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The concave X-ray spectrum of the blazar ON 231: the signature of intermediate BL Lac objects
G. Tagliaferri, G. Ghisellini, P. Giommi +17
ON 231 was observed with BeppoSAX in May and June 1998, following an exceptional optical outburst which occured in April--May. We measured the X-ray spectrum from 0.1 up to 100 keV…
Synchrotron and Inverse Compton Variability in the BL Lacertae object S5 0716+714
P. Giommi, E. Massaro, L. Chiappetti +14
We report intensity variations of different spectral components in the BL Lac object S5 0716+714 detected during coordinated BeppoSAX and optical observations in 1996 and 1998. The…
ISO observations of the BL Lac object PKS 2155-304
E. Bertone, G. Tagliaferri, G. Ghisellini +3
The Infrared Space Observatory (ISO) observed the BL Lac object PKS 2155-304 16 times from 1996, May 7 to June 8, with both the ISOCAM camera and the ISOPHOT photometer, as part of…
X-ray Rapid Variability of MKN 421
A. Treves, Y. H. Zhang, F. Tavecchio +7
We present a detailed Cross Correlation analysis of the light curves of the X-ray bright BL Lac object Mkn 421 observed with SAX period 1997-1998. Monte Carlo simulations ar…
Emission processes in gamma-ray bursts
Gabriele Ghisellini
Recent results of the hectic research activity about gamma-ray bursts will be reviewed, with emphasis about the emission processes at the origin of the observed gamma-rays. The con…
GRB 990510: linearly polarized radiation from a fireball
S. Covino, D. Lazzati, G. Ghisellini +12
Models for gamma-ray burst afterglows envisage an hyper-relativistic fireball that is decelerated in the ambient medium around the explosion site. This interaction produces a shock…