The puzzling clustering and bimodality of long GRBs optical afterglow luminosities

Details The puzzling clustering and bimodality of long GRBs optical afterglow luminosities The puzzling clustering and bimodality of long GRBs optical afterglow luminosities

2009-07-30

arxiv.org/abs/0907.5426v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

2 pages, 2 figures. Proceeding of the 44th Rencontres de Moriond "Very High Energy Phenomena in the Universe"

Scientific paper

The study of the rest frame properties of long Gamma-Ray bursts (GRBs) afterglows is a fundamental aspect for a better understanding of the nature of these powerful explosions. The launch of the Swift satellite (November 2004) marked a strong improvement of the observational capabilities of X-rays and optical afterglows. We studied the intrinsic optical afterglows of a sample of long GRBs finding an unexpected clustering and a hint of bimodality of the optical luminosity distribution (at 12h after the trigger). Through a Montecarlo simulation we proved that both the observed clustering and bimodality are not simply due to selection effects but should hide important information in the understanding of the nature of the afterglow emission. These findings can shed also light on the nature of the large fraction of optically dark GRBs.

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