An off-axis jet model for GRB 980425 and low-energy gamma-ray bursts
Astrophysical Journal Letters Volume 594 Issue 2
Page 2003-10
published_at 2003-09
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| File | |
| Title ( eng ) |
An off-axis jet model for GRB 980425 and low-energy gamma-ray bursts
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| Creator |
Yamazaki Ryo
Yonetoku Daisuke
Nakamura Takashi
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| Source Title |
Astrophysical Journal Letters
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| Volume | 594 |
| Issue | 2 |
| Start Page | 2003 |
| End Page | 10 |
| Abstract |
Using a simple off-axis jet model of gamma-ray bursts (GRBs), we can reproduce the observed unusual properties of the prompt emission of GRB 980425, such as the extremely low isotropic equivalent γ-ray energy, the low peak energy, the high fluence ratio, and the long spectral lag when the jet with the standard energy of ∼1051 ergs and the opening half-angle of 10&j0; ≲ Δ&thetas; ≲ 30&j0; is seen from the off-axis viewing angle &thetas;v ∼ Δ&thetas; + 10γ-1, where γ is a Lorentz factor of the jet. For our adopted fiducial parameters, if the jet that caused GRB 980425 is viewed from the on-axis direction, the intrinsic peak energy Ep(1 + z) is ∼2.0–4.0 MeV, which corresponds to those of GRB 990123 and GRB 021004. We also discuss the connection of GRB 980425 in our model with the X-ray flash, and the origin of a class of GRBs with small Eγ.
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| Keywords |
gamma rays
bursts
theory
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| NDC |
Earth sciences. Geology [ 450 ]
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| Language |
eng
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| Resource Type | journal article |
| Publisher |
University of Chicago Press
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| Date of Issued | 2003-09 |
| Rights |
Copyright (c) 2003 The American Astronomical Society
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| Publish Type | Version of Record |
| Access Rights | open access |
| Source Identifier |
[ISSN] 0004-637X
[DOI] 10.1086/378736
[DOI] http://dx.doi.org/10.1086/378736
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