TITLE: GCN CIRCULAR NUMBER: 6100 SUBJECT: Swift-BAT trigger 260304 is NOT a burst or transient DATE: 07/02/12 20:39:17 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC), S. Immler (GSFC/USRA), J. A. Kennea (PSU), W. B. Landsman (NASA/GSFC), C. B. Markwardt (GSFC/UMD), M. Perri (ASDC) and T. Sakamoto (NASA/ORAU) report on behalf of the Swift Team: The Swift-BAT trigger (260304) at 19:55:34 UT is not a GRB nor is it a transient. The star tracker had momentarily lost lock and the resulting erroneous spacecraft attitude information caused a false trigger.