TITLE: GCN CIRCULAR NUMBER: 14821 SUBJECT: Swift Trigger 557674 is a probable new Galactic transient DATE: 13/06/08 01:04:36 GMT FROM: Jamie A. Kennea at PSU/Swift-XRT J. R. Cummings (NASA/UMBC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), D. Malesani (DARK/NBI) and T. Sakamoto (AGU) report on behalf of the Swift Team: At 00:16:37 UT, the Swift Burst Alert Telescope (BAT) triggered and located a likely new galactic transient source (trigger=557674). The BAT on-board calculated location is RA, Dec 256.064, -37.457 which is RA(J2000) = 17h 04m 15s Dec(J2000) = -37d 27' 24" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The full BAT light curve is not yet available so we cannot say anything about its structure. Since the source is near the galactic plane glon=348.10, glat=+2.36 and is of very long duration (768 seconds), we do not believe that it is a GRB, but rather it is likely to be a new galactic transient. We also note that the source identified in the original GCN alert is more than a degree away from the trigger position, so is most likely not the source of the trigger. Due to an observing constraint, the slew to this target was delayed. We will report on XRT and UVOT observations in a later GCN Circular.