TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4720 SUBJECT: GRB060209: RTT150 optical observations DATE: 06/02/09 22:09:45 GMT FROM: Irek Khamitov at TUG I. Khamitov, Z. Aslan (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.), I. Bikmaev, N. Sakhibullin (KSU/AST) R. Burenin, M. Pavlinsky, R. Sunyaev (IKI) report: The error circle of GRB 060209 (Swift-BAT Trigger 180931, Osborne et al., GCN 4717) was observed with Russian-Turkish 1.5-m telescope (RTT150, Bakyrlytepe, TUBITAK National Observatory, Turkey) in R, starting on Feb. 09, 19:17 UT, i.e. ~8min after the burst. A series of frames (2*60s, 9*100s exposures) were taken under bad weather conditions. We did not detect new source. Using USNO-B1 stars we estimate limiting magnitude of combined image as: R~20.3 This message may be cited. [GCN OPS NOTE(09dec06): The Subject-line was changed from "060204" to "060209" to match the contents of the Circular.]