Wind circumburst density profile : A linear Ep-Ercorrelation

Ghirlanda ct at. (2004) derived the collimation-corrected energy E γ for a sample of 15 bursts under the assumption of a homogeneous circumburst density profile. They found a correlation (the so-called Ghirlanda correlation) between E γ and the rest frame peak energy of the vF v prompt spectrum (Ep). Nava et al. (2006) showed that, assuming a circumburst density distributed with a r -2 wind profile, the Ghirlanda correlation remains tight and becomes linear. This implies that: i) it remains linear also in the comoving frame, no matter the distribution of bulk Lorentz factors, ii) it entails that different bursts have the same number of relevant photons. We have updated these findings including recently detected bursts (21 in total), stressing the two important implications.