Panchromatic study of GRB 060124: from precursor to afterglow

Details Panchromatic study of GRB 060124: from precursor to afterglow Panchromatic study of GRB 060124: from precursor to afterglow

2006-12-18

arxiv.org/abs/astro-ph/0612494v2

Nuovo Cim.B121:1067-1071,2006

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures. Proceedings of `SWIFT and GRBs: Unveiling the Relativistic Universe', June 5-9, 2006 Venice (Italy), to ap

Scientific paper

10.1393/ncb/i2007-10062-y

We present observations of GRB 060124, the first event for which both the prompt and the afterglow emission could be observed simultaneously and in their entirety by the three Swift instruments and by Konus-Wind. Thanks to these exceptional circumstances, the temporal and spectral properties of the prompt emission could be studied in the optical, X-ray and gamma-ray ranges (up to 2 MeV). While the X-ray emission (0.2-10 keV) clearly tracks the gamma-ray burst, the optical component follows a different pattern, likely indicating a different origin, possibly the onset of external shocks. The prompt GRB spectrum shows significant spectral evolution, with both the peak energy and the spectral index varying. As observed in several long GRBs, significant lags are measured between the hard- and low-energy components, showing that this behaviour extends over 3 decades in energy. The GRB peaks are also much broader at soft energies. This is related to the temporal evolution of the spectrum, and can be accounted for by the softening of the electron spectral index with time. The burst energy (E_iso~5x10^{53} erg at z=2.297) and average peak energy (E_p~300 keV) make GRB 060124 consistent with the Amati relation. The X-ray afterglow is characterized by a decay which presents a break at t_b~10^5s.

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