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GCN Circular 3264

Subject
Swift BAT/XRT Detection of GRB 050416
Date
2005-04-16T11:50:53Z (19 years ago)
From
Takanori Sakamoto at NASA/GSFC <takanori@milkyway.gsfc.nasa.gov>
T. Sakamoto (GSFC/NRC), L. Barbier (GSFC), S. Barthelmy (GSFC), 
D. Burrows (PSU), M. Chester (PSU), J. Cummings (GSFC/NRC), 
E. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD), 
J. Kennea (PSU) , H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), 
D. Palmer (LANL), A. Parsons (GSFC), G. Sato (ISAS), M. Suzuki (Saitama),
M. Tripicco (GSFC-SSAI), J. Tueller (GSFC), D. Burrows (PSU),
on behalf of the Swift team:

At 11:04:44.5 UT, the Swift Burst Alert Telescope (BAT) triggered and 
located on-board GRB050416 (trigger #114753).  The BAT on-board 
calculated location is RA, dec 188.478, 21.043 (J2000) with an 
uncertainty of 3.00 arcmin (radius, 3-sigma, including estimated 
systematic uncertainty). The BAT light curve shows double 
structures with a duration of about three seconds. The peak 
count rate measured by BAT was about 3000 counts/sec in the 15 -
350 keV band.  The burst signal is mostly seen in 15-50 keV.  

The XRT observed the target field at 11:06:12 UT and detected 17 counts in  
a single CCD frame, just under the number needed for a reliable on-board  
centroid.  Initial indications based on the raw spectra and lightcurve  
transmitted via TDRSS suggest that there is a real X-ray source in the  
field.  We will issue an update following the next ground station pass at  
12:18 UT.
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