{
  "subject": "GRB 251026A: Mondy optical upper limit",
  "eventId": "GRB 251026A",
  "body": "A. Volnova (IKI), A. Pozanenko (IKI) , N. Pankov (HSE, IKI), E. Klunko (ISTP) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of GRB 251026A detected by SVOM/ECLAIRs (Cao et al., GCN 42454) in the R-filter with the AZT-33IK 1.5m telescope of the Sayan Solar Observatory (Mondy) starting Oct. 26, 2025, 20:15:58 (UT) taking several frames with 120 s exposures. Inside the error box of the SVOM/MXT (Cao et al., GCN 42454) we did not detect any new uncatalogued source. Photometry and observational details are the following:\n\nDate        UT start  t-T0       Exp.    Filter  OT     Err.  UL\n                     (mid,days)  (n*s)                       (3sigma)\n2025-10-26  20:15:58  0.51293    30*120  R       n/d    n/d   22.4\n\nThe photometry is based on several nearby PS1 stars (R-magnitudes Lupton's transformation) and is not corrected for the Galactic extinction.",
  "format": "text/plain",
  "circularId": 42476,
  "submittedHow": "web",
  "submitter": "Alina Volnova at IKI RAS <alinusss@gmail.com>",
  "bibcode": "2025GCN.42476....1V",
  "createdOn": 1761572048740
}