TITLE: GCN CIRCULAR NUMBER: 22087 SUBJECT: GRB 171102B: MITSuME Akeno optical upper limits DATE: 17/11/03 12:12:39 GMT FROM: Katsuhiro L. Murata at Nagoya U S. Harita, R. Itoh, K. L. Muarata, Y. Tachibana, T. Yoshii, K. Morita, T. Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We searched for the optical counterpart of GRB171102B (T. N. Ukwatta et al., GCN Circular #22082) 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 2017-11-03 09:05:03.04 UT . We did not find any new point source within XRT circle in all three bands. We obtained following limits for the magnitudes. T0+[hour] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------------------------------------------------- ~17.742 09:24:59 300 >18.2 >17.5 >16.9 ------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.