{
  "format": "text/plain",
  "subject": "GRB 260102A: AbAO optical observations",
  "circularId": 43351,
  "body": "N. Pankov (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:\n\nWe performed optical observations of the field of GRB 260102A (XIE et. al, GCN 43295; Evans, GCN 43298; Bernardini et. al, GCN 43304; Yin et. al, GCN 43307; Hamburg, GCN 43308) in the R-filter with the 0.7-meter AS-32 telescope of Abastumani Observatory (AbAO). Two epochs of observations were taken, the first one began on 2026-01-02 19:21:22 UT, i.e. ~0.65 days since trigger. The optical counterpart (Wu et. al, GCN 43300) was not detected in the co-add images of both epochs. The preliminary upper limits and the observation details are given below:\n\nDate       UT start  t-T0         Exp.    Filter   OT   Err. UL\n                     (mid, days)  (s)                        (3sigma)\n2026-01-02 19:21:22  0.65786      72*60   R        n/d  n/d  20.1\n2026-01-03 19:22:18  1.65850      72*60   R        n/d  n/d  19.8\n\nThe photometry was calibrated using nearby stars from USNO-B1.0 and was not corrected for the Galactic extinction. The obtained results do not contradict the optical upper limits from other groups (Antier et. al, GCN 43303; Saccardi et. al, GCN 43305).",
  "eventId": "GRB 260102A",
  "bibcode": "2026GCN.43351....1P",
  "submittedHow": "web",
  "createdOn": 1767882514356,
  "submitter": "Nicolai Pankov at IKI <colinsergesen@gmail.com>"
}