The unexpected clustering of the optical afterglow luminosities

Details The unexpected clustering of the optical afterglow luminosities The unexpected clustering of the optical afterglow luminosities

2006-12-18

arxiv.org/abs/astro-ph/0612486v1

Nuovo Cim.B121:1539-1540,2006

Astronomy and Astrophysics

Astrophysics

2 pages, 2 figures, To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe"

Scientific paper

10.1393/ncb/i2007-10319-5

We studied the behaviour of the optical afterglow lightcurves of a sample of 24 Gamma--Ray Bursts (GRBs) with known redshift and published estimates of the optical extinction in the source frame, detected before the SWIFT satellite launch. We found an unexpected clustering of the optical luminosities at 12 hours in the source frame. The distribution of the optical luminosities is narrower than the distribution of X-ray luminosities at the same time. Few (3) bursts stand apart from the main optical distribution, being fainter by a factor of about 15. We also analysed the optical luminosities of the SWIFT burst with known redshift finding that the luminosity distribution is similar to the pre SWIFT GRBs one, even if they have a different mean redshift. These results can suggest the existence of a family of intrinsically optically under--luminous dark GRBs.

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