{
  "bibcode": "2021GCN.30889....1S",
  "body": "P. Sawant (IUCAA), G. Waratkar (IITB), V. Prasad (IUCAA), A. Vibhute\n(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 210926A, which was\nalso detected by GECAM (C. Zheng et al., GCN 30886).\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\n2021-09-26 20:52:27.5 UT. The measured peak count rate associated with\nthe burst is 250 (+51, -16) cts/s above the background in the combined\ndata of four quadrants, with a total of 3971 (+446, -463) cts. The local\nmean background count rate was 480 (+3, -3) cts/s. Using cumulative\nrates, we measure a T90 of 26 (+6, -5) s. \n\nIt was also clearly detected in the CsI anticoincidence (Veto) detector\nin the 100-500 keV energy range. The light curve showed multiple peaks\nof emission with the strongest peak at 2021-09-26 20:52:30.9 UT. The\nmeasured peak count rate is 262 (+73, -38) cts/s above the background in\nthe combined Veto data of four quadrants, with a total of 3091 (+703,\n-866 cts. The local mean background count rate was 1512 (+5, -4) cts/s.\nWe measure a T90 of 25 (+14, -10) s from the cumulative Veto light\ncurve. \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, ISAC, IUCAA, SAC,\nand PRL. The Indian Space Research Organisation funded, managed and\nfacilitated the project.",
  "circularId": 30889,
  "createdOn": 1632749769000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 210926A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 210926A"
}