Physics
Scientific paper
May 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1111..383b&link_type=abstract
PROBING STELLAR POPULATIONS OUT TO THE DISTANT UNIVERSE: CEFALU 2008, Proceedings of the International Conference. AIP Conferen
Physics
1
Gamma-Ray Sources, Gamma-Ray Bursts, Galactic Nuclei, Circumnuclear Matter, And Bulges, Binary And Multiple Stars
Scientific paper
GRB 060607 A is a very distant and energetic event. Its main peculiarity is that the peak of the near-infrared (NIR) afterglow has been observed with the REM robotic telescope, allowing to estimate the initial Lorentz gamma factor within the fireball forward shock model. We analyze GRB 060607 A within the fireshell model. The initial Lorentz gamma factor of the fireshell can be obtained adopting the exact solutions of its equations of motion, dealing only with the BAT and XRT observations, that are the basic contribution to the afterglow emission, up to a distance from the progenitor r~1018 cm. According to the ``canonical GRB'' scenario we interpret the whole prompt emission as the peak of the afterglow emission, and we show that the observed temporal variability of the prompt emission can be produced by the interaction of the fireshell with overdense CircumBurst Medium (CBM) clumps. This is indeed the case also of the X-ray flares which are present in the early phases of the afterglow light curve.
Bianco Carlo Luciano
Caito Letizia
Giovanna Dainotti Maria
Grazia Bernardini Maria
Guida Riccardo
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