TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3572 SUBJECT: GRB 050709: LCO40 Observations DATE: 05/07/11 14:39:21 GMT FROM: S. Bradley Cenko at Caltech S. Bradley Cenko, Derek B. Fox (Caltech), Edo Berger (Carnegie), and Brian Lee (Toronto) report on behalf of the Caltech-NRAO-Carnegie collaboration: We have have obtained two epochs of imaging of the field of GRB 050709 (GCN 3570) with the 40-inch Swope telescope at Las Campanas Observatory. Both epochs consisted of 3 x 600 sec images in the Sloan i' filter. The time of the first epoch was approximately 11 July 2005 4:15 UT (~ 29.6 hours after the burst), while the second epoch was taken 6.3 hours later. Image subtraction of the two epochs reveals no variables sources to a limiting magnitude of i' < 20.3 (estimated by comparison with several USNO-B stars in the field).