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We present observations of GRB 060124, the first event for which both the\udprompt and the afterglow emission could be observed simultaneously and in their entirety by\udthe three Swift instruments and by Konus-Wind. Thanks to these exceptional circumstances,\udthe temporal and spectral properties of the prompt emission could be studied in the optical,\udX-ray and gamma-ray ranges (up to 2 MeV). While the X-ray emission (0.2–10 keV) clearly\udtracks the gamma-ray burst, the optical component follows a different pattern, likely indicating\uda different origin, possibly the onset of external shocks. The prompt GRB spectrum shows\udsignificant spectral evolution, with both the peak energy and the spectral index varying. As\udobserved in several long GRBs, significant lags are measured between the hard- and lowenergy\udcomponents, showing that this behaviour extends over 3 decades in energy. The GRB\udpeaks are also much broader at soft energies. This is related to the temporal evolution of the\udspectrum, and can be accounted for by the softening of the electron spectral index with time.\udThe burst energy (Eiso ∼ 5 × 1053 erg at z = 2.297) and average peak energy (Ep ∼ 300 keV)\udmake GRB 060124 consistent with the Amati relation. The X-ray afterglow is characterized\udby a decay which presents a break at tb ∼ 105\uds.This work was supported at INAF by ASI grant I/R/039/04Peer-reviewedPost-printWorkshop on Swift and GRBs - Unveiling the Relativistic University, Venice, ITAL

Panchromatic study of GRB 060124: From precursor to afterglow