{
  "format": "text/plain",
  "circularId": 45394,
  "eventId": "EP260812a",
  "submitter": "Nicolai Pankov at IKI <colinsergesen@gmail.com>",
  "submittedHow": "web",
  "createdOn": 1787063818222,
  "eventType": [
    "X-ray Transient"
  ],
  "subject": "EP260812a: AbAO optical upper limit",
  "body": "N. Pankov (IKI), R. Ya. Inasaridze (AbAO), A. Pozanenko (IKI), M. Zhuzhunadze \n(AbAO) report on behalf of IKI-GRB-FuN:\n\nWe observed the field of the Einstein Probe fast X-ray transient EP260812a \n(Liu et al., GCN 45362) with the AS-32 telescope of Abastumani Observatory \n(AbAO). The observations were conducted on 2026-08-13 starting at 17:12:50 UT, \ni.e. ~1.267 days since trigger. The series of 66x60 sec exposures was taken in \nthe R-filter using CCD-photometer. No new sources was identified within the \nX-ray error circle (Yang et al., GCN 45373). A faint optical source found in \nthe NOT and LT observations (Corcoran et al., GCN 45376) is not detected in our \nobservations. The observation summary and preliminary upper limit are \nprovided below:\n\nDate        UTstart    t-T0    Exp.   Filter     UL\n                     (mid, d) (n*s)           (3sigma)     \n2026-08-13  17:12:50 1.26723   65x60    R       22.1\n\nThe photometry is based on nearby USNO-B1.0 stars (R2 magnitudes) and has not \nbeen corrected for the Galactic extinction. Our results are consistent with the \nupper limits reported by Yin et al. (GCN 45372), Corcoran et al. (GCN 45376), \nand Mirzakulov et al. (GCN 45387).\n"
}