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Poster communications

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

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.
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Contributor : Simone Lantz <>
Submitted on : Tuesday, January 31, 2006 - 11:23:26 AM
Last modification on : Wednesday, September 23, 2020 - 4:36:58 AM

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P. d'Avanzo, P. Filliatre, P. Goldoni, L.A. Antonelli, S. Campana, et al.. The frontier of darkness: the cases of GRB 040223, GRB 040422, GRB 040624. Stephen S. Holt, Franklin W. Olin, Neil Gehrels, John A. Nousek. Gamma-Ray Bursts in the Swift Era: Sixteenth Maryland Astrophysics Conference, Nov 2005, Washington D. C., United States. American Institute of Physics, 836, pp.467-470, 2006, AIP Conference Proceedings. ⟨10.1063/1.2207942⟩. ⟨in2p3-00025533⟩



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