GRB 160821B: Swift detection of a short burst. Siegel, M. H. ; Barthelmy, S. D. ; Burrows, D. N. ; Lien, A. Y. ; Marshall, F. E. ; Palmer, D. M. ; Sbarufatti, B. Abstract Publication: GRB Coordinates Network Pub Date: 2016 Bibcode: 2016GCN.19833....1S