GRB100902A: optical upper limits at IAO. Kuroda, D. ; Hanayama, H. ; Miyaji, T. ; Watanabe, J. ; Yanagisawa, K. ; Yoshida, M. ; Ohta, K. ; Kawai, N. Abstract Publication: GRB Coordinates Network Pub Date: 2010 Bibcode: 2010GCN.11206....1K