{
  "bibcode": "2022GCN.32853....1G",
  "body": "R. Gopalakrishnan (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. \nBhalerao (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 short GRB 221025A which \nwas also detected by Fermi-GBM (Wood et al,. GCN 32851) and Fermi-LAT \n(Arimoto et al,. GCN 32843).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2022-10-25 00:58:18.6 UTC. The measured peak count \nrate associated with the burst is 904 (+212, -102) counts/s above the \nbackground in the combined data of all quadrants, with a total of 313 \n(+62, -63) counts. The local mean background count rate was 435 (+8, \n-12) counts/s. Using cumulative rates, we measure a T90 of 0.45 (+0.6, \n-0.2) s.\n\nIt was also detected in the CsI anticoincidence (Veto) detector in the \n100-500 keV energy range. Due to the intrinsic 1 s binning of veto data, \nwe cannot reliably estimate a T90 from it.\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": 32853,
  "createdOn": 1666791743000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 221025A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 221025A"
}