{
  "bibcode": "2023GCN.33141....1N",
  "body": "P. K. Navaneeth (IUCAA), R. Gopalakrishnan (IUCAA), G. Waratkar (IITB), \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 230101A which was \nalso detected by Fermi GBM (GCN Circ. 33130).\n\nThe source was clearly detected in the 20-200 keV energy range. The \nlight curve showed multiple peaks of emission with the strongest peak at \n2023-01-01 02:16:48.5 UTC. The measured peak count rate associated with \nthe burst is 183 (+18, -16) counts/s above the background in the \ncombined data of all quadrants, with a total of 4974 (+674, -726) \ncounts. The local mean background count rate was 435 (+1, -1) counts/s. \nUsing cumulative rates, we measure a T90 of 81 (+12, -27) 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 2023-01-01 \n02:16:42.7 UTC. The measured peak count rate is 830 (+65, -61) counts/s \nabove the background in the combined Veto data of all quadrants, with a \ntotal of 14726 (+2045, -2365) counts. The local mean background count \nrate was 7515 (+5, -5) counts/s. We measure a T90 of 27 (+17, -8) s from \nthe 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": 33141,
  "createdOn": 1672743374000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 230101A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 230101A"
}