The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624

Details The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624 The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624

2006-01-25

arxiv.org/abs/astro-ph/0601567v1

AIPConf.Proc.836:467-470,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. To appear in the proceedings of the 16th Annual October Astrophysics Conference in Maryland "Gamma Ray Bur

Scientific paper

10.1063/1.2207942

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.

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