{
  "circularId": 44918,
  "createdOn": 1781215525819,
  "subject": "GRB 260610B / AT2026owq: SAO RAS optical observations",
  "submittedHow": "web",
  "bibcode": "2026GCN.44918....1M",
  "body": "A. Moskvitin (SAO RAS), O. Spiridonova (SAO RAS), A. Pozanenko (IKI),\nA. Volnova (IKI), N. Pankov (IKI) report on behalf of GRB follow-up team\n\nWe observed the field of GRB 260610B discovered by Fermi (The Fermi\nGBM team, GCN 44891; GCN 44901) with the Zeiss-1000 1-m telescope\nof SAO RAS equipped with the CCD photometer. The observations\ncarried out in BVRcIc filters starting June 11, 19:43:01 UT\n(since ~ 1.4 days since trigger).\n\nThe OT (O'Neill et al., GCN 44903; Watson et al., GCN 44905;\nZhu et al., GCN 44909; Gillanders et al., GCN 44910; Akl et al.,\nGCN 44911; O'Neill et al., GCN 44914) is clearly detected in\nour frames with the following brightness:\n\nDate,      UTstart, t-T0,   Exp., Filter, Mag, Err., UL\n                    (mid,d) (n*s)                    (3-sigma)\n2026-06-11 19:43:01 1.40315 2*300 Rc      19.73 0.03 22.6\n\nThis preliminary photometry is based on nearby SDSS stars\n(using Lupton 2005 transformation equations) and not corrected\nfor Galactic extinction. The observations are ongoing.",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "eventId": "GRB 260610B",
  "format": "text/plain"
}