GRB050509a: swift UVOT observations. Poole, T. ; Hurkett, C. ; Hunsberger, S. ; Breeveld, A. ; Boyd, P. ; Gehrels, N. ; Mason, K. ; Nousek, J. Abstract Publication: GRB Coordinates Network Pub Date: 2005 Bibcode: 2005GCN..3394....1P