GCN Circular 26519
A. Moskvitin on behalf of larger GRB follow-up team report. We observed the field of the GRB 191220A with the SAO RAS Zeiss-1000 telescope equipped with the MMPP (Multi-Mode Photometer-Polarimeter). The observations were started since 1.419 hours after the trigger (Laha et al., GCNC #26516). We obtained 8 x 300 sec. frames in Rc band (14:54:44 -- 15:39:44 UT). Within the enhanced XRT error circle (Evans, GCNC #26515) we detect single object, possible OT, with the coordinates R. A. = 18:45:31.10, Decl. = +26:39:20.8, +/- 0".3, Epoch = 2000. ftp://ftp.sao.ru/pub/grb/GRB191220A/GRB_possibleOT.jpg Preliminary brightness of the object is R = 20.46 +/- 0.08 (T_mid - T0 = 1.794 h). Photometry were made against the R2 magnitudes of nearby USNO-B1 stars.