GRB980703 (optical r observations). Zapatero Osorio, M. R. ; Castro-Tirado, A. ; Gorosabel, J. ; Oscoz, A. ; Kemp, S. ; Frontera, F. ; Nicastro, L. Abstract Publication: GRB Coordinates Network Pub Date: 1998 Bibcode: 1998GCN...130....1Z