منابع مشابه
The Detectability of Orphan Afterglows
The realization that GRBs release a constant amount of energy implies that the post jet-break afterglow evolution would be largely universal. For a given redshift all afterglows should be detected up to a fixed observer angle. We estimate the observed magnitude and the implied detectability of orphan afterglows. We show that for reasonable limiting magnitudes (mlim = 25) orphan afterglows would...
متن کاملEstimation of the detectability of optical orphan afterglows
Considering two main assumptions: no sideways expansion and the distribution of half-opening angle of jetted ejecta of gamma-ray bursts, we estimate the detectability of optical orphan afterglows. We show that the former assumption leads to more orphans to be detected while the latter greatly depresses the detectability compared with one single opening angle θj = 0.1 model. We also consider the...
متن کاملOn-Axis Orphan Afterglows
On axis orphan afterglows are afterglows with no preceding γ-ray emission that arise within the initial GRB jet. This could happen if the GRB and afterglow emission are beamed differently in different wavelengths, as would be the case if the relativistic Lorentz factors varies strongly with angle within GRB jets. We show that the observations of the WFC on BeppoSAX constrain with high certainty...
متن کاملFailed gamma-ray bursts and orphan afterglows
It is believed that orphan afterglow searches can help to measure the beaming angle in gamma-ray bursts (GRBs). Great expectations have been put on this method. We point out that the method is in fact not as simple as we originally expected. Due to the baryon-rich environment that is common to almost all popular progenitor models, there should be many failed gamma-ray bursts, i.e., fireballs wi...
متن کاملBeaming Effects in GRBs and Orphan Afterglows
The overall dynamical evolution and radiation mechanism of γ-ray burst jets are briefly introduced. Various interesting topics concerning beaming in γ-ray bursts are discussed, including jet structures, orphan afterglows and cylindrical jets. The possible connection between γ-ray bursts and neutron stars is also addressed.
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2002
ISSN: 0004-637X,1538-4357
DOI: 10.1086/342791