Swift Identification of Dark Gamma-Ray Bursts

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dc.creatorJakobsson, P.
dc.creatorHjorth, J.
dc.creatorFynbo, J. P. U.
dc.creatorWatson, D.
dc.creatorPedersen, K.
dc.creatorBjornsson, G.
dc.creatorGorosabel, J.
dc.date2004-11-01
dc.date.accessioned2026-07-07T06:18:24Z
dc.date.available2026-07-07T06:18:24Z
dc.descriptionWe present an optical flux vs. X-ray flux diagram for all known gamma-ray bursts (GRBs) for which an X-ray afterglow has been detected. We propose an operational definition of dark bursts as those bursts that are optically subluminous with respect to the fireball model, i.e., which have an optical-to-X-ray spectral index beta_OX < 0.5. Out of a sample of 52 GRBs we identify 5 dark bursts. The definition and diagram serve as a simple and quick diagnostic tool for identifying dark GRBs based on limited information, particularly useful for early and objective identification of dark GRBs observed with the Swift satellite.
dc.description4 pages, 1 figure. ApJ Letters, in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0411036
dc.identifierhttp://arxiv.org/abs/astro-ph/0411036
dc.identifierAstrophys.J. 617 (2004) L21-L24
dc.identifierdoi:10.1086/427089
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/94722
dc.subjectAstrophysics
dc.titleSwift Identification of Dark Gamma-Ray Bursts
dc.typetext

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