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Optical Classification of Gamma-Ray Bursts in the Swift Era

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arxiv 0905.0524 v1 pith:JTYWE4GX submitted 2009-05-05 astro-ph.HE

Optical Classification of Gamma-Ray Bursts in the Swift Era

A.J. van der Horst , C. Kouveliotou , N. Gehrels , E. Rol , R.A.M.J. Wijers , J.K. Cannizzo , J. Racusin , D.N. Burrows This is my paper
classification astro-ph.HE
keywords burstsgamma-raymethodopticalclassificationgrbsopticallyspectral
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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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