GRB 070419B optical afterglow candidate. Tristram, P. ; Castro-Tirado, A. J. ; de Ugarte Postigo, A. ; Gilmore, A. ; Kilmartin, P. ; Gorosabel, J. ; Jelinek, M. ; Cunniffe, R. Abstract Publication: GRB Coordinates Network Pub Date: 2007 Bibcode: 2007GCN..6314....1T