"No High Energy Emission" GRB Class Is Attributable to Brightness Bias

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dc.creatorBonnell, J. T.
dc.creatorNorris, J. P.
dc.date1999-05-25
dc.date.accessioned2026-07-07T02:31:42Z
dc.date.available2026-07-07T02:31:42Z
dc.descriptionThe inhomogeneous brightness distribution of BATSE detected gamma-ray bursts has been considered strong evidence for their cosmological origin. However, subclasses of gamma-ray bursts have been shown to have significantly more homogeneous brightness distributions. Pendleton et al. (1997) have found such a result for gamma-ray bursts with no detectable emission at energies >300 keV. Accordingly, it has been suggested that these no high energy (NHE) emission bursts represent an underluminous population of nearby sources. A distinct homogeneous NHE brightness distribution has also been considered as evidence for beaming of different spectral components of the prompt burst emission. We synthesize observed distributions of gamma-ray bursts based on a sample of typical bright BATSE bursts with intrinsic high energy emission and adopt a single cosmological distance scale for all sources. We find that the resulting synthetic NHE bursts do indeed have a more nearly homogeneous intensity distribution when an appropriate decrease in signal to noise and redshifted spectrum is incorporated. We argue that the definition of NHE bursts, and soft-spectrum bursts in general, naturally produces a steep distribution. The NHE class of gamma-ray bursts is therefore likely due to brightness bias.
dc.description13 pages, 4 figures, submitted to ApJ
dc.identifierhttps://arxiv.org/abs/astro-ph/9905319
dc.identifierhttp://arxiv.org/abs/astro-ph/9905319
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/14249
dc.subjectAstrophysics
dc.title"No High Energy Emission" GRB Class Is Attributable to Brightness Bias
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