X-Ray Afterglows of GRBs 050318 and 060124 and their External Shock Origin

作     者：Jin Zhang Yi-Ping Qin Fu-Wen Zhang Bin-Bin Zhang 

作者机构：National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming 650011 Center for Astrophysics of Guangzhou University Guangzhou 510006 Physics Department Guangxi University Nanning 530004 Graduate School of Chinese Academy of Sciences Beijing 100049 

出 版 物：《Chinese Journal of Astronomy and Astrophysics》 (中国天文和天体物理学报（英文版）)

年 卷 期：2007年第7卷第4期

页      面：516-520页

核心收录：

学科分类：0709[理学-地质学] 07[理学] 0708[理学-地球物理学] 070401[理学-天体物理] 0825[工学-航空宇航科学与技术] 0704[理学-天文学] 

基　　金：the National Natural Science Foundation of China 

主　　题：gamma-rays- bursts-individual: GRB 050318 GRB 060124 

摘      要：The observations with Swift X-ray telescope （XRT） challenge the conventional gamma-ray burst model in many aspects. The XRT light curves are generally composed of four consecutive segments, i.e., a steep decay segment, a shallow decay segment, a normal decay segment, a jet-like steep decay segment, and sometimes erratic flares as well. The physical origin of the X-ray emission is highly debatable. We focus here on the physical origin of the X-ray emissions of GRBs 050318 and 060124. We present the XRT light curves and spectra of the two bursts. The light curve decay slopes of the two bursts are normal, and their relations to the spectral indices are consistent with the prediction of the standard forward shock model. The multi-wavelength light curves at 0.5 keV, 1.0 keV, 2.0 keV and 4.0 keV can be reproduced by this model with an isotropic kinetic energy Ek = 2.2 × 10^52 erg, εe = 0.04, εB = 0.01 for GRB 050318 and Ek = 4.2 × 10^53 erg, εe = 0.05, εB = 0.01 for GRB 060124. These facts suggest that the normal decay phases of the X-rays for the two bursts are of the forward shock origin.