TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3259 SUBJECT: GRB 050412: PROMPT VRcIc Observations DATE: 05/04/13 19:53:06 GMT FROM: Melissa Nysewander at UNC,Chapel Hill M. Nysewander, D. Reichart, J. A. Crain report on behalf of the UNC team of the FUN GRB Collaboration: We observed the BAT localization of GRB 050412 (Cummings et al., GCN 3237) with PROMPT beginning 5m 50s after the burst. We do not detect a source within the XRT localization (Tamburelli et al., GCN 3241; Mangano et al. GCN 3253) nor the source identified by Jensen et al. (GCN 3243). 3-sigma limiting magnitudes are based on 10 USNO-B1.0 stars for Rc and Ic observations, and 10 NOMAD stars for V observations: Start Time Integration Filter Limiting Telescope Since GRB Time Magnitude 5m 50s 10 x 10s Rc 18.5 PROMPT-5 8m 48s 10 x 10s Ic 18.0 PROMPT-5 + 1 x 20s 14m 30s 1 x 30s Rc 17.9 PROMPT-5 15m 46s 3 x 30s V 20.0 PROMPT-5 + 10 x 60s 39m 44s 10 x 60s Rc 20.3 PROMPT-5 50m 42s 10 x 60s Ic 18.9 PROMPT-5 61m 46s 10 x 60s V 19.2 PROMPT-5 73m 22s 10 x 60s Rc 20.0 PROMPT-5 84m 29s 10 x 60s Ic 18.3 PROMPT-5 95m 24s 30 x 60s Rc 17.6 PROMPT-5 PROMPT is still being built and commissioned.