{
  "body": "A. Volnova (IKI), E. Klunko (ISTP), N. Pankov (IKI), A. Pozanenko (IKI)\nreport on behalf of IKI-GRB-FuN:\n\nWe continued observations of the field of GRB 260131A/B (Fermi GBM Team,\nGCN 43579; Sugai et al., GCN 43580; Roberts et al., GCN 43585; Frederiks et\nal., GCN 43590; Luo et al., GCN 43591; Jiang et al., GCN 43600; Li et al.,\nGCN 43605) with the AZT-33IK 1.5m telescope of the Mondy observatory on\nFeb. 8 starting at 13:03:46 UT and taking several frames in R band. The\noptical counterpart reported by Gompertz et al., GCN 43586; Lee et al., GCN\n43587; Saccardi et al., GCN 43595; García García et al., GCN 43599, Shi et\nal., GCN 43601; Sanchez-Ramirez et al., GCN 43604; Jayaraman et al., GCN\n43606; Zhu et al., GCN 43607; Zheng et al., GCN 43609; Adami et al., GCN\n43610; Volnova et al., GCN 43632 is detected in the stacked frame.\nPreliminary photometry and observational details are the following:\n\nDate           UT start  t-T0       Exp.    Filter Obj.    Err.   UL\nSite/Telescope\n                        (mid,days)  (n*s)                        (3sigma)\n2026-02-08     13:03:46  8.30854    56*120  R      21.70   0.09   22.8\nMondy/AZT-33IK\n\nThe photometry is based on several nearby stars from the USNO-B1 catalogue\n(R2 magnitudes) and is not corrected for the Galactic extinction.\n",
  "bibcode": "2026GCN.43670....1V",
  "eventId": "GRB 260131A",
  "createdOn": 1770649989897,
  "subject": "GRB 260131A/B: continued Mondy optical observations",
  "submitter": "Alina Volnova at IKI RAS <alinusss@gmail.com>",
  "circularId": 43670,
  "submittedHow": "email"
}