GRB 080315: optical observations. de Ugarte Postigo, A. ; Chantry, V. ; Castro-Tirado, A. J. ; Jelinek, M. ; Gorosabel, J. ; Melo, C. ; Smette, A. Abstract Publication: GRB Coordinates Network Pub Date: 2008 Bibcode: 2008GCN..7418....1D