TITLE: GCN CIRCULAR NUMBER: 15418 SUBJECT: GRB 131030A: T21 optical observations DATE: 13/10/31 15:45:15 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 131030A optical afterglow at iTelescope observatory T21 (Mayhill, New Mexico). We used 0.43-m/6.8 astrograph and FLI-PL6303E CCD. Three unfiltered images and three photometric R filter images with 600 sec exposure time were made. The afterglow was detected at the following position RA 23:00:16.17 and DEC -05:22:05.0. The following magnitudes were obtained from the observations using NOMAD1 0846-0702870 (R=17.120) as a comparison star: Tmid(h)+T0 Filter Exp. time (sec) Mag Mag err. 8.53 unfiltered 3x600 18.57CR 0.12 9.26 R 3x600 19.43R 0.24