Liu, Xue-Wen, Wu, Xue-Feng, Zou, Yuan-Chuan, Lu, Tan
In the fireball model, it is more physically realistic that gamma-ray burst (GRB) ejecta have a range of bulk Lorentz factors (assuming $M\propto \Gamma^{-s}$). The low Lorentz factor part of the...
Lorentz Factor Constraint from the very early external shock of the gamma-ray burst ejecta (2009)
While it is generally agreed that the emitting regions in Gamma-Ray Bursts (GRBs) move ultra relativistically towards the observer, different estimates of the initial Lorentz factors, $\Gamma_0$,...
Observational limits on inverse Compton processes in gamma-ray bursts (2009)
Piran, Tsvi, Sari, Re'em, Zou, Yuan-Chuan
Inverse Compton (IC) scattering is one of two viable mechanisms that can produce prompt non-thermal soft gamma-ray emission in gamma-ray bursts. IC requires low-energy seed photons and a population...
Clues from the Prompt Emission of GRB 080319B (2009)
Zou, Yuan-Chuan, Piran, Tsvi, Sari, Re'em
The extremely bright optical flash that accompanied GRB 080319B suggested, at first glance, that the prompt γ-rays in this burst were produced by synchrotron self-Compton (SSC). We analyze here the...
Zou, Yuan-Chuan, Fan, Yi-Zhong, Piran, Tsvi
We calculate the high energy (sub-GeV to TeV) prompt and afterglow emission of GRB 080319B that was distinguished by a naked-eye optical flash and by an unusual strong early X-ray afterglow. There...
Observational Limits on Inverse Compton Processes in GRBs (2008)
Piran, Tsvi, Sari, Re'em, Zou, Yuan-Chuan
Inverse Compton (IC) scattering is one of two viable mechanisms that can produce the prompt gamma-ray emission in Gamma-Ray Bursts. IC requires low energy seed photons and a population of...
Lei, Wei-Hua, Wang, Ding-Xiong, Zou, Yuan-Chuan, Zhang, Lei
We propose a three-stage model with Blandford-Znajek (BZ) and hyperaccretion process to interpret the recent observations of early afterglows of Gamma-Ray Bursts (GRBs). In the first stage, the...
Xu, Dong, Zou, Yuan-Chuan, Fan, Yi-Zhong
We analyze the hitherto available space-based X-ray data as well as ground-based optical data of the X-ray transient 080109/SN2008D. From the data we suggest that (i) The initial transient (\lesssim...