TITLE: GCN CIRCULAR NUMBER: 18948 SUBJECT: GRB 160127A: MITSuME Akeno optical upper limits DATE: 16/01/29 08:23:14 GMT FROM: Taketoshi Yoshii at Tokyo Tech Y.Saito, T.Fujiwara, T. Yoshii, Y. Tano, Y. Tachibana, Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration: We searched for the optical counterpart of GRB 160127A (A. Amaral-Rogers et al., GCN Circular #18938) 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 2016-01-27 17:04:39 UT (~8.4 h after the burst). We did not find previously reported afterglow (A. Amaral-Rogers et al., GCN Circular #18938; A. Klotz et al., GCN Circular #18939; A. Cucchiara et al., GCN Circular #18941) in all three bands. We obtained following limits for the magnitudes. T0+[hour] MID-UT T-EXP[sec] g' Rc Ic ----------------------------------------------------------------------------- 10.19 18:54:38 11700 > 20.7 > 20.4 > 19.2 ----------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used GSC2.3 catalog for flux calibration.