GRB 991208 Keck spectroscopy. Djorgovski, S. G. ; Dierks, A. ; Bloom, J. S. ; Kulkarni, S. R. ; Filippenko, A. V. ; Hillenbrand, L. A. ; Carpenter, J. Abstract Publication: GRB Coordinates Network Pub Date: December 1999 Bibcode: 1999GCN...481....1D