TITLE: GCN CIRCULAR NUMBER: 17687 SUBJECT: Swift trigger 637807 is probably not an astrophysical source DATE: 15/04/12 08:57:02 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst D. Malesani (DARK/NBI) and K. L. Page (U Leicester) report on behalf of the Swift Team: At 08:32:10 UT, the Swift Burst Alert Telescope (BAT) imaged a peak with a projected location near XTE J1814-338 (trigger=637807). Due to a visibility constraint, Swift did not slew immediately to the location. The BAT on-board calculated location is RA, Dec = 273.356, -33.940, which is RA(J2000) = 18h 13m 25s Dec(J2000) = -33d 56' 124" with an uncertainty of 4 arcmin (radius, 90% containment, including systematic uncertainty). As is usual for image triggers, there is no significant variation in the immediately available BAT lightcurve. Given the very low significance of the trigger (5.87 sigma), and that the BAT position is more than 10 arcmin away from the known position of XTE J1814-338, we do not believe that the trigger is associated with XTE J1814-338 and it is unlikely to have been caused by a real astrophysical source.