LATE-TIME DETECTIONS OF THE X-RAY AFTERGLOW OF GRB 060729 WITH CHANDRA-THE LATEST DETECTIONS EVER OF AN X-RAY AFTERGLOW

	LATE-TIME DETECTIONS OF THE X-RAY AFTERGLOW OF GRB 060729 WITH CHANDRA-THE LATEST DETECTIONS EVER OF AN X-RAY AFTERGLOW
	Grupe, Dirk 1; Burrows, David N.1; Wu, Xue-Feng1,2 ; Wang, Xiang-Yu 1,3; Zhang, Bing 4; Liang, En-Wei 5; Garmire, Gordon 1; Nousek, John A.1; Gehrels, Neil 7; Ricker, George R.6
刊名	ASTROPHYSICAL JOURNAL
	2010-03-10
卷号	711 期号:2 页码:1008-1016
关键词	gamma-ray burst: general gamma-ray burst: individual (GRB 060729)
ISSN号	0004-637X
英文摘要	We report on five Chandra observations of the X-ray afterglow of the gamma-ray burst (GRB) 060729 performed between 2007 March and 2008 May. In all five observations, the afterglow is clearly detected. The last Chandra pointing was performed on 2008 May 4, 642 days after the burst-the latest detection of a GRB X-ray afterglow ever. A reanalysis of the Swift XRT light curve together with the three detections by Chandra in 2007 reveals a break at similar to 1.0 Ms after the burst with a slight steepening of the decay slope from alpha = 1.32 to 1.61. This break coincides with a significant hardening of the X-ray spectrum, consistent with a cooling break in the wind medium scenario, in which the cooling frequency of the afterglow crosses the X-ray band. The last two Chandra observations in 2007 December and 2008 May provide evidence for another break at about one year after the burst. If interpreted as a jet break, this late-time break implies a jet half-opening angle of similar to 14 degrees for a wind medium. Alternatively, this final break may have a spectral origin, in which case no jet break has been observed and the half-opening angle of the jet of GRB 060729 must be larger than similar to 15 degrees for a wind medium. We compare the X-ray afterglow of GRB 060729 in a wind environment with other bright X-ray afterglows, in particular GRBs 061121 and 080319B, and discuss why the X-ray afterglow of GRB 060729 is such an exceptionally long-lasting event.
学科主题	Astronomy & Astrophysics
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	SWIFT XRT DATA ; LIGHT CURVES ; BURST AFTERGLOWS ; JET BREAKS ; ENERGY INJECTION ; MASSIVE STARS ; EVOLUTION ; TELESCOPE ; ACCELERATION ; SHOCKS
收录类别	SCI
语种	英语
WOS记录号	WOS:000274848100001
公开日期	2011-11-23
内容类型	期刊论文
源URL	[http://159.226.72.40/handle/332002/1209]
专题	紫金山天文台_南极天文中心
作者单位	1.Penn State Univ, Dept Astron & Astrophys, University Pk, PA 16802 USA 2.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China 3.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China 4.Univ Nevada, Dept Phys, Las Vegas, NV 89154 USA 5.Guangxi Univ, Dept Phys, Nanning 530004, Peoples R China 6.MIT, Cambridge, MA 02139 USA 7.NASA, Goddard Space Flight Ctr, Astroparticle Phys Lab, Astrophys Sci Div, Greenbelt, MD 20771 USA
推荐引用方式 GB/T 7714	Grupe, Dirk,Burrows, David N.,Wu, Xue-Feng,et al. LATE-TIME DETECTIONS OF THE X-RAY AFTERGLOW OF GRB 060729 WITH CHANDRA-THE LATEST DETECTIONS EVER OF AN X-RAY AFTERGLOW[J]. ASTROPHYSICAL JOURNAL,2010,711(2):1008-1016.
APA	Grupe, Dirk.,Burrows, David N..,Wu, Xue-Feng.,Wang, Xiang-Yu.,Zhang, Bing.,...&Bautz, Marshall W..(2010).LATE-TIME DETECTIONS OF THE X-RAY AFTERGLOW OF GRB 060729 WITH CHANDRA-THE LATEST DETECTIONS EVER OF AN X-RAY AFTERGLOW.ASTROPHYSICAL JOURNAL,711(2),1008-1016.
MLA	Grupe, Dirk,et al."LATE-TIME DETECTIONS OF THE X-RAY AFTERGLOW OF GRB 060729 WITH CHANDRA-THE LATEST DETECTIONS EVER OF AN X-RAY AFTERGLOW".ASTROPHYSICAL JOURNAL 711.2(2010):1008-1016.