GRB 021004, spectroscopic observations. Castander, F. J. ; Gawiser, E. ; Foltz, C. ; West, S. ; Williams, G. ; Falco, E. ; Matheson, T. ; Stanek, K. Z. ; Garnavich, P. ; Macri, L. Abstract Publication: GRB Coordinates Network Pub Date: 2002 Bibcode: 2002GCN..1599....1C