GRB 000620, optical observations. Gorosabel, J. ; Henden, A. ; Castro-Tirado, A. J. ; Gutierrez, P. ; Klose, S. ; Greiner, J. ; Castro Cerón, J. M. ; Costa, E. ; Feroci, M. Abstract Publication: GRB Coordinates Network Pub Date: 2000 Bibcode: 2000GCN...734....1G