TITLE: GCN CIRCULAR NUMBER: 11637 SUBJECT: GRB 110205A: GRAS005 optical observations DATE: 11/02/05 07:29:33 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report: GRAS 005 (Global-Rent-a-Scope, Mayhill, New Mexico) Takahashi Epsilon 250 10" FL 850 mm and SBIG ST-10XME camera were used to detect GRB 110205A optical afterglow. The observations were started at 2011-02-05 02:56:38 (UT) and stopped at 2011-02-05 04:24:38 (UT). Four unfiltered and four photometric R observations with 300s and 600s exposure times were made. The afterglow was detected at following position RA 10 58 31.16 and DEC +67 31 31.1 consistent those given by Klotz A. et al. (GCN 11630) to within positional errors. The following magnitudes were obtained from the observations using NOMAD1 1574-0155978 (R = 16.100) as the comparison: Tmid(s)+T0 Filter Exp (sec) Mag Mag err Limit 3537 unfilt 600 16.3 0.1 19.7 4249 Rc 600 16.5 0.1 18.9 5327 unfilt 300 16.8 0.1 19.7 5858 Rc 600 17.0 0.1 18.9 6379 Rc 300 17.3 0.1 18.9 6903 unfilt 600 17.3 0.1 19.7 7993 Rc 300 17.6 0.1 18.9 8367 unfilt 300 17.6 0.1 19.7 A jpg image of the 600sec clear filter observation is available at the following URL link: http://cutenews.kassiopeia.net/data/upimages/GRB110205A.jpg