Other
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1133..163g&link_type=abstract
GAMMA-RAY BURST: Sixth Huntsville Symposium. AIP Conference Proceedings, Volume 1133, pp. 163-168 (2009).
Other
Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray Binaries, Plasma Reactions
Scientific paper
The X-ray afterglow of GRB 060729 had the latest detection of an X-ray afterglow ever, at 640 days after the burst. It was detected by Swift up to 125 days after the trigger and later by Chandra with follow-up observations in 2007 and 2008 with the latest observations in May 2008. These observations indicate two breaks in the X-ray light curve of the afterglow at about 1 Ms and one year after the burst respectively. The first break at 1.2 Ms after the burst coincides with a hardening in the X-ray spectrum. The second break at about one year after the burst is followed by a very steep decay of Fx~t-4.59 and coincides with a spectral softening. The first break can be interpreted as a cooling break in the wind medium scenario, at which the cooling frequency of the x-ray afterglow just crosses the x-ray band, while the second break is less well-understood. Based on these interpretations, we estimated a jet half opening angle of >=14°. A comparison with other bright X-ray afterglows shows that GRB 060729 has been one of the most energetic bursts ever seen with a total beaming-corrected energy in the rest-frame 2-10 keV band of E2-10 keV>=2.1×1051 ergs.
Burrows David
Garmire Gordon
Grupe Dirk
Wang Xiang-Yu
Wu Xue-Feng
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