TITLE: GCN CIRCULAR NUMBER: 8102 SUBJECT: GRB 080810: RTT150 optical observations DATE: 08/08/13 13:46:42 GMT FROM: Irek Khamitov at TUG A. Galeev (KSU/AST), I. Khamitov (TUG), I. Bikmaev, N. Sakhibullin (KSU/AST), R. Burenin, M. Pavlinsky, R. Sunyaev (IKI), Z. Eker (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.) report: We observed the GRB 080810 afterglow (Page et al. GCN Circ. 8080) with Russian-Turkish 1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory, Turkey). The series of several exposures in V,Rc,Ic bands were made by using Andor CCD starting at 13 Aug 2008, 00:24 UT, i.e. ~ 59.23 hours after the burst. Using USNO-B1.0 stars we estimate an Rc magnitude of 21.60+/-0.05 (~59.85 hours after the burst). This measurement deviates from the power law decay with index -0.9 (Galeev et al., GCN8098,Guidorzi et al, GCN8099), that indicates steeper fading of OT after 48h. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.