GRB 071021: (Relatively shallow) IR non-detections: motivation for optical spectroscopy. Bloom, J. S. ; Prochaska, J. X. ; Perley, D. A. ; Chen, H. -W. ; Starr, D. L. ; Modjaz, M. ; Poznanski, D. Abstract Publication: GRB Coordinates Network Pub Date: 2007 Bibcode: 2007GCN..6980....1B