TITLE: GCN CIRCULAR NUMBER: 12533 SUBJECT: GRB 111103B: MITSuME Akeno Optical upper limits DATE: 11/11/05 13:40:02 GMT FROM: Yoichi Yatsu at Tokyo Tech. S. Song, Y. Aoki, R. Usui, K. Kawakami, M. Hayashi, K. Tokoyoda, Y. Saito, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We observed GRB 111103B (D. Grupe et al, GCN12519) with the optical three color (g, Rc, and Ic) CCD camera attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. We started the observation about ~10.5 hour after the BAT trigger from 2011-11-04 9:35:15 UT. And we did not find any new point source within the XRT error circle (S. D. Barthelmy et al, GCN12524) in three bands. The results of photometry (3sigma upper limits) are listed below. #The photon flux were calibrated against GSC2.3 catalog. T0+[day] MID-UT T-EXP[sec] g' Rc Ic --------------------------------------------------------------------------------- 3.7×10^4 9:44:05 1020 ----- >17.9 >18.0 --------------------------------------------------------------------------------- T0+ : Elapsed time after the burst [day] T-EXP: Total Exposure time [sec]