TITLE: GCN CIRCULAR NUMBER: 11672 SUBJECT: GRB 110205A: optical observations in Mondy observatory DATE: 11/02/08 19:00:44 GMT FROM: Alina Volnova at SAI MSU A. Volnova , E. Klunko (ISTP), A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report: We observed the Swift GRB 110205A (Beardmore et al., GCN 11629) with AZT-33IK telescope of Sayan observatory (Mondy) on Feb.05 between (UT) 12:06:19 and 20:25:34, and we took several series in R-band with exposures 60 - 180s. The optical afterglow (Beardmore et al., GCN 11629) is clearly detected on the stacked images. The photometry calibration performed against the USNO-B1.0 star 1575-0155390 ((J2000) RA = 10:58:34.20, Dec = +67:31:45.3), assuming R = 16.7: T0+ Filter, Exposure, OT mag., UpperLimit (mid, d) (s) 0.43968 R 51x60 19.88+/-0.04 21.9 0.71912 R 25x120+20x180 20.85+/-0.05 22.8 The power-law decay index during our observation is alpha ~1.8 which is consistent with the index reported by Urata et al., GCN 11648. [GCN OPS NOTE(08aug11): Per author's request, the spelling of the EK author was corrected.]