TITLE: GCN CIRCULAR NUMBER: 8418 SUBJECT: GRB081025: RTT150 optical observations DATE: 08/10/27 09:09:48 GMT FROM: Rodion Burenin at IKI, Moscow I. Khamitov (TUG), N. Aleksandrovich, R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Bikmaev, N. Sakhibullin (KSU/AST), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) report: We observed the field of the Swift-BATSS GRB 081025 (Copete et al., GCN8409) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey), starting at 25 Oct, 19:51 UT, i.e. approximately 11.5 hours after the burst, using Andor CCD. We made 3x300s exposures in sdss-g filter, at high zenith distance (~70 degree) and with bad seeing ~ 3". We do not detect any new source inside the XRT error circle (Mao et al., GCN8411) as compared to DSS plates. Using photometric solution from previous nights we estimated the limiting magnitude of combined image as m_g ~ 22.