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The bulk Lorentz factor of outflow powering X-ray flare in GRB afterglow
Zhi-Ping Jin, Yi-Zhong Fan, Da-Ming Wei
We develop two methods to estimate the bulk Lorentz factor of X-ray flare outflow. In the first method the outflow is assumed to be baryonic and is accelerated by the thermal press…
A Comprehensive Analysis of Fermi Gamma-Ray Burst Data. I. Spectral Components and Their Possible Physical Origins of LAT/GBM GRBs
Bin-Bin Zhang, Bing Zhang, En-Wei Liang +6
We present a systematic analysis of the spectral and temporal properties of 17 GRBs co-detected by GBM and LAT on board the Fermi satellite by May 2010. We performed a time-resolve…
Underlying global features of the x-ray light curves of {\it swift} gamma-ray bursts
Lang Shao, Yi-Zhong Fan, Da-Ming Wei
With its rapid response, {\it Swift} has revealed plenty of unexpected properties of gamma-ray bursts (GRBs). With an abundance of observations, our current understanding is only l…
A Revised Limit of the Lorentz Factors of GRBs with Two Emitting Regions
Yuan-Chuan Zou, Yi-Zhong Fan, Tsvi Piran
Fermi observations of GeV emission from GRBs have suggested that the Lorentz factor of some GRBs is around a thousand or even higher. At the same time the same Fermi observations h…