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20 April 2024

» arxiv » astro-ph/0601567

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The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624
P. D’Avanzo ; P. Filliatre ; P. Goldoni ; L. A. Antonelli ; S. Campana ; G. Chincarini ; S. Covino ; A. Cucchiara ; M. Della Valle ; A. De Luca ; S. Foley ; D. Fugazza ; N. Gehrels ; D. Götz ; L. Hanlon ; G. L. Israel ; D. Malesani ; B. McBreen ; S. McBreen ; S. McGlynn ; S. Mereghetti ; L. Moran ; J. A. Nousek ; R. Perna ; L. Stella ; G. Tagliaferri ;
Date:	25 Jan 2006
Abstract:	Understanding the reasons for the faintness of the optical/near-infrared afterglows of the so-called dark bursts is essential to assess whether they form a subclass of GRBs, and hence for the use of GRBs in cosmology. With VLT and other ground-based telescopes, we searched for the afterglows of the INTEGRAL bursts GRB 040223, GRB 040422 and GRB 040624 in the first hours after the triggers. A detection of a faint afterglow and of the host galaxy in the K band was achieved for GRB 040422, while only upper limits were obtained for GRB 040223 and GRB 040624, although in the former case the X-ray afterglow was observed. A comparison with the magnitudes of a sample of afterglows clearly shows the faintness of these bursts, which are good examples of a population that an increasing usage of large diameter telescopes is beginning to unveil.
Source:	arXiv, astro-ph/0601567
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