{
  "subject": "GRB 250328A: AbAO AS-32 Optical Observations",
  "createdOn": 1743512522756,
  "submittedHow": "web",
  "bibcode": "2025GCN.40001....1P",
  "eventId": "GRB 250328A",
  "circularId": 40001,
  "format": "text/plain",
  "submitter": "Nicolai Pankov at HSE, IKI RAS <colinsergesen@gmail.com>",
  "body": "N. Pankov (HSE, IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI) report on behalf of IKI-GRB-FuN:\n\nWe performed optical observations of the field of GRB 250328A (Brunet et. al, GCN 39910; Osborne et. al, GCN 39967) with the 0.7-meter AS-32 telescope of the Abastumani Astrophysical Observatory (AbAO). The observations started on (UT) 2025-03-28 20:21:40, i.e. about 0.17 days since trigger. The series of frames in the R-filter was obtained. We marginally detect the optical afterglow (Schneider et. al, GCN 39919; Schneider et. al, GCN 39920; Li et. al, GCN 39923; Li et. al, GCN 39936; Kumar et. al, GCN 39946; Klingler et. al, GCN 39968) in the stacked image. The preliminary photometry is as follows:\n\nDate       UT start t-T0        Exp.   Filter OT    Err     UL\n                    (mid, days) (s)                         (3sigma)\n2025-03-28 20:21:40 0.17064     82*60  R      22.2  S/N=1.7 21.6\n\nThe photometry is based on nearby stars of USNO-B1.0 and has not been corrected for the Galactic extinction."
}