{
  "bibcode": "2022GCN.32231....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 220619A which was \nalso detected by Fermi GBM (TrigNum: 677307509).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2022-06-19 04:58:41.500 UTC. The measured peak \ncount rate associated with the burst is 139 (+37, -18) counts/s above \nthe background in the combined data of three (out of four) quadrants, \nwith a total of 2456 (+577, -573) counts. The local mean background \ncount rate was 320 (+2, -3) counts/s. Using cumulative rates, we measure \na T90 of 47 (+20, -15) 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 2022-06-19 \n04:58:42.035 UTC. The measured peak count rate is 333 (+70, -39) \ncounts/s above the background in the combined Veto data of all \nquadrants, with a total of 6930 (+826, -1099) counts. The local mean \nbackground count rate was 1405 (+3, -3) counts/s. We measure a T90 of 55 \n(+15, -18) 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": 32231,
  "createdOn": 1655701165000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220619A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220619A"
}