GRB 040511: second epoch optical observations. Morrell, N. ; Chen, H. -W. ; Bloom, J. S. ; Prochaska, J. X. ; Dullighan, A. ; Ricker, G. ; Butler, N. ; Vanderspek, R. Abstract Publication: GRB Coordinates Network Pub Date: 2004 Bibcode: 2004GCN..2594....1M