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28 March 2024
 
  » arxiv » 1110.0734

 Article overview


GRB 110205A: Anatomy of a long gamma-ray burst
B. Gendre ; J.L. Atteia ; M. Boër ; F. Colas ; A. Klotz ; F. Kugel ; M. Laas-Bourez ; C. Rinner ; J. Strajnic ; G. Stratta ; F. Vachier ;
Date 4 Oct 2011
AbstractThe Swift burst GRB 110205A was a very bright burst visible in the Northern hemisphere. GRB 110205A was intrinsically long and very energetic and it occurred in a low-density interstellar medium environment, leading to delayed afterglow emission and a clear temporal separation of the main emitting components: prompt emission, reverse shock, and forward shock. Our observations show several remarkable features of GRB 110205A : the detection of prompt optical emission strongly correlated with the BAT light curve, with no temporal lag between the two ; the detection of an X-ray excess above the extrapolation of the Band function measured in gamma-rays during the prompt phase ; and a large optical flare after the end of the prompt phase, that we interpret as a signature of the reverse shock. Beyond the pedagogical value offered by the excellent multi-wavelength coverage of a GRB with temporally separated radiating components, we discuss several questions raised by our observations: the nature of the prompt optical emission and the spectral evolution of the prompt emission at high-energies (from 0.5 keV to 150 keV) ; the origin of an x-ray flare at the beginning of the forward shock; and the modeling of the afterglow, including the reverse shock, in the framework of the classical fireball model.
Source arXiv, 1110.0734
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