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A strong optical flare before the rising afterglow of GRB 080129
J. Greiner, T. Krühler, S. McBreen +11
We report on GROND observations of a 40 sec duration (rest-frame) optical flare from GRB 080129 at redshift 4.349. The rise- and decay time follow a power law with indices +12 and…
Structure of Neutron Stars in Tensor-Vector-Scalar Theory
Paul D. Lasky, Hajime Sotani, Dimitrios Giannios
Bekenstein's Tensor-Vector-Scalar (TeVeS) theory has had considerable success in explaining various phenomena without the need for dark matter. However, it is difficult to observat…
Deceleration of arbitrarily magnetized GRB ejecta: the complete evolution
P. Mimica, D. Giannios, M. A. Aloy
(Abridged) We aim to quantitatively understand the dynamical effect and observational signatures of magnetization of the GRB ejecta on the onset of the afterglow. We perform ultrah…
Soft X-ray components in the hard state of accreting black holes
Caroline D'Angelo, Dimitrios Giannios, Cornelis Dullemond +1
Recent observations of two black hole candidates (GX 339-4 and J1753.5-0127) in the low-hard state (L_X/L_Edd ~ 0.003-0.05) suggest the presence of a cool accretion disk very close…
A jet model for Galactic black-hole X-ray sources: Some constraining correlations
N. D. Kylafis, I. E. Papadakis, P. Reig +2
Some recent observational results impose significant constraints on all the models that have been proposed to explain the Galactic black-hole X-ray sources in the hard state. In pa…
Powerful GeV emission from a gamma-ray-burst shock wave scattering stellar photons
Dimitrios Giannios
The gamma-ray bursts (GRBs) of long duration are very likely to be connected to the death of massive stars. The gamma-ray emission is believed to come from energy released internal…