A Unified Model of Short and Long Gamma-Ray Bursts, X-Rayndashrich Gamma-Ray Bursts, and X-Ray Flashes
Ryo YamazakiDepartment of Physics, Kyoto University, Kyoto 606-8502, JapanKunihito IokaDepartment of Earth and Space Science, Osaka University, Toyonaka 560-0043, JapanTakashi NakamuraDepartment of Physics, Kyoto University, Kyoto 606-8502, Japan
2014en
ABI
Abstract
Taking into account the recent suggestion that a short gamma-ray burst (GRB) looks like the first 1 s of a long GRB, we propose that the jet of a GRB consists of multiple subjets or subshells (i.e., an inhomogeneous jet model). The multiplicity of the subjets along a line of sight n(s) is an important parameter. If n(s) is large (much greater than1) the event looks like a long GRB, while if n(s) is small (similar to1) the event looks like a short GRB. If our line of sight is off-axis to any subjets, the event looks like an X-ray flash or an X-ray-rich GRB. The lognormal distribution of durations of short and long GRBs are also suggested in the same model.
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