TITLE: GCN CIRCULAR NUMBER: 12713 SUBJECT: GRB 111210A: optical upper limit of Mt. Terskol observatory DATE: 11/12/22 14:48:58 GMT FROM: Alina Volnova at SAI MSU A.Volnova (SAI MSU), M. Andreev, A. Sergeev  (Terskol Branch of INASAN), V. Petkov (Baksan Neutrino Observatory of INR), N. Karpov, O. Andrienko, K. Martynyuk-Lototsky, N. Parakhin, N. Borachok, V. Kozlov, G. Butenko, V. Godunova (IC AMER, NASU), A. Pozanenko (IKI) report: We observed the field of GRB 111210A (Siegel et al., GCN 12650) with Zeiss-600 telescope of Mt.Terskol observatory on Dec 11 between 01:06:25 and 03:09:45 UT under poor weather condition and mean seeing of about 2.2". We took 120 frames in R-band with exposure of 60 seconds. In a stacked frame we did not detect any source within the enhanced XRT error circle (Goad et al., GCN 12652). The photometry of the field is based on a few stars from USNO-B1.0 catalogue. t-t0               filter   exp.        OT    uplim (3sigma) (mid., days)            (s) 0.48006         R      120x60    n/d     18.6