 UT. Quadrant D was noisy, and we exclude it from\nfurther analysis. The measured peak count rate associated with the burst is\n117 (+47, -13) cts/s above the background in the combined data of four\nquadrants, with a total of 1409 (+320, -296) cts. The local mean background\ncount rate was 492 (+2, -2) cts/s. Using cumulative rates, we measure a T90\nof 27 (+4, -5) s.\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 and\nPRL. The Indian Space Research Organisation funded, managed and facilitated\nthe project.",
  "circularId": 29818,
  "createdOn": 1618498018000,
  "email": "gauravwaratkar24@gmail.com",
  "subject": "GRB 210411B: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT Bombay  <gauravwaratkar24@gmail.com>",
  "eventId": "GRB 210411B"
}