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Broadband light curve characteristics of GRBs 980425 and 060218 and comparison with long-lag, wide-pulse GRBs
Zhang FW(张富文)1,2,3; Zhang, FW (reprint author), Natl Astron Observ Yunnan Observ, Chinese Acad Sci, POB 110, Kunming 650011, Yunnan, Peoples R China.
发表期刊ASTROPHYSICAL JOURNAL
2008-10-01
卷号685期号:2页码:1052-1062
DOI10.1086/590951
产权排序第1完成单位
收录类别SCI
关键词Gamma Rays : Bursts Methods : Statistical X-rays : Individual (Grb 980425 Grb 060218)
摘要It has been recently argued that low-luminosity gamma-ray bursts (LL-GRBs) are likely a unique GRB population. Here, we present systematic analysis of the light-curve characteristics from X-ray to gamma-ray energy bands for the two prototypical LL-GRBs, 980425 and 060218. It is found that both the pulse width (w) and the ratio of the rising width to the decaying width (r/d) of theses two bursts are energy-dependent over a broad energy band. There exists a significant trend that the pulses tend to be narrower and more symmetrical at higher energy bands for the two events. Both the X-rays and the gamma-rays follow the same w-E and r/d-E relations. These facts may indicate that the X-ray emission tracks the gamma-ray emission, and both are likely to originate from the same physical mechanism. Their light curves show significant spectral lags. We calculate the three types of lags with the pulse peaking time (t(peak)), the pulse centroid time (t(cen)), and the cross-correlation function (CCF). The derived t(peak) and t(cen) are power-law functions of energy. The lag calculated by CCF is strongly correlated with that derived from tpeak. However, the lag derived from tcen correlates less with that derived from tpeak and CCF. The energy dependence of the lags is shallower at higher energy bands. These characteristics are consistent with that observed in typical long-lag, wide-pulse GRBs, suggesting that GRBs 980425 and 060218 may share a similar radiation physics with them.
语种英语
学科领域Astronomy & Astrophysics
文章类型Article
ISSN0004-637X
URL查看原文
归档日期2008-10-07
WOS记录号WOS:000259550300031
WOS研究方向Astronomy & Astrophysics
WOS类目Astronomy & Astrophysics
关键词[WOS]GAMMA-RAY BURSTS ; 25 APRIL 1998 ; SPECTRAL LAGS ; LOW-LUMINOSITY ; X-RAY ; E-P,E-I-E-ISO CORRELATION ; UNUSUAL SUPERNOVA ; NEUTRON-STAR ; JET MODEL ; ENERGY
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被引频次:10[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ynao.ac.cn/handle/114a53/7034
专题星系研究组
通讯作者Zhang, FW (reprint author), Natl Astron Observ Yunnan Observ, Chinese Acad Sci, POB 110, Kunming 650011, Yunnan, Peoples R China.
作者单位1.National Astronomical Observatories/Yunnan Observatory, Chinese Academy of Sciences, P.O. Box 110, Kunming, Yunnan 650011, China
2.Department of Mathematics and Physics, Guilin University of Technology, Guilin, Guangxi 541004, China
3.The Graduate School of the Chinese Academy of Sciences, P.O. Box 3908, Beijing 100039, China
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Zhang FW,Zhang, FW . Broadband light curve characteristics of GRBs 980425 and 060218 and comparison with long-lag, wide-pulse GRBs[J]. ASTROPHYSICAL JOURNAL,2008,685(2):1052-1062.
APA Zhang FW,&Zhang, FW .(2008).Broadband light curve characteristics of GRBs 980425 and 060218 and comparison with long-lag, wide-pulse GRBs.ASTROPHYSICAL JOURNAL,685(2),1052-1062.
MLA Zhang FW,et al."Broadband light curve characteristics of GRBs 980425 and 060218 and comparison with long-lag, wide-pulse GRBs".ASTROPHYSICAL JOURNAL 685.2(2008):1052-1062.
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