{
  "createdOn": 1793178709497,
  "submitter": "ABHINAV GOYAL at Indian Institute of Technology Bombay <abhigoyale2003@gmail.com>",
  "body": "S. Salunke (IUCAA), Harsha K. H. (IUCAA), A. Goyal (IITB), A. Arya (IITB), S. Puri (IITB), G. Waratkar (Caltech/IITB), V. Bhalerao (IITB),  A. Vibhute (IUCAA), 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 GRB 261026B which was also detected by Fermi (Fermi GBM Team, GCN Circ. 46032), NuSTAR (Waratkar et. al., GCN Circ. 46052), and SVOM/GRM (via notices).\n\nThe source was detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2026-10-26 07:21:19.60 UTC. The measured peak count rate associated with the burst is 244 (+36, -24) counts/s above the background in the combined data of three quadrants (out of four), with a total of 2741 (+283, -323) counts. The local mean background count rate was 216 (+2, -2) counts/s. We measure a T90 of 21 (+4, -3) s from the cumulative CZT light curve.\n\nThe source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed a peak at 2026-10-26 07:21:19.60 UTC. The measured peak count rate associated with the burst is 313 (+49, -30) counts/s above the background in the combined data of three quadrants (out of four), with a total of 3030 (+347, -443) counts. The local mean background count rate was 540 (+3, -4) counts/s. We measure a T90 of 18 (+4, -3) s from the cumulative Veto light curve.\n\nCZTI data products like interactive and downloadable light curves for this GRB can be found at: \nhttps://astrosat.iucaa.in/cift/cift_products/ET20261026T072117/ET20261026T072117_details.html\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",
  "subject": "GRB 261026B: AstroSat CZTI detection",
  "circularId": 46066,
  "eventId": "GRB 261026B",
  "format": "text/plain",
  "eventType": [
    "GRB",
    "Gamma-ray Transient",
    "X-ray Transient"
  ],
  "submittedHow": "web"
}