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Enhanced high-energy neutrino emission from choked gamma-ray bursts due to meson and muon acceleration
Hylke B. J. Koers, Ralph A. M. J. Wijers
It has been suggested that a potentially large fraction of supernovae could be accompanied by relativistic outflows that stall below the stellar surface. In this letter we point ou…
The host of GRB 060206: kinematics of a distant galaxy
Christina C. Thoene, Klaas Wiersema, Cedric Ledoux +13
We present early (starting 1.6h after the burst) WHT/ISIS optical spectroscopy of the afterglow of the gamma-ray burst GRB 060206 detecting a range of metal absorption lines and th…
GRB 060206 and the quandary of achromatic breaks in afterglow light curves
P. A. Curran, A. J. van der Horst, R. A. M. J. Wijers +20
Gamma-ray burst afterglow observations in the Swift era have a perceived lack of achromatic jet breaks compared to the BeppoSAX era. We present our multi-wavelength analysis of GRB…
GRB051022: physical parameters and extinction of a prototype dark burst
Evert Rol, Alexander van der Horst, Klaas Wiersema +19
GRB051022 was undetected to deep limits in early optical observations, but precise astrometry from radio and X-ray showed that it most likely originated in a galaxy at z~0.8. We re…
Spectroscopy and multiband photometry of the afterglow of intermediate duration gamma-ray burst 040924 and its host galaxy
K. Wiersema, A. J. van der Horst, D. A. Kann +19
We present optical photometry and spectroscopy of the afterglow and host galaxy of gamma-ray burst 040924. This GRB had a rather short duration of T90 ~2.4s, and a well sampled opt…
GRB 030329: 3 years of radio afterglow monitoring
A. J. van der Horst, A. Kamble, R. A. M. J. Wijers +7
Radio observations of gamma-ray burst (GRB) afterglows are essential for our understanding of the physics of relativistic blast waves, as they enable us to follow the evolution of…
Detailed study of the GRB 030329 radio afterglow deep into the non-relativistic phase
A. J. van der Horst, A. Kamble, L. Resmi +8
We explore the physics behind one of the brightest radio afterglows ever, GRB 030329, at late times when the jet is non-relativistic. We determine the physical parameters of the bl…
Very different X-ray to optical column density ratios in gamma-ray burst afterglows: ionisation in GRB environments
D. Watson, J. Hjorth, J. P. U. Fynbo +4
We compare the HI column densities from Ly-alpha absorption to the metal column densities from X-ray absorption in gamma-ray burst (GRB) afterglows. Eight bursts of seventeen enter…
A new method of determining the initial size and Lorentz factor of gamma-ray burst fireballs using a thermal emission component
Asaf Pe'er, Felix Ryde, Ralph A. M. J. Wijers +2
In recent years increasing evidence has emerged for a thermal component in the gamma- and X-ray spectrum of the prompt emission phase in gamma-ray bursts. The temperature and flux…
Gamma-ray Burst host galaxy gas and dust
Rhaana Starling, Ralph Wijers, Klaas Wiersema
We report on the results of a study to obtain limits on the absorbing columns to wards an initial sample of 10 long Gamma-Ray Bursts observed with BeppoSAX, using a new approach to…
The nature of the dwarf starforming galaxy associated with GRB 060218 / SN2006aj
K. Wiersema, S. Savaglio, P. M. Vreeswijk +9
We present high resolution VLT UVES and low resolution FORS optical spectroscopy of supernova 2006aj and its host galaxy, associated with the nearby (z = 0.03342) gamma-ray burst G…
The prompt to late-time multiwavelength analysis of GRB 060210
P. A. Curran, A. J. van der Horst, A. P. Beardmore +19
We present our analysis of the multiwavelength photometric & spectroscopic observations of GRB 060210 and discuss the results in the overall context of current GRB models. All avai…