Journal of the Korean Physical Society

pISSN 0374-4884 eISSN 1976-8524


Published online September 15, 2010

Copyright © The Korean Physical Society.

GRB 090423 at Redshift 8.1: a Theoretical Interpretation

Luca Izzo, Maria Grazia Bernardini, Carlo Luciano Bianco, Letizia Caito, Barbara Patricelli, Remo Ruffini

J. Korean Phys. Soc. 57(3(1)), 551 - 556 (2010)


GRB 090423 is the farthest GRB ever observed, with a redshift of about 8.1.We present within the Fireshell scenario a complete analysis of this GRB.We model the prompt emission and the first rapid flux decay of the afterglow emission as due to the canonical emission of the interaction, in the interval $0 leq t leq 440$ s, by the accelerated baryonic matter with the CBM.After the data reduction of the Swift data in the BAT (15-150 keV) and XRT (0.2-10 keV) energy bands, we interpret the light curves and the spectral distribution in the context of the Fireshell scenario.We confirm also in this source the existence of a second component, the plateau phase, as responsible for the late emission in the X-ray light curve.This extra component originates from the fact that the ejecta have a range of bulk Lorentz $Gamma$ factor, which starts to interact each other at the start of the plateau phase.