GRB 130131B: Mitsume akeno optical upper limits. Hayashi, M. ; Yoshii, T. ; Usui, R. ; Aoki, Y. ; Kurita, S. ; Saito, Y. ; Yatsu, Y. ; Kawai, N. Abstract Publication: GRB Coordinates Network Pub Date: 2013 Bibcode: 2013GCN.14193....1H