{
  "circularId": 44443,
  "submittedHow": "web",
  "createdOn": 1777726475130,
  "body": "A. Arya (IITB), A. Goyal (IITB), M. Tembhurnikar (IUCAA), Harsha K. H. (IUCAA), S. Salunke (IUCAA), G. Waratkar (Caltech/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 long GRB 260429B which is also detected by Konus-Wind (priv. comm), and is associated with EP260429a (Wang et al., GCN Circ. 44426). \n\nThe source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2026-04-29 14:42:59.27  UTC. The measured peak count rate associated with the burst is 147 (+31, -33) counts/s above the background in the combined data of all quadrants, with a total of 1802 (+485, -554) counts. The local mean background count rate was 1313 (+3, -3) counts/s. We measure a T90 of 34 (+6, -9) s from the cumulative Veto light curve.\n\nThe source was also faintly detected in the CZT detectors in the 20-200 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 data products like interactive and downloadable light curves for this GRB can be found at:\nhttps://astrosat.iucaa.in/cift/cift_products/515169782.27/S515169782.27_details.html\n\nCZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb",
  "subject": "GRB 260429B / EP260429a: AstroSat CZTI detection ",
  "eventId": "GRB 260429B",
  "submitter": "Anuraag Arya at IIT Bombay <aryaanuraag910@gmail.com>",
  "format": "text/plain"
}