{
  "createdOn": 1725187795576,
  "submittedHow": "email-legacy",
  "eventId": "GRB 240825A",
  "bibcode": "2024GCN.37367....1B",
  "submitter": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
  "subject": "GRB 240825A: TSHAO Optical Upper Limit",
  "body": " S. Belkin (HSE, IKI), I. Reva (FAI), A. Pozanenko (IKI), N. Pankov (HSE,\nIKI) report on behalf of the IKI GRB FuN:\n\nWe observed the field of Fermi GRB 240825A (Fermi GBM Team, GCN 37273;\nGupta et al., GCN 37274; Di Lalla et al., GCN 37288; Kuin et al., GCN\n37296; Joshi et al., GCN 37298; Sharma and Meegan, GCN 37301; Frederiks et\nal., GCN 37302; Laskar et al., GCN 37314) using the Zeiss-1000 telescope at\nTien Shan Astronomical Observatory, starting on 2024-08-26 at 15:04:36 UT\nin the R filter. We did not detect the optical afterglow (Gupta et al., GCN\n37274; Jiang et al., GCN 37275; Dutton et al., GCN 37276; Odeh and\nGuessoum, GCN 37277; Zhang et al., GCN 37278; Li et al., GCN 37280; Izzo et\nal., GCN 37287; Lipunov et al., GCN 37289; Leonini et al., GCN 37291;\nSVOM/C-GFT Team, GCN 37292; Martin-Carrillo et al., GCN 37293; Brivio et\nal., GCN 37295; Kuin et al., GCN 37296; Odeh and Guessoum, GCN 37299; Le\nFloc’h et al., GCN 37300; Guiffreda et al., GCN 37303; Zheng and\nFilippenko, GCN 37304; Wang et al., GCN 37306; Maksut et al., GCN 37307;\nMelandri et al., GCN 37310; Moskvitin et al., GCN 37313, 37336 ; Romanov\nGCN 37336; Qiu et al., GCN 37338; Freeburn et al., GCN 37361; ) at a\nredshift of z = 0.659 (Martin-Carrillo et al., GCN 37293; Melandri et al.,\nGCN 37310).\n\nPreliminary photometry is as follows:\nDate UT Start t-T0 (mid, days) Filter Exp. (s) OT Err. UL (3σ)\n2024-08-26 15:04:36 0.98097 R 21x120 n/d n/d 21.3\n\nThe photometry was based on nearby USNO-B1.0 stars:\nRA DEC R2\n22:58:26.6335 +01:01:11.863 14.45\n22:58:14.8740 +00:55:48.392 13.57\n",
  "circularId": 37367
}