TITLE: GCN CIRCULAR NUMBER: 8583 SUBJECT: Swift Trigger 335971 is probably not a real source DATE: 08/11/30 17:15:12 GMT FROM: Jay R. Cummings at NASA/GSFC/Swift J. Cummings (NASA/GSFC/UMBC), J. Mao (INAF-OAB) on behalf of the Swift science team. Ground analysis of BAT event data from trigger 335971 shows a weak image peak and a weak excess in the light curve on the interval T0 to T+60 sec, 15-50 kev. We cannot confirm nor completely rule out a legitimate source. The best ground-derived position is RA, Dec 324.330, +21.498, which is RA(J2000) = 21h 37m 19.2s Dec(J2000) = +21d 30' 51" with an uncertainty radius of 3 arcmin (90% confidence, stat+sys). XRT data show no sources within the BAT error circle.