The GRB of 1999 January 23: prompt emission and broad-band afterglow modeling

Details The GRB of 1999 January 23: prompt emission and broad-band afterglow modeling The GRB of 1999 January 23: prompt emission and broad-band afterglow modeling

2005-05-02

arxiv.org/abs/astro-ph/0505020v2

Nuovo Cim.C28:493-496,2005

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures, minor changes; accepted for publication in Il Nuovo Cimento, proceedings of the 4th Workshop on Gamma-Ray

Scientific paper

10.1393/ncc/i2005-10091-7

We report on BeppoSAX simultaneous X- and gamma-ray observations of the bright gamma-ray burst (GRB) 990123. We present the broad-band spectrum of the prompt emission, including optical, X- and gamma-rays, confirming the suggestion that the emission mechanisms at low and high frequencies must have different physical origins. We discuss the X-ray afterglow observed by the Narrow Field Instruments (NFIs) on board BeppoSAX and its hard X-ray emission up to 60 keV several hours after the burst, in the framework of the standard fireball model. The effects of including an important contribution of Inverse Compton scattering or modifying the hydrodynamics are studied.

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