{
  "createdOn": 1772456946817,
  "bibcode": "2026GCN.43894....1V",
  "submittedHow": "email",
  "body": "A. Volnova (IKI),  A. Pozanenko (IKI), E. Klunko (ISTP), N. Pankov (IKI)\n report on behalf of IKI-GRB-FuN:\n\nWe observed the field of the fast X-ray transient EP260227a (Wang et al.,\nGCN 43869) with the AZT-33IK 1.5m telescope of the Mondy observatory\nstarting on 2026-02-28 (UT) 20:55:14 and taking several 90-seconds frames\nin the R band. The optical counterpart (Eyles-Ferris et al., GCNs 43867,\n43877, 43888; Li et al., GCN 43868; Fu et al., GCN 43873; Mandarakas et\nal., GCN 43874; Eyles-Ferris and Tanvir, GCN 43875; Malesani et al., GCN\n43876; Strausbaugh et al., GCN 43879; Bochenek et al., GCN 43880; Gassert\net al., GCN 43881; Gupta et al., GCN 43884; Ma et al., GCN 43887; Zhong et\nal., GCN 43891) is barely detected in the stacked frame. Preliminary\nphotometry and observational details are the following:\n\nDate        UT start  t-T0      Exp.    Filter Obj.   S/N  UL(3 sigma)\n                     (mid,days) (n*s)                      (3sigma)\n2026-02-28  20:55:14  1.05053   40*90   R      21.8   2.5   21.5\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",
  "circularId": 43894,
  "eventId": "EP260227a",
  "subject": "EP260227a: Mondy optical observations",
  "submitter": "Alina Volnova at IKI RAS <alinusss@gmail.com>"
}