GRB 040511: optical observations. Gorosabel, J. ; Jelinek, M. ; Mendez, J. ; Ruiz-Lapuente, P. ; Castro Cerón, J. M. ; Ugarte, P. ; Castro-Tirado, A. J. Abstract Publication: GRB Coordinates Network Pub Date: 2004 Bibcode: 2004GCN..2592....1G