{
  "bibcode": "2022GCN.32364....1S",
  "body": "A. Suresh (IITB), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao \n(IITB), D. Bhattacharya (Ashoka University/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., \n2021, JApA, 42, 73) showed the detection of a long GRB 220707A. It was \nalso reported by INTEGRAL (Notice 9976,0).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2022-07-07 20:37:31.0 UTC. The measured peak count \nrate associated with the burst is 73 (+10 -9) counts/s above the \nbackground in the combined data of three quadrants, with a total of 3687 \n(+409 -429) counts. The local mean background count rate was 332 (+1 -1) \ncounts/s. Using cumulative rates, we measure a T90 of 75 (+11 -11) 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 2022-07-07 20:37:29.6 UTC. The \nmeasured peak count rate is 380 (+82 -10) counts/s above the background \nin the combined Veto data of all quadrants, with a total of 15340 (+1048 \n-1023)  counts. The local mean background count rate was 1343 (+3 -4) \ncounts/s. We measure a T90 of 81 (+7 -6) s from the cumulative Veto \nlight 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": 32364,
  "createdOn": 1657553671000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220707A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220707A"
}