Dark Gamma-Ray Bursts in the Swift Era

Details Dark Gamma-Ray Bursts in the Swift Era Dark Gamma-Ray Bursts in the Swift Era

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1133..193v&link_type=abstract

GAMMA-RAY BURST: Sixth Huntsville Symposium. AIP Conference Proceedings, Volume 1133, pp. 193-198 (2009).

Physics

Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray Sources, X-Ray Bursts, X- And Gamma-Ray Telescopes And Instrumentation

Scientific paper

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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