TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3780 SUBJECT: GRB 050803: PROMPT BVRcIc Observations DATE: 05/08/08 01:56:17 GMT FROM: Josh Haislip at U.North Carolina J. Haislip, D. Reichart report on behalf of the UNC team of the FUN GRB Collaboration: Under the control of Skynet, PROMPT automatically observed the localization of GRB 050803 (Band et al., GCN 3748) beginning 7.1 hours after the burst in repeating blocks of BVRcIc (two simultaneously). We do not detect any new sources within or around the XRT localization. In a 54 x 40 sec integration of mean epoch 10.0 hours after the burst, we measure a 3-sigma limiting magnitude of Rc = 21.4, based on 3 USNO-B1.0 stars. PROMPT is still being built and commissioned.