GRB 111209A: PROMPT optical observations of early afterglow. Nysewander, M. ; Haislip, J. ; Lacluyze, A. ; Ivarsen, K. ; Reichart, D. ; Moore, J. ; Trotter, A. ; Egger, R. ; Foster, A. ; Oza, A. ; Cromartie, T. ; Speckhard, E. ; Crain, J. A. Abstract Publication: GRB Coordinates Network Pub Date: 2011 Bibcode: 2011GCN.12645....1N