Swift Identification of Dark Gamma-Ray Bursts | Zendy

P. Jakobsson | Zendy; J. Hjorth | Zendy; J. P. U. Fynbo | Zendy; D. Watson | Zendy; K. Pedersen | Zendy; G. Björnsson | Zendy; J. Gorosabel | Zendy

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Swift Identification of Dark Gamma-Ray Bursts

Author(s) -

P. Jakobsson,

J. Hjorth,

J. P. U. Fynbo,

D. Watson,

K. Pedersen,

G. Björnsson,

J. Gorosabel

Publication year - 2004

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/427089

Subject(s) - afterglow , physics , swift , astrophysics , gamma ray burst , flux (metallurgy) , diagram , astronomy , computer science , materials science , metallurgy , database

We present an optical flux vs. X-ray flux diagram for all known gamma-raybursts (GRBs) for which an X-ray afterglow has been detected. We propose anoperational definition of dark bursts as those bursts that are opticallysubluminous with respect to the fireball model, i.e., which have anoptical-to-X-ray spectral index beta_OX < 0.5. Out of a sample of 52 GRBs weidentify 5 dark bursts. The definition and diagram serve as a simple and quickdiagnostic tool for identifying dark GRBs based on limited information,particularly useful for early and objective identification of dark GRBsobserved with the Swift satellite.Comment: 4 pages, 1 figure. ApJ Letters, in pres

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