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arXiv:astro-ph/0004008 (astro-ph)
[Submitted on 3 Apr 2000]

Title:Multiple Sub-Jet Model of Gamma Ray Bursts and Possible Origin of X-ray Precursors and Post-cursors

Authors:Takashi Nakamura (Yukawa Institute for Theoretical Physics)
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Abstract: We assume that internal shocks of Gamma Ray Bursts (GRBs) consist of multiple sub-jets with a collimation half-angle $\sim {\rm several }\times\gamma_i^{-1}$, where $\gamma_i$ is the Lorenz factor of each sub-jet. If by chance a sub-jet is first emitted off-axis from the line of sight, the observed peak energy can be in the X-ray region. Next if by chance a subsequent sub-jet is emitted along the line of sight, then the peak energy will be in the gamma ray region and the gamma ray may arrive after the X-ray precursor from the former sub-jet depending on parameters. This model predicts a new class of GRBs with extremely weak and short gamma ray emission but X-ray precursor and/or post-cursor as well as an afterglow.
Comments: 6 pages, Latex, accepted for publication in Astrophysical Journal Letters
Subjects: Astrophysics (astro-ph)
Report number: YITP-00-14
Cite as: arXiv:astro-ph/0004008
  (or arXiv:astro-ph/0004008v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0004008
Related DOI: https://doi.org/10.1086/312663

Submission history

From: Takashi Nakamura [view email]
[v1] Mon, 3 Apr 2000 06:57:29 UTC (7 KB)
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