{
  "createdOn": 1764601228271,
  "bibcode": "2025GCN.42922....1V",
  "body": "A. A. Volnova (IKI), A. S. Pozanenko (IKI), E. Klunko (ISTP), N. S. Pankov (HSE, IKI) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of the X-ray transient EP251130a (Wu et al., GCN 42903; Zhang et al., GCN 42915), also detected by Swift/XRT (Evans et al., GCN 42908) with the AZT-33IK 1.5m telescope of the Sayan Solar Observatory (Mondy) starting on 2025-11-30 (UT) 15:06:18 in R filter. The optical counterpart (Dornic et al., GCN 42904; He et al. GCN 42914; Gupta et al. GCN 42916; Zheng et al. GCN 42917; van Dalen et al., GCN 42918; Moskvitin and Spiridonova, GCN 42919; Aryan et al., GCN 42921) is detected in the stacked frame. Preliminary photometry is the following:\n\nDate        UT start  t-T0       Exp.    Filter  OT     Err.  UL      Site/Instrum\n                     (mid,days)  (n*s)                       (3sigma)\n2025-11-30  15:06:18  0.18716    60*120  R       21.76  0.20  22.1    Mondy/AZT-33IK\n\nThe photometry is calibrated using USNO-B1.0 stars from Moskvitin and Spiridonova, GCN 42919, and is not corrected for the Galactic extinction.",
  "subject": "EP251130a: Mondy optical observations",
  "submittedHow": "web",
  "format": "text/plain",
  "eventId": "EP251130a",
  "circularId": 42922,
  "submitter": "Alina Volnova at IKI RAS <alinusss@gmail.com>"
}