TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3773 SUBJECT: Swift-BAT trigger 149118 is very likely not a GRB DATE: 05/08/06 02:34:36 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. Cummings (GSFC/NRC), S. Barthelmy (GSFC), D. Burrows (PSU), M. Chester (PSU), N. Gehrels (GSFC), M Goad (U. Leicester), O. Godet (U. Leicester), J. Kennea (PSU), A. Morgan (PSU), C. Pagani (PSU), D. Palmer (LANL) on behalf of the Swift team: The Swift-BAT trigger (trigger=149118) at 18:04:00 UT on 05 Aug 2005 is very likely not a GRB. At the time of the trigger there is only a weak excess in the lightcurve and a very weak excess in the image data. Ground analysis of the XRT data does not show any X-ray source within the BAT error circle in 2.2ks of accumulated observations. We therefore conclude from the XRT data that Trigger 149118 is very likely not a GRB.