LIMITS ON OPTICAL POLARIZATION DURING THE PROMPT PHASE OF GRB 140430A-猫眼课题宝

DOI：

10.1088/0004-637x/813/1/1

发表时间：

2015-09

期刊：

The Astrophysical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

D. Kopač;C. Mundell;C. Mundell;J. Japelj;D. Arnold;I. Steele;C. Guidorzi;S. Dichiara;S. Kobayashi;A. Gomboc;R. Harrison;G. Lamb;A. Melandri;Robert J. Smith;F. Virgili;A. Castro-Tirado;A. Castro-Tirado;J. Gorosabel;A. Jarvinen;R. Sánchez-Ramírez;S. Oates;Martin Jelínek

伽马射线暴GRB 140430 A被雨燕卫星探测到，并被安装在利物浦望远镜上的成像偏振计RINGO 3及时观测到，观测开始时，即时γ射线发射仍在进行中。在本文中，我们提出了密集采样（10秒的时间分辨率）的早期光学光变曲线（LC）在3个光学波段和限制的光学偏振度。我们比较了光学，X射线和伽马射线的特性，并提出了一个分析的光发射期间的高能量耀斑。复杂的光学LC不能仅仅用来自标准外部冲击的正向和反向冲击发射的组合来解释，这意味着来自内部冲击耗散的发射的额外贡献。我们估计在瞬发相期间的时间平均光学偏振的上限低至P < 12%（1σ）。这表明，在这个伽玛暴的光学耀斑和早期余辉发射不是高度偏振的。可替代地，时间平均可以掩盖在不同偏振位置角处的不同来源的另外偏振分量的存在。

Gamma-ray burst GRB 140430A was detected by the Swift satellite and observed promptly with the imaging polarimeter RINGO3 mounted on the Liverpool Telescope, with observations beginning while the prompt γ-ray emission was still ongoing. In this paper, we present densely sampled (10-s temporal resolution) early optical light curves (LCs) in 3 optical bands and limits to the degree of optical polarization. We compare optical, X-ray, and gamma-ray properties and present an analysis of the optical emission during a period of high-energy flaring. The complex optical LC cannot be explained merely with a combination of forward and reverse shock emission from a standard external shock, implying additional contribution of emission from internal shock dissipation. We estimate an upper limit for time averaged optical polarization during the prompt phase to be as low as P < 12% (1σ). This suggests that the optical flares and early afterglow emission in this GRB are not highly polarized. Alternatively, time averaging could mask the presence of otherwise polarized components of distinct origin at different polarization position angles.

LIMITS ON OPTICAL POLARIZATION DURING THE PROMPT PHASE OF GRB 140430A

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