TITLE: GCN CIRCULAR NUMBER: 22340 SUBJECT: GRB 180115A: MITSuME Akeno optical upper limits DATE: 18/01/15 11:42:54 GMT FROM: Katsuhiro L. Murata at Nagoya U K. L. Murata, R. Itoh,T. Yoshii, Y. Tachibana, S. Harita, 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 GRB 180115A (Cannizzo et al., GCN Circular #22335) 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 2018-01-15 09:25:40 UT. We did not find the previously reported candidate afterglow (Cannizzo et al., GCN Circular #22335) in all three bands. We obtained following limits for the magnitudes. T0+[hour] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------------------------------------------------- ~5.16 10:06:44 4320 >19.8 >19.6 >19.0 ------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.