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4 papers · 1 filter
Log-parabolic spectra and particle acceleration in blazars. III: SSC emission in the TeV band from Mkn 501
E. Massaro, A. Tramacere, M. Perri +2
Curved broad-band spectral distributions of non-thermal sources like blazars are described well by a log-parabolic (LP) law where the second degree term measures the curvature. LP…
Swift-UVOT detection of GRB 050318
M. Still, P. W. A. Roming, K. O. Mason +27
We present observations of GRB 050318 by the Ultra-Violet and Optical Telescope (UVOT) on-board the Swift observatory. The data are the first detections of a Gamma Ray Burst (GRB)…
Non-thermal Cosmic Backgrounds from Blazars: the contribution to the CMB, X-ray and gamma-ray Backgrounds
P. Giommi, S. Colafrancesco, E. Cavazzuti +2
We present a new assessment of the contribution of Blazars to the extragalactic background radiation across the e.m. spectrum. Our calculations rely on deep Blazar radio counts tha…
Spectral changes during six years of Scorpius X-1 monitoring with BeppoSAX Wide Field Cameras
Patrizia Santolamazza, Fabrizio Fiore, Luciano Burderi +1
We analyse a sample of fifty-five observations of Scorpius X-1 available in the BeppoSAX Wide Field Camera public archive and spanning over the six years of BeppoSAX mission life.…