GRB190109B: MITSuME Akeno optical upper limits. Oeda, M. ; Murata, K. L. ; Itoh, R. ; Tachibana, Y. ; Harita, S. ; Morita, K. ; Shiraishi, K. ; Iida, K. ; Niwano, M. ; Adachi, R. ; Yatsu, Y. ; Kawai, N. Abstract Publication: GRB Coordinates Network Pub Date: 2019 Bibcode: 2019GCN.23711....1O