{
  "createdOn": 1786535917715,
  "body": "A. Moskvitin (SAO RAS), N. Pankov (IKI), A. Pozanenko (IKI),\nA. Volnova (IKI), O. Spiridonova (SAO RAS)\nreport on behalf of GRB follow-up team\n\nWe observed the field of the GRB 260809A discovered by the SVOM\n(Brunet et al., GCN 45331), also detected by EP-FXT (Sun et al.,\nGCN 45344) with the Zeiss-1000, SAO RAS 1-m telescope + CCD photometer\non 2026-08-09T23:20:36--2026-08-10T00:49:19 UT (t_mid = 9.1234 hours).\n\nThe OT (Li et al., GCN 45336; Adami et al., GCN 45338; Rajabov et al.,\nGCN 45339;  Izzo, Saccardi and Corcoran, GCN 45340; Basa et al.,\nGCN 45342) is clearly detected in our stacked image.\nDetails of the observation are the following.\n\nDate,      UTstart, t-T0,   Exp.,  Filter, Mag,     Err.,     UL\n                    (mid,d) (n*s)                          (3-sigma)\n2026-08-09 23:20:36 0.38014 14*300 Rc      22.60 +/- 0.17  23.4\n\nThis preliminary photometry (Vega) is based on nearby SDSS stars\n(Lupton 2005 transformation) and not corrected for Galactic extinction.\n",
  "submittedHow": "email",
  "subject": "GRB 260809A: SAO RAS optical observations",
  "eventId": "GRB 260809A",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "circularId": 45361,
  "bibcode": "2026GCN.45361....1M"
}