GRB/XRF 020427, detection of an underlying system with the VLT. Castro-Tirado, A. ; Gorosabel, J. ; Sanchez-Fernandez, C. ; Lund, N. ; Brandt, S. ; Castro Cerón, J. M. Abstract Publication: GRB Coordinates Network Pub Date: 2002 Bibcode: 2002GCN..1439....1C