{
  "bibcode": "2022GCN.32837....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 221022B which was \nalso detected by Fermi GBM (GCN 32820), AGILE (Casentini et al., GCN \n32822) and Swift/BAT-GUANO (Gayathri et al., GCN 32823).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2022-10-22 22:56:11.50 UTC. The measured peak count \nrate associated with the burst is 1613 (+72, -78) counts/s above the \nbackground in the combined data of all quadrants, with a total of 14862 \n(+774, -850) counts. The local mean background count rate was 494 (+2, \n-3) counts/s. Using cumulative rates, we measure a T90 of 31 (+5, -4) 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 2022-10-22 \n22:56:10.86 UTC. The measured peak count rate is 2187 (+97, -105) \ncounts/s above the background in the combined Veto data of all \nquadrants, with a total of 18217 (+1046, -1027) counts. The local mean \nbackground count rate was 1575 (+3, -4) counts/s. We measure a T90 of 27 \n(+4, -6) 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": 32837,
  "createdOn": 1666663034000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 221022B: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 221022B"
}