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Time lag between prompt optical emission and gamma-rays in GRBs (Research Note)
Tang, SM; Zhang SN(张双南); Zhang, SN
2006
发表期刊ASTRONOMY & ASTROPHYSICS
卷号456期号:1页码:#REF!
通讯作者Tang, SM (reprint author), Tsing Hua Univ, Dept Phys, Beijing 100084, Peoples R China.
文章类型Article
摘要Aims. The prompt optical emission contemporaneous with the gamma-rays from gamma-ray bursts (GRBs) carries important information on the central engine and explosion mechanism. We study the time lag between prompt optical emission and gamma-rays in GRB 990123 and GRB 041219a, which are the only two GRBs detected at optical wavelengths during the ascending burst phase. Methods. Assuming profiles of prompt optical light curves are the same as the prompt gamma-rays, we simulate optical light curves with different time lags and compare them with the observed optical flux. Then the best fit time lag and its error are determined by chi-squared values. Results. We find that time lags between prompt optical emission and gamma-rays in GRB host galaxy rest-frames are consistent in the two GRBs, which is 5 similar to 7 s for GRB 990123 and 1 similar to 5 s for GRB 041219a. This result is consistent with a common origin of prompt optical and gamma-ray emissions in the two GRBs. Based on synchrotron cooling model, we also derive the parameters for the two GRBs.
关键词gamma rays : bursts methods : data analysis
学科领域Astronomy & Astrophysics
DOI10.1051/0004-6361:20065547
收录类别SCI
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000240009800013
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被引频次:6[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226462
专题粒子天体物理中心
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Tang, SM,Zhang SN,Zhang, SN. Time lag between prompt optical emission and gamma-rays in GRBs (Research Note)[J]. ASTRONOMY & ASTROPHYSICS,2006,456(1):#REF!.
APA Tang, SM,张双南,&Zhang, SN.(2006).Time lag between prompt optical emission and gamma-rays in GRBs (Research Note).ASTRONOMY & ASTROPHYSICS,456(1),#REF!.
MLA Tang, SM,et al."Time lag between prompt optical emission and gamma-rays in GRBs (Research Note)".ASTRONOMY & ASTROPHYSICS 456.1(2006):#REF!.
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