{
  "bibcode": "2021GCN.30782....1P",
  "body": "V. Prasad (IUCAA), P. Sawant (IUCAA), G. Waratkar (IITB), 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 210905A, which was\nalso detected by Swift-BAT (Sonbas et al., GCN 30765) and a\nsub-threshold detection in Fermi-GBM (Veres & Roberts, GCN 30779).\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\n2021-09-05 00:12:40.5 UT. The measured peak count rate associated with\nthe burst is 87 (+37.9, -7) cts/s above the background in the combined\ndata of two quadrants (out of four), with a total of 1092 (+250, -294)\ncts. The local mean background count rate was 286.0 (+2, -2) cts/s.\nUsing cumulative rates, we measure a T90 of 24 (+11, -7) s.\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": 30782,
  "createdOn": 1631028929000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 210905A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 210905A"
}