TITLE:   GCN CIRCULAR
NUMBER:  21808
SUBJECT: Swift Trigger on continued activity of MAXI J1535-571
DATE:    17/09/04 14:01:23 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <scott@milkyway.gsfc.nasa.gov>

S. D. Barthelmy (GSFC), A. P. Beardmore (U Leicester),
A. A. Breeveld (UCL-MSSL), J. R. Cummings (NASA/UMBC),
J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester)
and D. M. Palmer (LANL) report on behalf of the Swift Team:

At 13:45:16 UT, the Swift Burst Alert Telescope (BAT) triggered and
located MAXI J1535-571 (trigger=770656).  Swift did not slew due to it being a
known source with a merit value lower than the merit value of the current planned
observing target.  The BAT on-board calculated location is 
RA, Dec 233.825, -57.246, which is 
   RA(J2000)  =  15h 35m 18s
   Dec(J2000) = -57d 14' 45"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  As is typical for image triggers, the real-time 
light curve does not show anything significant.