{
  "bibcode": "2022GCN.32316....1S",
  "body": "A. Suresh (IITB), G. Waratkar (IITB), R. Gopalakrishnan (IUCAA), V. \nPrasad (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya \n(Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) \nreport on 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 the long (or possibly \nlensed) GRB 220627A which was also detected by Fermi GBM (Fermi GBM \nteam, GCN 32278; Roberts et al., GCN 32288), Fermi-LAT (Lalla et al., \nGCN 32283), Swift-BAT-GUANO (Raman et al., GCN 32287), Konus-Wind \n(Frederiks et al., GCN 32295), and Swift-XRT (Gropp et al. GCN 32302).\n\nAstroSat CZTI was in the South Atlantic Anomaly (SAA) region during the \nfirst burst episode. About 1000s after the first burst, CZTI detected \nthe second burst episode that was also reported by Fermi-GBM (GCN \n32288), and Konus-Wind (GCN 32295). This burst was clearly detected in \nthe 20-200 keV energy range. The light curve peaks at 2022-06-27 \n21:38:49.500 UTC. The measured peak count rate associated with the burst \nis 233 (+43, -41) counts/s above the background in the combined data of \nall four quadrants, with a total of 2707 (+454, -447) counts. The local \nmean background count rate was 500 (+3, -4) counts/s. Using cumulative \nrates, we measure a T90 of 43 (+2, -12) s.\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": 32316,
  "createdOn": 1656762131000,
  "email": "gauravwaratkar@iitb.ac.in",
  "subject": "GRB 220627A: AstroSat CZTI detection",
  "submitter": "Gaurav Waratkar at IIT,Bombay  <gauravwaratkar@iitb.ac.in>",
  "eventId": "GRB 220627A"
}