{
  "bibcode": "2022GCN.32549....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 a weak detection of a long GRB 220912A which \nwas also detected by Fermi GBM (GCN 32546).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2022-09-12 00:50:39.3 UTC. The measured peak count \nrate associated with the burst is 294 (+173, -15) counts/s above the \nbackground in the combined data of all quadrants, with a total of 1224 \n(+364, -386) counts. The local mean background count rate was 444 (+3, \n-4) counts/s. Using cumulative rates, we measure a T90 of 26 (+7, -7) s.\n\nIt was also detected in the CsI anticoincidence (Veto) detector in the \n100-500 keV energy range. The light curve peaks at 2022-09-12 00:50:25.0 \nUTC. The measured peak count rate is 188 (+76, -25) counts/s above the \nbackground in the combined Veto data of all quadrants, with a total of \n1476 (+545, -575) counts. The local mean background count rate was 1458 \n(+3, -4) counts/s. We measure a T90 of 24 (+14, -12) s from the \ncumulative 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": 32549,
  "createdOn": 1663005984000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220912A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220912A"
}