GRB050309: CONCAM pre-trigger and trigger coincident optical. Tilvi, V. ; Shamir, L. ; Pereira, W. ; Cordell, D. ; Muzzin, V. ; Merlo, M. ; Nemiroff, R. Abstract Publication: GRB Coordinates Network Pub Date: 2005 Bibcode: 2005GCN..3090....1T