{
  "createdOn": 1736869924013,
  "submitter": "Moskvitin Alexander at SAO RAS <mosk@sao.ru>",
  "format": "text/plain",
  "subject": "EP250111a: SAO RAS optical upper limit",
  "circularId": 38940,
  "submittedHow": "web",
  "eventId": "EP250111a",
  "bibcode": "2025GCN.38940....1M",
  "body": "A. S. Moskvitin and O. I. Spiridonova (SAO RAS),\nreport on behalf of the GRB follow-up team.\n\nWe observed the field of X-ray transient EP250111a detected by EP\n(Zhao et al., GCN 38905) and Swift (Kennea et al., GCN 38910) \nwith the SAO RAS 1-m telescope Zeiss-1000 on January 11, \n18:51:53--19:56:25 UT (t_mid - T0 = 18.057 hours = 0.7524 days).\nWe obtained 10 x 300 sec. images in Rc band.\n\nWe did not detect the OT (Fu et al., GCN 38906; Pankov et al., \nGCN 38913; Zheng et al., GCN 38916) in the stacked image \ndown to the limiting magnitude of R_lim > 21.15 (calibrated anainst\nnearby USNO-B1 stars and not corrected for the MW extinction)."
}