{
  "subject": "GRB 230709C: AstroSat CZTI detection",
  "body": "P K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:\n\nAnalysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a short GRB 230709C which was also detected by Fermi-GBM (Trig. 710617111; Preis et al., GCN Circ. 34187).\n\nThe source was clearly detected in the 20-200 keV energy range. The light curve peaks at 2023-07-09 17:38:26.94 UTC. The measured peak count rate associated with the burst is 3742 (+1196, -481) counts/s above the background in the combined data of all quadrants, with a total of 280 (+65, -56) counts. The local mean background count rate was 337 (+34, -54) counts/s. Using cumulative rates, we measure a T90 of 0.33 (+0.30, -0.03) s. We caution that there was a 0.3 s readout dead time in CZTI before the detection of the burst. Hence, the T90 can be as large as 0.63 s for this GRB, with a lower limit of 0.30 s as estimated above by cumulative rates.\n\nThe source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.\n\nCZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.\n\nCZTI GRB detections are reported regularly on the payload site at:\nhttp://astrosat.iucaa.in/czti/?q=grb\n",
  "circularId": 34191,
  "eventId": "GRB 230709C",
  "createdOn": 1688980333602,
  "bibcode": "2023GCN.34191....1N",
  "submitter": "Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>"
}