JET BREAKS AND ENERGETICS OF Swift GAMMA-RAY BURST X-RAY AFTERGLOWS

JET BREAKS AND ENERGETICS OF Swift GAMMA-RAY BURST X-RAY AFTERGLOWS
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快速伽马射线暴 X 射线余辉的喷射破裂和能量

DOI:
10.1088/0004-637x/698/1/43
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发表时间:
2008-12
影响因子:
4.9
通讯作者:
Racusin, J. L.
Racusin, J. L.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Evans, P.;Sakamoto, T.;Falcone, A.;Osborne, J.;Liang, E. W.;Zhang, B. B.;Zhang, B.;Burrows, D. N.;Racusin, J. L.

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我们提出了一个系统的时间和光谱研究的所有斯威夫特X射线望远镜观测的伽马射线暴(GRB)余辉发现2005年1月至2007年12月。在构建和拟合所有的光变曲线和光谱的幂律模型,我们分类的组件,每个余辉的正则X射线余辉和测试它们对封闭关系的前向冲击波模型的各种参数组合。闭合关系用于识别潜在的射流中断,其特征包括具有和不具有横向扩散和能量注入的均匀射流模型,以及幂律结构化射流模型,所有这些都具有一系列参数。通过这种技术,我们调查了X射线余辉,有强有力的证据表明喷流断裂(占我们样本的12%),并揭示了潜在的喷流断裂的情况下,不明显出现单独的光变曲线(另一个30%),导致洞察到失踪的喷流断裂问题。探索那些不显示断裂或具有与射流模型之一不一致的断裂的X射线光变曲线,以限制看不见的射流断裂的时间。喷气式飞机休息时间的分布范围从几个小时到几周不等,中位数为101天,与雨燕之前的发现相似。平均而言,雨燕伽玛暴具有较低的各向同性等效γ射线能量,这反过来又导致较低的准直校正的γ射线能量比雨燕前伽玛暴。最后,我们探讨伽玛暴喷流的几何形状和能量的影响。
We present a systematic temporal and spectral study of all Swift-X-ray Telescope observations of gamma-ray burst (GRB) afterglows discovered between 2005 January and 2007 December. After constructing and fitting all light curves and spectra to power-law models, we classify the components of each afterglow in terms of the canonical X-ray afterglow and test them against the closure relations of the forward shock models for a variety of parameter combinations. The closure relations are used to identify potential jet breaks with characteristics including the uniform jet model with and without lateral spreading and energy injection, and a power-law structured jet model, all with a range of parameters. With this technique, we survey the X-ray afterglows with strong evidence for jet breaks (∼12% of our sample), and reveal cases of potential jet breaks that do not appear plainly from the light curve alone (another ∼30%), leading to insight into the missing jet break problem. Those X-ray light curves that do not show breaks or have breaks that are not consistent with one of the jet models are explored to place limits on the times of unseen jet breaks. The distribution of jet break times ranges from a few hours to a few weeks with a median of ∼1 day, similar to what was found pre-Swift. On average, Swift GRBs have lower isotropic equivalent γ-ray energies, which in turn result in lower collimation corrected γ-ray energies than those of pre-Swift GRBs. Finally, we explore the implications for GRB jet geometry and energetics.
DOI: --
发表时间: 2006
期刊: --
影响因子: --
作者:
S. Cenko;E. Berger;S. Djorgovski;A. Mahabal;D. Fox
通讯作者: S. Cenko;E. Berger;S. Djorgovski;A. Mahabal;D. Fox
DOI: 10.1051/0004-6361:20053950
发表时间: 2005-07
影响因子: 6.5
作者:
M. Pasquale;L. Piro;B. Gendre;L. Amati;L. A. Antonelli;E. Costa;M. Feroci;F. Frontera;L. Nicastro;P. Soffitta;J. I. Z. Inaf;Iasf Rome;Italy.;-INAF;Iasf Bologna;R. Observatory;U. Ferrara;Sron;Utrecht;Netherlands.;I. Palermo
通讯作者: M. Pasquale;L. Piro;B. Gendre;L. Amati;L. A. Antonelli;E. Costa;M. Feroci;F. Frontera;L. Nicastro;P. Soffitta;J. I. Z. Inaf;Iasf Rome;Italy.;-INAF;Iasf Bologna;R. Observatory;U. Ferrara;Sron;Utrecht;Netherlands.;I. Palermo
DOI: 10.1086/320255
发表时间: 2000-11
期刊: The Astrophysical Journal Letters
影响因子: --
作者:
Bing Zhang;P. Mészáros
通讯作者: Bing Zhang;P. Mészáros
DOI: --
发表时间: 2001
期刊: --
影响因子: --
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DOI: 10.1086/586693
发表时间: 2007-07
期刊: The Astrophysical Journal
影响因子: --
作者:
D. Kocevski;N. Butler
通讯作者: D. Kocevski;N. Butler