TITLE: GCN CIRCULAR NUMBER: 23705 SUBJECT: GRB 190114B: MITSuME Akeno optical upper limits DATE: 19/01/15 05:48:16 GMT FROM: Ryosuke Itoh at Tokyo Institute of Tech. R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita, K. Shiraishi, K. Iida, M. Niwano, R. Adachi, M. Oeda, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration We searched for the optical counterpart of GRB 190114B (M. Siegel et al., GCN #23686) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope at Akeno Observatory,Yamanashi, Japan. The observation started on 19:33:01 UT which corresponds to 109 sec after the trigger. We did not find any new point source within the enhanced XRT circle (Goad et al., GCN #23691; Fernandez-Garcia et al., GCN #23694; Pozanenko et al., GCN #23696; Xin et al., GCN #23703) in all three bands. We obtained following 5 sigma limits for the magnitudes. T0+[sec] MID-UT T-EXP[sec] g' Rc Ic ------------------------------------------------------------------------------------------------------- 109 19:37:35 480 >19.4 >18.7 >18.2 ------------------------------------------------------------------------------------------------------- T0+ : Elapsed time after the burst T-EXP: Total Exposure time We used UCAC-4 catalog for flux calibration.