ar X iv : a st ro - p h / 02 06 34 2 v 1 2 0 Ju n 20 02 Evidence for Post - Quiescent , High - Energy Emission from Gamma - Ray Burst 990104

ar X iv : a st ro - p h / 02 06 42 3 v 1 2 4 Ju n 20 02 EARLY GRB AFTERGLOWS REVISITED

The standard afterglow model neglects the presence of the GRB prompt radiation ahead of the blast wave. In fact, the blast wave is dramatically influenced by the leading gamma-ray front which preaccelerates the ambient medium and loads it with electron-positron pairs. The front sweeps the medium outward with a high Lorentz factor and results in a spectacular effect: the GRB ejecta moves freely ...

ar X iv : a st ro - p h / 02 07 57 8 v 1 2 6 Ju l 2 00 2 Variable gamma - ray emission from microblazars

We propose a model for gamma-ray emitting microblazars based on the Compton interaction of a relativistic electron-positron plasma, ejected in a jet feature, with the UV-photon field provided by a high-mass stellar companion. Taking into account the gravitational effects of the star upon the accretion disk, we predict a jet precession which results in a variable, periodic, high-energy gamma-ray...

ar X iv : a st ro - p h / 02 06 46 6 v 1 2 6 Ju n 20 02 X - ray Detection of the Inner Jet in the Radio Galaxy 3 C 129

During the course of an investigation on the interaction of the radio galaxy 3C129 and its ambient cluster gas, we found excess X-ray emission aligned with the northern radio jet. The emission extends from the weak X-ray core of the host galaxy ≈ 2.5 to the first resolved radio knot. On a smaller scale, we have also detected a weak radio extension in the same position angle with the VLBA. Altho...

ar X iv : h ep - p h / 02 06 17 1 v 2 2 4 Ju n 20 02 IPHE 2002 - 009 June 24 , 2002 B 0 – B 0 MIXING

ar X iv : a st ro - p h / 02 05 14 4 v 2 1 9 Ju n 20 02 X - ray Rich GRB , Photospheres and Variability

We investigate the relationship between the quasi-thermal baryon-related photosphere in relativistic outflows, and the internal shocks arising outside them, which out to a limiting radius may be able to create enough pairs to extend the optically thick region. Variable gamma-ray light curves are likely to arise outside this limiting pair-forming shock radius, while X-ray excess bursts may arise...