{
  "bibcode": "2023GCN.33493....1N",
  "body": "P K. Navaneeth (IUCAA), G. Waratkar (IITB), R. Gopalakrishnan (IUCAA), \nA. Vibhute (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 230321B which was \nalso detected by Fermi GBM (TrigNum: 701058254) and KONUS-Wind.\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve peaks at 2023-03-21 02:24:13.35 UTC. The measured peak count \nrate associated with the burst is 426 (+186, -1) counts/s above the \nbackground in the combined data of three quadrants (out of four), with a \ntotal of 1195 (+203, -204) counts. The local mean background count rate \nwas 361 (+6, -8) counts/s. Using cumulative rates, we measure a T90 of \n5.57 (+2, -1) s.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) \ndetector in the 100-500 keV energy range. The light curve peaks at \n2023-03-21 02:24:10.58 UTC. The measured peak count rate associated with \nthe burst is 268 (+80, -39) counts/s above the background in the \ncombined data of all quadrants, with a total of 1050 (+324, -377) \ncounts. The local mean background count rate was 1568 (+6, -6) counts/s. \nWe measure a T90 of 5.24 (+3, -2) s from the cumulative Veto light \ncurve.\n\nCZTI is built by a TIFR-led consortium of institutes across India, \nincluding VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research \nOrganisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb",
  "circularId": 33493,
  "createdOn": 1679390113000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 230321B: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 230321B"
}