TITLE: GCN CIRCULAR NUMBER: 14618 SUBJECT: GRB 130508A: MITSuME Akeno upper limits DATE: 13/05/10 13:04:03 GMT FROM: Yoichi Yatsu at Tokyo Tech. Y. Saito, Y. Yano, R. Usui, Y. Tachibana, K. Ito, T. Yoshii, S. Kurita, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed the field of GRB 130508A (Holland et al., GCNC 14607) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation started on 2013-05-08 17:10:32 UT ( ~99 sec after the burst). And we could not find any new point source within the XRT error circle (Holland et al., GCNC 14607) in all the three bands. The results of photometry (3 sigma upper limits) are listed below. We used GSC2.3 catalog for flux calibration. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------ ------------------------------- 283 17:13:30 240 >19.4 >19.1 >18.0 2803 17:55:30 4320 >20.7 >20.4 >19.1 ------------------------------------------------------------ ------------------------------- T0+ : Elapsed time after the burst [sec] T-EXP: Total Exposure time [sec]