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arXiv 0908.2850astro-ph.HE
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模拟GRB 980703的射电和光学/近红外余辉:数值研究

Modeling the radio and optical/NIR afterglows of GRB 980703: a numerical study

S. W. Kong, Y. F. Huang, K. S. Cheng, T. Lu

摘要:

GRB 980703有大量的多波段余辉数据。特别是,它的射电余辉非常明亮,一直被监测到触发时间后的1000多天。此外,没有明显的特殊性,即,在多波段余辉光变曲线中没有再亮、没有平台、并且没有特殊的陡峭衰减或缓慢衰减。这些条件使GRB 980703成为研究伽马射线暴的珍贵样品。本文利用GRB 980703的观测数据对标准火球模型进行了深入检验。结果表明,该模型能较好地解释多波段和全余辉光变曲线。GRB 980703的辐射角约为0.23弧度,环爆介质密度约为27 cm-3。喷出物的总各向同性等效动能为~ 3.8E ~(52)尔格。还导出了宿主星系的静止坐标系消光为Av ~ 2.5等。

英文摘要:

Extensive multi-band afterglow data are available for GRB 980703. Especially, its radio afterglow was very bright and was monitored until more than 1000 days after the trigger time. Additionally, there is no obvious special feature, i.e., no rebrightenings, no plateau, and no special steep decay or slow decay in the multi-band afterglow light curves. All these conditions make GRB 980703 a precious sample in gamma-ray burst research. Here we use the observational data of GRB 980703 to test the standard fireball model in depth. It is found that the model can give a satisfactory explanation to the multi-band and overall afterglow light curves. The beaming angle of GRB 980703 is derived as ~0.23 radian, and the circum-burst medium density is ~ 27 cm-3. The total isotropic equivalent kinetic energy of the ejecta is ~ 3.8E52 ergs. A rest-frame extinction of Av ~ 2.5 mag in the host galaxy is also derived.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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