GRB 170906A: Swift detection of a burst with an optical afterglow. Siegel, M. H. ; Burrows, D. N. ; Cummings, J. R. ; Gronwall, C. ; Kennea, J. A. ; Lien, A. Y. ; Marshall, F. E. ; Palmer, D. M. ; Sbarufatti, B. ; Tohuvavohu, A. Abstract Publication: GRB Coordinates Network Pub Date: 2017 Bibcode: 2017GCN.21821....1S