TITLE: GCN CIRCULAR NUMBER: 19516 SUBJECT: Swift detection of SWIFT J174540.2-290037 DATE: 16/06/10 01:43:20 GMT FROM: Hans Krimm at NASA-GSFC N. Gehrels (NASA/GSFC), H. A. Krimm (CRESST/GSFC/USRA), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 00:50:15 UT, the Swift Burst Alert Telescope (BAT) triggered and located SWIFT J174540.2-290037 (trigger=690226). Swift was already pointed at the source. The BAT on-board calculated location is RA, Dec 266.355, -29.016 which is RA(J2000) = 17h 45m 25s Dec(J2000) = -29d 00' 56" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Since this was a 32-minute image trigger, the BAT light curve does not show any significant features. Since Swift was already pointed at the source, XRT and UVOT data from this time period will be available when it is downlinked through the ground stations. This source is consistent with the source that has triggered BAT three previous times (Barthelmy et al., GCN 19499, 19514, 19515). This is most likely the recently-detected source SWIFT J174540.2-290037, which has continued to brighten in the XRT during routine monitoring (Degenaar et al. Atel #9109).