A possible origin of bimodal distribution of gamma-ray bursts

Kenji Toma, Ryo Yamazaki, Takashi Nakamura

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)835-839
Number of pages5
JournalAstrophysical Journal
Issue number2 I
Publication statusPublished - 2005 Feb 20
Externally publishedYes


  • Gamma rays: bursts
  • Gamma rays: theory

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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