TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3163 SUBJECT: GRB 050401: Optical afterglow candidate DATE: 05/04/01 15:48:05 GMT FROM: Paul Price at IfA,UH R. McNaught (RSAA, ANU) and P.A. Price (IfA, Hawaii) report on behalf of a larger collaboration: We have observed the XRT position of GRB 050401 (Swift trigger 113120) with the 40-inch telescope at Siding Spring Observatory starting at April 1.637 UTC. In an unfiltered exposure of 120 sec, we identify a source near the limiting magnitude of our observations, at approximate coordinates: 16:31:28.81 +02:11:14.2 J2000 This source is within the XRT error circle, and not present in the DSS. The source is about R ~ 20.3 mag. A subsequent image reveals that the source is stationary. Further observations are planned. This message may be cited.