TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3671 SUBJECT: GRB 050724: RTT150 optical observations DATE: 05/07/24 22:40:13 GMT FROM: Rodion Burenin at IKI, Moscow R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), I. Khamitov, Z. Aslan (TUG), U. Kiziloglu (METU), A. Alpar (SabUni), I. Bikmaev, N. Sakhibullin (KSU/AST) report: We observed the error box of GRB 050724 (Covino et al., GCN 3665) with Russian-Turkish 1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory, Turkey). We made a set of 600s exposures in R, starting at 18:11 UT, July 24, i.e. approximately 5.6 hours after the burst. Observations were made at very high zenith distance (65-75 degrees) and in poor seeing conditions (~2 arcsec). We found no variable sources brighter than our limiting magnitude, which is only slightly deeper than DSS. This message may be cited.