The early optical afterglow and non-thermal components of GRB 060218
The early optical afterglow and non-thermal components of GRB 060218
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DOI：
10.1093/mnras/stz373
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发表时间：
2019-02
影响因子：
4.8
通讯作者：
S. Emery;M. Page;A. Breeveld;P. J. Brown;N. Kuin;S. Oates;M. De Pasquale-M.-De Pasquale-2126433425
中科院分区：
文献类型：
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作者：
S. Emery;M. Page;A. Breeveld;P. J. Brown;N. Kuin;S. Oates;M. De Pasquale-M.-De Pasquale-2126433425
我们重新检查了GRB 060218在提示和余辉阶段的紫外/光学和x射线观测。我们在紫外/光学光谱中提供了证据，表明在最初的1350s中有一个同步加速器成分对观测到的通量有贡献。这一结果表明GRB 060218是由低光度射流产生的，该射流在核心坍缩后穿透了其祖包层。射流与周围介质相互作用产生紫外/光学外部激波同步辐射。1350s之后，紫外/光学和x射线中的热辐射成为观测通量的主要贡献。1350-10 000 s的紫外/光学光谱和x射线光谱可以用一个球向外流黑体模型拟合，在x射线能量下，该模型具有额外的幂律分量。
We re-examine the UV/optical and X-ray observations of GRB 060218 during the prompt and afterglow phases. We present evidence in the UV/optical spectra that there is a synchrotron component contributing to the observed flux in the initial 1350 s. This result suggests that GRB 060218is producedfrom alow-luminosityjet, whichpenetrates throughits progenitor envelope after core collapse. The jet interacts with the surrounding medium to generate the UV/optical external shock synchrotron emission. After 1350 s, the thermal radiation in the UV/optical and X-ray becomes the dominant contribution to the observed flux. The UV/optical and X-ray spectra at 1350–10 000 s can be fitted with a spherically outflowing blackbody model, with an additional power-law component to the model at X-ray energies.