TITLE: GCN CIRCULAR NUMBER: 11373 SUBJECT: GRB 101024A: GRAS06 optical observations DATE: 10/10/24 14:59:45 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report: GRAS06 (Global-Rent-a-Scope, Moorook, Australia) RCOS-16 telescope and SBIG STL-1001E CCD camera were used to detect GRB 101024A optical afterglow. The observations were started at 2010-10-24 11:58:06 (UT) and stopped at 2010-10-24 12:30:00 (UT). Three unfiltered observations with 600s exposure times were made. The afterglow was detected at following position RA 04 26 01.43 and DEC -77 15 55.9 consistent those given by Evans P.A. et al. (GCN 11370) to within positional errors. The following magnitudes were obtained from the observations using NOMAD1 0127-0023968 (V = 16.94) as the comparison: Tmid(s) + T0 Filter Exp (sec) Mag Mag err Limit 1416 unfiltered 600 19.2 0.4 21.0 2074 unfiltered 600 20.8 0.8 21.0 2730 unfiltered 600 >21.0 21.0 A jpg image of the 600sec observations is available at the following URL: http://cutenews.kassiopeia.net/data/upimages/GRB101024A.png