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GCN Circular 5250

BAT Trigger #214277 is SGR 1900+14
2006-06-10T22:09:04Z (18 years ago)
Jay R. Cummings at NASA/GSFC/Swift <>
J. R. Cummings (NASA/ORAU), G. Cusumano (INAF-IASFPA),
V. La Parola (INAF-IASFPA), K. M. McLean (LANL/UTD),
T. Mineo (INAF-IASFPA), G. Sato (GSFC/ISAS),
M. Stamatikos (NASA/ORAU) and E. Troja (INAF-IASFPA) report on behalf
of the Swift Team:

At 06:53:01 UT, the Swift Burst Alert Telescope (BAT) triggered and
located a short soft burst (trigger=214277).  Swift slewed immediately 
to the source. The BAT on-board calculated location is 
RA,Dec 286.791, +9.323 {19h 07m 10s, +09d 19' 22"} (J2000)
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a single weak peak 
with a duration of < 0.032 sec.  The peak count rate was ~1500 counts/sec 
(15-350 keV), at ~0 sec after the trigger. 

As stated in the GCN Notice corresponding to this trigger, the source is
coincident with SGR 1900+14. The short, soft emission is completely
consistent with the previous characteristics of the SGR.  This is the 
first BAT onboard detection of this source since 2006-04-14.

The XRT began taking data at 06:54:50 UT, 110 seconds after the BAT
trigger.  XRT PC data of the first orbit (exposure 2264.7 s) shows
a source at the SGR position with a constant rate of (5.8+/-0.5)E-2 c/s 
consistent with the quiescent state of the source. The source rate
corresponds to an unabsorbed (0.2-10 keV) flux of 
(2.0+/-0.2)E-11 erg cm**-2 s**-1.
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