Swift Identification of Dark Gamma-Ray Bursts
P. JakobssonNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, DenmarkJ. HjorthNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, DenmarkJ. P. U. FynboNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, DenmarkD. WatsonNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, DenmarkK. PedersenNiels Bohr Institute, Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen, DenmarkG. BjörnssonScience Institute, University of Iceland, Dunhaga 3, 107 Reykjavik, IcelandJ. GorosabelInstituto de Astrofisica de Andalucia-CSIC, P.O. Box 03004, E-18080 Granada, Spain
2004en
ABI
Аннотация
We 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.
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