GRB011212: optical observations at gunma. Kinugasa, K. ; Hashimoto, O. ; Kambe, E. ; Urata, Y. ; Kohama, M. ; Torii, K. ; Kawai, N. ; Yoshida, A. ; Yamaoka, H. Abstract Publication: GRB Coordinates Network Pub Date: 2001 Bibcode: 2001GCN..1210....1K