TITLE: GCN CIRCULAR NUMBER: 19515 SUBJECT: Swift detection of SWIFT J174540.2-290037 DATE: 16/06/09 20:54:20 GMT FROM: Scott Barthelmy at NASA/GSFC S. D. Barthelmy (GSFC), N. Gehrels (NASA/GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (CRESST/GSFC/USRA), C. B. Markwardt (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team: At 20:27:59 UT, the Swift Burst Alert Telescope (BAT) triggered and located the new source SWIFT J174540.2-290037 (trigger=690197). Swift did not slew due an observing constraint. The BAT on-board calculated location is RA, Dec 266.391, -28.980, which is RA(J2000) = 17h 45m 34s Dec(J2000) = -28d 58' 48" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image triggers, the real-time TDRSS data does not show anything significant. This source is presumably the same as the source that triggered 2.5 days earlier (Barthelmy et al., GCN 19499) and then again earlier today (Barthelmy et al., GCN 19514). 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). XRT and UVOT data for this trigger are expected at around 22:00 UT.