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Gamma-ray burst afterglows from trans-relativistic blast waves
H. J. van Eerten, K. Leventis, Z. Meliani +1
We present a study of the intermediate regime between ultra-relativistic and nonrelativistic flow for gamma-ray burst afterglows. The hydrodynamics of spherically symmetric blast w…
Low frequency observations of the radio nebula produced by the giant flare from SGR 1806-20
H. Spreeuw, B. Scheers, R. A. M. J. Wijers
The 2004 December 27 giant flare from SGR 1806-20 produced a radio nebula that was detectable for weeks. It was observed at a wide range of radio frequencies. We made a total of 19…
Gamma-ray burst afterglows from trans-relativistic blast wave simulations
H. J. van Eerten, K. Leventis, Z. Meliani +2
We present a study of the intermediate regime between ultra-relativistic and nonrelativistic flow for gamma-ray burst afterglows. The hydrodynamics of spherically symmetric blast w…
No visible optical variability from a relativistic blast wave encountering a wind-termination shock
H. J. van Eerten, Z. Meliani, R. A. M. J. Wijers +1
Gamma-ray burst afterglow flares and rebrightenings of the optical and X-ray light curve have been attributed to both late time inner engine activity and density changes in the med…
A glimpse of the end of the dark ages: the gamma-ray burst of 23 April 2009 at redshift 8.3
N. R. Tanvir, D. B. Fox, A. J. Levan +59
It is thought that the first generations of massive stars in the Universe were an important, and quite possibly dominant, source of the ultra-violet radiation that reionized the hy…
Optical Classification of Gamma-Ray Bursts in the Swift Era
A. J. van der Horst, C. Kouveliotou, N. Gehrels +5
We propose a new method for the classification of optically dark gamma-ray bursts (GRBs), based on the X-ray and optical-to-X-ray spectral indices of GRB afterglows, and utilizing…
A new perspective on GCRT J1745-3009
H. Spreeuw, B. Scheers, R. Braun +4
Two WSRT observations were performed and five archival VLA data were reduced in order to redetect the enigmatic radio transient GCRT J1745-3009. The source was not redetected. We w…
From blast wave to observation
H. J. van Eerten, R. A. M. J. Wijers
Gamma-ray burst (GRB) afterglows are well described by synchrotron emission originating from the interaction between a relativistic blast wave and the external medium surrounding t…