{
  "bibcode": "2022GCN.31788....1G",
  "body": "R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A.\nVibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (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 detection of a long GRB 220324A which was\nalso detected by Fermi - GBM (Trigger Number - 669782349).\n\nThe source was clearly detected in the 20-200 keV energy range. The\nlight curve peaks at 2022-03-24 02:39:09.50 UT. The measured peak count\nrate associated with the burst is 200 (+44, -28) counts/s above the\nbackground in the combined data of all four quadrants, with a total of\n2304 (+346, -331) counts. The local mean background count rate was 502\n(+2, -2) counts/s. Using cumulative rates, we measure a T90 of 22 (+5,\n-4) s.\n\nIt was also clearly detected in the CsI anticoincidence (Veto) detector\nin the 100-500 keV energy range. The light curve showed a single peak of\nemission at 2022-03-24 02:38:00.95 UT. The measured peak count rate is\n169 (+83, -10) counts/s  above the background in the combined Veto data\nof four quadrants, with a total of 1428 (+566, -627) counts. The local\nmean background count rate was 1687 (+5, -6) counts/s. We measure a T90\nof 18 (+5, -9) 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 [1]. CZTI is built by a TIFR-led\nconsortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,\nand PRL. The Indian Space Research Organisation funded, managed, and\nfacilitated the project. \n\nLinks:\n------\n[1] http://astrosat.iucaa.in/czti/?q=grb",
  "circularId": 31788,
  "createdOn": 1648230452000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220324A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220324A"
}