TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3299 SUBJECT: GRB050421: P60 Observations DATE: 05/04/21 09:54:40 GMT FROM: S. Bradley Cenko at Caltech S. Bradley Cenko and Derek B. Fox (Caltech) report on behalf of the Caltech-NRAO-GRB collaboration: We have imaged the field of GRB050421 (GCN #3296) with the automated Palomar 60-inch telescope. Observations consisted of 17 x 120 s images in the Kron R band, taken at a mean epoch of 08:50 UT (~ 4.6 hours after the burst). We find no sources in the XRT error circle reported in GCN #3296. Our 3.0-sigma limiting magnitude, estimated by comparison with several stars from the Guide Star Catalog, is approximately R < 22.0.