{
  "eventType": [
    "GRB"
  ],
  "body": "Pankaj Pawar, Sarvesh Yadav, Dhruv Jain, Anshika Gupta, Debalina Kar and\nKuntal Misra (ARIES, Nainital, India) report:\n\nWe observed the field of GRB 261017A (Siegel et al., GCN 45974) with the\n1.3-m Devasthal Fast Optical Telescope (DFOT), India, on 2026 October 17.\nObservations started at 22:57:29 UT, approximately 6.87 hours after the\nSwift trigger. We obtained six 300-s exposures in the R filter.\n\nWe do not detect an optical source at the enhanced Swift-XRT position\n(Beardmore et al., GCN 45977) in the stacked image. Our preliminary forced\nPSF photometry yields the following nominal 5-sigma upper limit:\n\nMid-time (UT)          Tmid-T0 (d)  Filter  Exposure (s)  Mag (Vega)\n2026-10-17 23:12:41      0.29695      R       6 x 300       >22.5\n\nT0 is 2026-10-17 16:05:05 UT (Siegel et al., GCN 45974). The mid-time is\nthe exposure-weighted mean of the individual exposure mid-times.\nPhotometry was calibrated against 45 nearby Pan-STARRS stars transformed\nto approximate Cousins R magnitudes on the Vega system. The limit is based\non the local background noise, including uncertainty in the local sky\nestimate, and is not corrected for Galactic extinction.\n",
  "subject": "GRB 261017A: R-band upper limit with the 1.3-m DFOT",
  "createdOn": 1792394414305,
  "submittedHow": "web",
  "format": "text/plain",
  "circularId": 45986,
  "eventId": "GRB 261017A",
  "submitter": "pawarpankaj1492@gmail.com"
}