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GCN Circular 19515

Subject

Swift detection of SWIFT J174540.2-290037

Date

2016-06-09T20:54:20Z (9 years ago)

From

Scott Barthelmy at NASA/GSFC <scott@milkyway.gsfc.nasa.gov>

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 19499Loading...
 
 ) and then again earlier today 
(Barthelmy et al., GCN 19514Loading...
 
 ).  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.