Optical Classification of Gamma-Ray Bursts in the Swift Era

Details Optical Classification of Gamma-Ray Bursts in the Swift Era Optical Classification of Gamma-Ray Bursts in the Swift Era

2009-05-05

arxiv.org/abs/0905.0524v1

Astrophys.J.699:1087-1091,2009

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 3 figures; accepted for publication in ApJ

Scientific paper

10.1088/0004-637X/699/2/1087

We propose a new method for the classification of optically dark gamma-ray bursts (GRBs), based on the X-ray and optical-to-X-ray spectral indices of GRB afterglows, and utilizing the spectral capabilities of Swift. This method depends less on model assumptions than previous methods, and can be used as a quick diagnostic tool to identify optically sub-luminous bursts. With this method we can also find GRBs that are extremely bright at optical wavelengths. We show that the previously suggested correlation between the optical darkness and the X-ray/gamma-ray brightness is merely an observational selection effect.

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