TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3797 SUBJECT: GRB050813: RTT150 optical observations DATE: 05/08/14 00:23:08 GMT FROM: Rodion Burenin at IKI, Moscow I. Bikmaev, A. Galeev, N. Sakhibullin (KSU/AST), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), Z. Aslan, I. Khamitov, U. Kiziloglu (METU), A. Alpar (SabUni), report: We have observed the error box of GRB 050813 (GCN 3788 and GCN 3790) with Russian-Turkish 1.5-m telescope (Bakyrlytepe, Turkey), using TFOSC (the imaging and spectroscopic camera of the TUBITAK National Observatory, Turkey). We made series of 60s exposures in R during UT 18:35 - 20:25, August 13, 2005. We found almost all faint objects shown in GCN 3796 (Gorosabel et al.) in our co-added image with limiting magnitude R ~= 23. A finding chart can be found at: http://hea.iki.rssi.ru/~rodion/050813/r.jpg This message may be cited.