TITLE: GCN CIRCULAR NUMBER: 7424 SUBJECT: Swift Trigger 306616 is not a GRB DATE: 08/03/17 23:46:25 GMT FROM: David Palmer at LANL S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), A. P. Beardmore (U Leicester), M. M. Chester (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA), C. B. Markwardt (CRESST/GSFC/UMD), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU), E. Troja (U Leicester/INAF-IASFPA) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: Shortly before 23:31:57 UT, Swift lost star tracker lock. This caused the Burst Alert Telescope (BAT) to detect Sco X-1 at the wrong location, leading to trigger 306616. This is not a GRB. Star tracker recovery operations are in progress.