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GRBs have preferred jet opening angles and bulk Lorentz factors
G. Ghisellini, G. Ghirlanda, R. Salvaterra +7
We recently found that Gamma Ray Burst energies and luminosities, in their comoving frame, are remarkably similar. This, coupled with the clustering of energetics once corrected fo…
Anisotropic CR diffusion and gamma-ray production close to supernova remnants, with an application to W28
Lara Nava, Stefano Gabici
Cosmic rays that escape their acceleration site interact with the ambient medium and produce gamma rays as the result of inelastic proton-proton collisions. The detection of such d…
Afterglow emission in Gamma-Ray Bursts: I. Pair-enriched ambient medium and radiative blast waves
L. Nava, L. Sironi, G. Ghisellini +2
Forward shocks caused by the interaction between a relativistic blast wave and the circum-burst medium are thought to be responsible for the afterglow emission in Gamma-Ray Bursts…
The faster the narrower: characteristic bulk velocities and jet opening angles of Gamma Ray Bursts
G. Ghirlanda, G. Ghisellini, R. Salvaterra +6
The jet opening angle theta_jet and the bulk Lorentz factor Gamma_0 are crucial parameters for the computation of the energetics of Gamma Ray Bursts (GRBs). From the ~30 GRBs with…
A complete sample of bright Swift Gamma-Ray Bursts: X-ray afterglow luminosity and its correlation with the prompt emission
P. D'Avanzo, R. Salvaterra, B. Sbarufatti +12
We investigate wheter there is any correlation between the X-ray afterglow luminosity and the prompt emission properties of a carefully selected sub-sample of bright Swift long Gam…
The impact of selection biases on the Ep-Liso correlation of Gamma Ray Bursts
G. Ghirlanda, G. Ghisellini, L. Nava +8
We study the possible effects of selection biases on the Ep-Liso correlation caused by the unavoidable presence of flux-limits in the existing samples of Gamma Ray Bursts (GRBs). W…