TITLE: GCN GRB OBSERVATION REPORT NUMBER: 4220 SUBJECT: GRB 051109: PROMPT Detections DATE: 05/11/09 06:20:02 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, M. Nysewander, M. Bayliss, A. LaCluyze, D. Reichart, J. A. Crain, and A. Foster report on behalf of the UNC team of the FUN GRB Collaboration. Under the control of Skynet, PROMPT Temporary Telescope 3 automatically observed the localization of GRB 051109 (Tagliaferri et al., GCN 4213) beginning 1.7 min after the burst in repeating blocks of B and V. PROMPT Temporary Telescope 5 joined PROMPT-3 15.6 min after the burst in repeating blocks Rc and Ic. These observations were carried out in synch with PROMPT-3's observations. We detect the afterglow (Rykoff et al., GCN 4211) in single V, Rc, and Ic exposures and measure its brightness to be V ~ 16.6 mag at 3.3 min after the burst. PROMPT is still being built and commissioned.