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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…
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 Optical SN 2012bz Associated with the Long GRB 120422A
A. Melandri, E. Pian, P. Ferrero +34
The association of Type Ic SNe with long-duration GRBs is well established. We endeavor, through accurate ground-based observational campaigns, to characterize these SNe at increas…
Identifying the Location in the Host Galaxy of the Short GRB 111117A with the Chandra Sub-arcsecond Position
T. Sakamoto, E. Troja, K. Aoki +31
We present our successful Chandra program designed to identify, with sub-arcsecond accuracy, the X-ray afterglow of the short GRB 111117A, which was discovered by Swift and Fermi.…
On the Environment of Short Gamma-ray Bursts
D. Kopač, P. D'Avanzo, A. Melandri +8
In this paper we present a sample of 10 short gamma-ray bursts (GRBs) with a robust redshift determination, discovered by the Swift satellite up to January 2011. We measure their X…