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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 | Abstract: | 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 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 | Services: | Forum | Review | PDF | Favorites |
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