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ID 14646
file
creator
Toma, Kenji
Yamazaki, Ryo
Nakamura, Takashi
NDC
Astronomy. Space sciences
abstract
We study the distribution of the durations of gamma-ray bursts (GRBs) in the unified model of short and long GRBs recently proposed by Yamazaki, Ioka, and Nakamura. Monte Carlo simulations show clear bimodal distributions, with lognormal- like shapes for both short and long GRBs, in a power-law as well as a Gaussian angular distribution of the subjets. We find that the bimodality comes from the existence of the discrete emission regions ( subjets or patchy shells) in the GRB jet. To explain other temporal properties of short and long GRBs, the subjet parameters should depend on the angle in the whole jet.
journal title
Astrophysical Journal
volume
Volume 620
issue
Issue 2
start page
835
end page
839
date of issued
2005-02
publisher
University of Chicago Press
issn
0004-637X
publisher doi
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2005 The American Astronomical Society
relation url
department
Graduate School of Science