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GCN Circular 3623

Subject
Swift/BAT detection of GRB 050716
Date
2005-07-16T13:34:23Z (19 years ago)
From
Evert Rol at U.Leicester <er45@star.le.ac.uk>
E. Rol, C. Hurkett, K. Page (U. Leicester), S. Barthelmy, L. Barbier,
A. Parsons (GSFC), J. Cummings (NRC, GSFC), D. Palmer (LANL),
D. Burrows, J. Kennea (PSU), K. McGowan (MSSL), N. Gehrels (GSFC),
report for the Swift team:


At 12:36:04 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 050716 (trigger=146227).  The BAT on-board calculated
location is RA,Dec 338.598d {+22h 34m 23s}, +38.696d {+38d 41' 46"}
(J2000), with an uncertainty of 4 arcmin (radius, including estimated
systematic uncertainty; 90% containment).  The BAT light curve showed
a multi-peak structure with a duration of at least 40 seconds.  The
15-350 keV peak count rate was ~1300 counts/sec, measured by BAT at
~10 seconds after the trigger.

The spacecraft slewed immediately and the XRT began observing the
burst at 12:37:40 UT (96 seconds after the BAT trigger). The XRT found
a bright, uncatalogued X-ray source. The on board calculated position
is:

RA:     22h 34m 20.4s (J2000),
Dec:   -38d 40' 56.7" (J2000).

This position is 60.6 arcseconds from the BAT position.  The estimated
uncertainty is 6 arcseconds radius (90% containment).


The Swift Ultra Violet/Optical Telescope (UVOT) observations began at
12:37:43 UT, 99 seconds after the BAT trigger. The first data taken
after the spacecraft settled was a 100 sec exposure using the V filter
with the midpoint of the observation at 149 sec after the BAT
trigger. Based on comparisons to the DSS, we detect no new source at
the XRT position.
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