A Unified Model for Gamma-Ray Bursts
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura, Kenji Toma
Abstract
A possible unified model of short and long gamma-ray bursts (GRBs), X-ray rich GRBs, and X-ray flashes is proposed. It is assumed that the jet of a GRB consists of many emitting sub-shells (i.e., an inhomogeneous jet model). The multiplicity of the sub-shells along a line of sight ns is an important parameter. If ns is large (>>1) the event looks like a long GRB, while if ns=1, the event looks like a short GRB. Finally, when ns=0, the event looks like an X-ray flash or an X-ray rich GRB. Furthermore, our model may also explain the bimodal distributions of T90 duration of BATSE-GRBs. Clearly, our model predicts that short GRBs should be associated with energetic SNe.
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