TITLE: GCN CIRCULAR NUMBER: 3185 SUBJECT: GRB 050406: Magellan optical observations DATE: 05/04/07 00:36:33 GMT FROM: Edo Berger at Carnegie Obs Edo Berger, Gus Oemler, and Mike Gladders (Carnegie Observatories) report: "On 2005, April 6.99 UT we imaged the position of GRB 050406 (GCN 3180) with LDSS-3 on the Magellan/Clay telescope in the r-band and i-band. Within the 5" radius XRT error circle (GCN 3184) we find a single faint source (r~22 mag) close to the detection threshold of both images. The position of this object is (J2000): RA = 02:17:52.3 DEC= -50:11:15 with an uncertainty of about 0.5" in each coordinate. At the present we cannot confirm whether the object has faded."