GRB 090812: Swift detection of a burst with an optical counterpart. Stamatikos, M. ; Cummings, J. R. ; Evans, P. A. ; Gronwall, C. ; Guidorzi, C. ; Markwardt, C. B. ; O'Brien, P. T. ; Page, K. L. ; Palmer, D. M. ; Starling, R. L. C. Abstract Publication: GRB Coordinates Network Pub Date: 2009 Bibcode: 2009GCN..9768....1S