GCN Circular 33202

J.D. Gropp (PSU), J. A. Kennea (PSU),
N. J. Klingler (GSFC/UMBC/CRESSTII), A. Y. Lien (U Tampa) and
D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift
Observatory Team:

At 05:44:17 UT, the Swift Burst Alert Telescope (BAT) triggered and
located the known source LS V +44 17 (trigger=1150107).  Swift slewed
immediately to the location. 
The BAT on-board calculated location is 
RA, Dec 70.267, +44.525 which is 
   RA(J2000) = 04h 41m 04s
   Dec(J2000) = +44d 31' 30"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  As is typical for an image trigger,
the flux from the source is difficult to distinguish from
background in the immediately available lightcurve. 

The XRT began observing the field at 05:46:13.8 UT, 116.5 seconds after
the BAT trigger. XRT found a bright X-ray source located at RA, Dec
70.2493, 44.5309 which is equivalent to:
   RA(J2000)  = 04h 40m 59.83s
   Dec(J2000) = +44d 31' 51.2"
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This
location is 50 arcseconds from the BAT onboard position, within the BAT
error circle. This position is 6.8 arcseconds from a known X-ray
source: LS V +44 17. 

LS V +44 17 has been recently reported to be on the rise, e.g. ATEL
#15868. 

The long term lightcurve can be seen on the BAT Transient
Analysis page for this source and shows that the outburst
is still increasing after an initial peak and decline. 
https://swift.gsfc.nasa.gov/results/transients/weak/LSVp4417/
(The bottom plot on that page shows the 2010 peak.  The current
outburst is the plot above it, shown in blue.)