TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3342 SUBJECT: GRB 050502a: RBO Observations DATE: 05/05/03 15:03:37 GMT FROM: Melissa Nysewander at UNC,Chapel Hill D. Allen, J. Silvey and R. Canterna report on behalf of the RBO Team of the FUN GRB Collaboration: We observed the position of the afterglow of GRB 050502a (Yost et al., GCN 3322; Gotz et al., GCN 3323) with the Red Buttes Observatory 24-inch telescope under high humidity and non photometric conditions. We do not detect the afterglow down to the following values: UT Start Time Filter Limiting Since GRB (hr) Magnitude 08:04 5.83 R 19.1 09:08 6.90 R 20.1 09:19 7.08 I 18.3 10:40 8.43 I 19.0 10-sigma limiting magnitudes were derived from the USNO-B1.0 catalogue.