TITLE: GCN CIRCULAR NUMBER: 12879 SUBJECT: GRB 120118B: RTT150 optical observations DATE: 12/01/19 19:47:54 GMT FROM: Rodion Burenin at IKI, Moscow I. Bikmaev, A.Galeev , N. Sakhibullin (Kazan University), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Khamitov, Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) report: The field of GRB 120118B (Littlejohns et al., GCN 12852) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey) in January 18/19, 2012, during UT 20:29 -- 01:01, i.e. starting approximately 3.5 hours after the burst. A serie of 3 exposures by 900 sec and 10 exposures by 600 sec each in Rc filter was obtained at moderate seeing conditions of 1.8-2.3 arcsec. We found no optical source within the 1.8" enhanced XRT error circle (Osborne et al., GCN 12857) in our combined image at a limiting magnitude of Rc ~ 23.2 mag.