XRF 040916, optical follow-up. de Ugarte Postigo, A. ; Reverte-Paya, D. ; Gorosabel, J. ; Guziy, S. ; Jelinek, M. ; Vilchez, J. ; Castro-Tirado, A. J. Abstract Publication: GRB Coordinates Network Pub Date: 2004 Bibcode: 2004GCN..2717....1D