{
  "eventId": "GRB 240828B",
  "submittedHow": "email-legacy",
  "submitter": "Alexei Pozanenko at IKI, Moscow <grb.alex@gmail.com>",
  "bibcode": "2024GCN.37363....1B",
  "circularId": 37363,
  "subject": "GRB 240828B: AbAO optical upper limit",
  "body": " S. Belkin (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), N.\nPankov (HSE, IKI) report on behalf of GRB-IKI-FuN:\n\nWe observed the field of GRB 240828B (Le Provost, GCN 37318; Page et al.,\nGCN 37334) with the 70-cm AS-32 telescope of Abastumani Observatory (AbAO)\nin the R-filter, starting on 2024-08-29 at 23:38:46 (UT). We did not detect\nthe optical counterpart in the stacked image within the Swift-XRT error\ncircle (Page et al., GCN 37334; ). Preliminary photometry is as follows:\n\nDate UT_start t-T0 Filter Exp. OT err UL(3σ)\n(mid, days) (s)\n2024-08-29 23:38:46 1.46045 R 74×60 n/d n/d 22.0\n\nThe magnitudes were calibrated using nearby USNO-B1.0 stars.\nRA DEC R2\n04:13:38.682 +16:40:58.242 17.00\n04:13:51.313 +16:42:50.073 16.7\n",
  "createdOn": 1725120801743
}