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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…
Timing accuracy of the Swift X-Ray Telescope in WT mode
G. Cusumano, V. La Parola, M. Capalbi +8
The X-Ray Telescope (XRT) on board Swift was mainly designed to provide detailed position, timing and spectroscopic information on Gamma-Ray Burst (GRB) afterglows. During the miss…
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…
Radio-to-gamma-ray Monitoring of the Narrow-Line Seyfert 1 Galaxy PMN J0948+0022 from 2008 to 2011
L. Foschini, E. Angelakis, L. Fuhrmann +39
We present more than three years of observations at different frequencies, from radio to high-energy gamma-rays, of the Narrow-Line Seyfert 1 (NLS1) Galaxy PMN J0948+0022 (z=0.585)…
High redshift Fermi blazars observed by GROND and Swift
G. Ghisellini, M. Nardini, G. Tagliaferri +7
We observed 5 gamma-ray loud blazars at redshift greater than 2 with the X-Ray Telescope (XRT) and the UltraViolet and Optical Telescope (UVOT) onboard the Swift satellite, and the…
The Swift X-ray Telescope Cluster Survey: data reduction and cluster catalog for the GRB fields
Elena Tundo, Alberto Moretti, Paolo Tozzi +4
(abridged) We present a new sample of X-ray selected galaxy groups and clusters serendipitously observed with Swift and the X-ray Telescope (XRT). We searched the XRT archive for e…