TITLE: GCN CIRCULAR NUMBER: 7066 SUBJECT: GRB 071112C: RTT150 optical observations DATE: 07/11/12 22:09:44 GMT FROM: Rodion Burenin at IKI, Moscow R. Burenin, (IKI), I. Khamitov (TUG), M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.), I. Bikmaev, N. Sakhibullin (KSU/AST) report: The optical counterpart of GRB 071112C (GCN 7059) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), under poor observational conditions. First image was taken 16.7 min after the burst. Assuming R=16.0 and B=16.76 magnitudes for nearby star USNO-B1.0 1183-0043866 we estimated the following magnitudes for the OT: 18:49:39 UT, B=18.8 18:54:08 UT, R=18.7 During the first hour after the burst the power law slope of the fading OT flux is -0.83 +- 0.09 in R band and is approximatly similar in BVI. This message may be cited.