Description of Atypical Bursts Seen Slightly Off-axis
Description of Atypical Bursts Seen Slightly Off-axis
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DOI：
10.3847/1538-4357/ab88b7
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发表时间：
2019-06
期刊：
影响因子：
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通讯作者：
N. Fraija;F. Colle;P. Veres;S. Dichiara;R. Duran;A. Pedreira;A. Galván-Gámez;B. B. Kamenetskaia-B.
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文献类型：
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作者：
N. Fraija;F. Colle;P. Veres;S. Dichiara;R. Duran;A. Pedreira;A. Galván-Gámez;B. B. Kamenetskaia-B.
在伽马射线暴GRB 170817 A中，引力波和电磁波的探测标志着多信使天文学的新时代。已经提出了几个理论模型来解释这一事件的非典型行为。最近，它被证明th0at的多波长余辉的GRB 170817 A是一致的同步加速器前向激波模型时，外流被视为离轴，在均匀介质中减速，并通过幂律速度分布参数化。受极高能量发射的上限以及为解释短GRB 150101 B中的伽马射线通量而提出的中子星星合并附近的分层介质的启发，我们将GRB 170817 A的解释机制扩展到一个更一般的情况，导出了同步加速器自康普顿和同步加速器前向激波模型，轴向出流在均匀分层的环爆流密度下减速。作为特殊的情况下，我们表明，在GRB 080503，GRB 140903A，GRB 150101B和GRB 160821B中观察到的延迟和持久的余辉发射可以解释为一个类似的场景用来描述GRB 170817A。此外，我们表明，所提出的方案同意主要大气伽玛射线成像切伦科夫望远镜，费米大面积望远镜，和高能立体系统的伽玛射线辐射的GRB 160821 B和GRB 170817 A的上限。
The detection of gravitational waves together with their electromagnetic counterpart, in the gamma-ray burst GRB 170817A, marked a new era of multi-messenger astronomy. Several theoretical models have been proposed to explain the atypical behavior of this event. Recently, it was shown th0at the multiwavelength afterglow of GRB 170817A was consistent with a synchrotron forward-shock model when the outflow was viewed off-axis, decelerated in a uniform medium and parameterized through a power-law velocity distribution. Motivated by the upper limits on the very high-energy emission, and the stratified medium in the close vicinity of a binary neutron star merger proposed to explain the gamma-ray flux in the short GRB 150101B, we extend the mechanism proposed to explain GRB 170817A to a more general scenario deriving the synchrotron self-Compton and synchrotron forward-shock model when the off-axis outflow is decelerated in a uniform and stratified circumburst density. As particular cases, we show that the delayed and long-lasting afterglow emission observed in GRB 080503, GRB 140903A, GRB 150101B, and GRB 160821B could be interpreted by a scenario similar to the one used to describe GRB 170817A. In addition, we show that the proposed scenario agrees with the Major Atmospheric Gamma-ray Imaging Cherenkov telescope, Fermi-Large Area Telescope, and High Energy Stereoscopic System upper limits on gamma-ray emission from GRB 160821B and GRB 170817A.