GCN Circular 8722
A. Volnova (SAI MSU), I. Korobtsev (ISTP), A. Pozanenko (IKI), E. Klunko (ISTP), N. Bochkarev (SAI MSU), E. Karitskaja (Institute of Astronomy), on behalf of larger GRB follow up collaboration report: We observed the afterglow of GRB 080810 (Page et al. GCN 8080) with 1.5 m telescope of Sayan observatory (Mondy) under good weather conditions. Series of R and B images were obtained between Aug. 10 (UT) 16:50:03 -18:17:06. While we clearly detect afterglow in single R images, the afterglow is not detected in a combined image obtained in B. A photometry of the combined images is based on several SDSS nearby stars: T0+ Filter Exp. mag. Upper_Limit seeing mid., days (3 sigma) 0.1599 B 14x60 n/d 19.26 ~2.7" 0.1786 R 30x60 17.98 +/- 0.13 20.85 ~2.2" 0.2026 R 30x60 18.10 +/- 0.17 21.14 ~2.0" The photometry in R-band is an agreement with power law decay index of light curve (alpha = 1.12) between 400 s and 1 day after the burst reported by Thoene et al (GCN 8106).