TITLE: GCN CIRCULAR NUMBER: 14891 SUBJECT: GRB 130610A: iTelescope T21 optical observations DATE: 13/06/13 05:26:42 GMT FROM: Veli-Pekka Hentunen at Taurus Hill Obs,A95 Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill Observatory, Varkaus, Finland) report: We have detected GRB 130610A optical afterglow at iTelescope observatory T21 (Mayhill, New Mexico) 0.43m/6.8 astrograph and FLI-PL6303E CCD camera. Three unfiltered images and three photometric R filter images with 300 sec exposure time were made. The afterglow was detected at following position RA 14:57:40.86 and DEC +28:12:26.0 The following magnitudes were obtained from the observations using NOMAD1 1182-0257977 (R=14.110) as the comparison: Tmid(sec)+T0 Filter Exp. time Mag Mag err. 2442 unfiltered 300 19.09CR 0.15 2759 unfiltered 300 19.34CR 0.19 3076 unfiltered 300 19.17CR 0.16 3717 R 300 19.58R 0.32 4034 R 300 19.93R 0.44 4351 R 300 19.93R 0.43