{
  "createdOn": 1787761613077,
  "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 the GRB 260808B discovered by the SVOM\n(Bouchet et al., GCN 45316; Brunet et al., GCN 45333), and also\ndetected by EP-FXT (Wang et al., GCN 45322) with the Zeiss-1000,\nSAO RAS telescope + CCD photometer. A set of 7 x 300 sec images\nin Rc band were obtained on August 12, 22:44:17 -- August 13,\n00:05:06 UT.\n\nThe OT (Turpin et al., GCNs 45317; 45318; Li et al. GCN 45320;\nAdami et al., GCN 45323; Saccardi et al., GCN 45328; Schneider et al.,\nGCN 45329; Bochenek and Perley, GCN 45330; Basa et al., GCN 45341;\nBurkhonov et al., GCN 45352; Li et al. GCN 45359; Moskvitin et al.,\nGCN 45360; Guelfand et al., GCN 45364; de Ugarte Postigo et al.\nGCN 45379; Bochenek and Perley, GCN 45380) is clearly detected\nin our stacked image. Details of the observation are the following.\n\nDate,      UTstart, t-T0,   Exp., Filter, Mag,     Err.,     UL\n                    (mid,d) (n*s)                          (3-sigma)\n2026-08-12 22:44:17 4.37759 7*300 Rc     21.52 +/- 0.06      23.6\n\nIn comparison with our first epoch of observations (~0.42 days,\nsee Moskvitin et al., GCN 45360) OT became 0.9 mag brighter.\nWe can confirm rebrightening reported by Li et al. GCN 45359 and\nGuelfand et al., GCN 45364.\n\nThe preliminary photometry (Vega) is based on nearby SDSS stars\n(Lupton 2005 transformation) and not corrected for Galactic extinction.\n",
  "subject": "GRB 260808B: SAO RAS observations of the optical rebrightening",
  "submittedHow": "email",
  "circularId": 45449,
  "eventId": "GRB 260808B",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>"
}