TITLE: GCN CIRCULAR NUMBER: 13430 SUBJECT: Skynet/PROMPT Observations of GRB120711A DATE: 12/07/11 03:23:16 GMT FROM: Aaron LaCluyze at U.North Carolina A. Lacluyze, J. Haislip, K. Ivarsen, D. Reichart, J. Moore, H. T. Cromartie, R. Egger, A. Foster, N. Frank, M. Nysewander, A. Oza, E. Speckhard, A.Trotter, and J. A. Crain report: Skynet observed the field of GRB12711 (INTEGRAL trigger 6599) in B, V, and R starting 37 seconds after the burst. Although no afterglow was detected in the initial exposures, a transient source was detected at 06:18:42.839 -70:59:56.78 (J2000). The source rapidly brightened, peaking at roughly 112 seconds after the trigger. Preliminary peak magnitudes, calibrated to ~5 UNSO B1.0 stars are as follows: Time Tel Filt Mag 1sigERR 112 P4 R 12.117 0.008 113 P1 V 12.593 0.014 116 P3 B 14.061 0.014 The post-peak temporal index is estimated to be -2.1, suggesting a reverse shock. Further observations are ongoing.