GRB 050820: high resolution spectroscopy from Keck. Prochaska, J. X. ; Bloom, J. S. ; Wright, J. T. ; Butler, R. P. ; Chen, H. W. ; Vogt, S. S. ; Marcy, G. W. Abstract Publication: GRB Coordinates Network Pub Date: 2005 Bibcode: 2005GCN..3833....1P