{
  "submittedHow": "email",
  "subject": "GRB 261113A: Mondy and AbAO optical observations",
  "submitter": "Alexander Moskvitin at SAO RAS <mosk@sao.ru>",
  "body": "A. Moskvitin (SAO), A. Pozanenko (IKI), E. Klunko (ISTP),\nR. Ya. Inasaridze (AbAO), A. Volnova (IKI), N. Pankov (IKI),\nO. Spiridonova (SAO) report on behalf of IKI-GRB-FuN\nand SAO GRB follow-up team.\n\nWe observed the field of the GRB 261113A (Saccardi et al., GCN 46244)\nat the redshift of z = 3.580 (Saccardi et al., GCN 46261)\nwith the 1.5-m telescope AZT-33IK of Sayan Solar Observatory (Mondy)\nand AS-32 telescope of Abastumani Observatory (AbAO) started (UT)\n2026-11-13T15:06:44 and 2026-11-13T17:37:43 respectively.\n\nThe OT (Lei et al., GCN 46248; Li et al., GCN 46249; Yin et al.,\nGCN 46250; Chen et al., GCN 46251; Wu et al., GCN 46252; Zhao et al.,\nGCN 46253; Li et al., GCN 46254; Saikia et al., GCN 46256; Adami et al.,\nGCN 46257; Gress et al., GCN 46258; Izzo et al., GCN 46259; Saccardi et\nal.,\nGCN 46261; Maksut et al., GCN 46262; also observed in NIR: Lin et al.,\nGCN 46247; Brivio et al., GCN 46260) is clearly detected in our stacked\nimages. The results of some stacked epochs are as follows.\n\nDate       UT start t-T0    Exp,  Filter Obj       Err  UL      Telescope\n                    (mid,h) (n*s)                       (3sigma)\n2026-11-13T15:06:44 0.67833 10*60 R      19.04 +/- 0.02 22.1    AZT-33IK\n2026-11-13T15:26:45 1.01208 10*60 R      19.18 +/- 0.04 21.6    AZT-33IK\n2026-11-13T15:46:56 1.34847 10*60 R      19.35 +/- 0.03 22.0    AZT-33IK\n2026-11-13T16:09:31 1.72486 10*60 R      19.50 +/- 0.04 22.0    AZT-33IK\n2026-11-13T16:29:33 2.06708 10*60 R      19.76 +/- 0.13 20.9    AZT-33IK\n2026-11-13T16:50:35 2.40931 10*60 R      19.75 +/- 0.05 22.0    AZT-33IK\n2026-11-13T17:37:43 3.63917 40*60 R      20.48 +/- 0.17 21.3    AS-32\n\nThis preliminary photometry (Vega) is based on nearby SDSS stars\n(Lupton 2005 transformation) and not corrected for Galactic extinction.\n\nBased on our data, it can be suggested that there is a jet break\nin the light curve, occurring between 3 and 4 hours after the onset of the\nburst.\n",
  "circularId": 46263,
  "createdOn": 1794637047864,
  "eventId": "GRB 261113A"
}