GRB 130612A: Swift detection of a burst with an optical counterpart. Racusin, J. L. ; Cummings, J. R. ; Gehrels, N. ; Kennea, J. A. ; Markwardt, C. B. ; Marshall, F. E. ; Pagani, C. ; Page, K. L. ; Palmer, D. M. ; Sbarufatti, B. ; Siegel, M. H. Abstract Publication: GRB Coordinates Network Pub Date: 2013 Bibcode: 2013GCN.14874....1R