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Articles dans des revues avec comité de lecture |
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| Domaine : |
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| Titre : |
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GRB 110205A: Anatomy of a long gamma-ray burst |
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| Auteur(s) : |
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Bruce Gendre 1, Jean-Luc Atteia 2, Michel Boër 3, François Colas 4, Alain Klotz 2, François Kugel 5, Myrtille Laas-Bourez 6, Claudine Rinner 5, Jean Strajnic 7, Giulia Stratta 1, Frédéric Vachier 4 |
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| Laboratoire : |
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| Résumé : |
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The 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 absence of correlation of the X-ray emission compared to the optical and high energy gamma-ray ones during the prompt phase ; and a large optical re-brightening 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. |
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Langue du texte
intégral : |
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Anglais |
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Date de production,
écriture : |
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10/01/2012 |
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| Journal : |
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| Astrophysical Journal (Astrophys. J.) |
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American Astronomical Society |
| ISSN |
0004-637X |
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| Audience : |
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internationale |
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| Date de publication : |
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03/2012 |
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| Volume : |
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748 |
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| Numéro : |
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1 |
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| Page, identifiant, ... : |
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article id. 59 |
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| Mots Clés : |
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gamma-ray burst: individual: GRB 110205A |
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| Commentaire : |
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21 pages, 5 figures. The original publication is available at http://iopscience.iop.org/0004-637X. |
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