Wind circumburst density profile: a linear E_p-E_gamma correlation

Details Wind circumburst density profile: a linear E_p-E_gamma correlation Wind circumburst density profile: a linear E_p-E_gamma correlation

2007-01-17

arxiv.org/abs/astro-ph/0701496v1

Nuovo Cim.B121:1541-1542,2006

Astronomy and Astrophysics

Astrophysics

To be published in the proceedings of the conference "SWIFT and GRBs: Unveiling the Relativistic Universe", Venice, June 5-9,

Scientific paper

10.1393/ncb/i2007-10302-2

Ghirlanda et al. (2004) derived the collimation-corrected energy E_gamma 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_gamma and the rest frame peak energy of the nuF_nu prompt spectrum (E_p). Nava et al. (2006) showed that, assuming a circumburst density distribuited 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.

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