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Dust and Metal Column Densities in Gamma-Ray Burst Host Galaxies
P. Schady, M. J. Page, S. R. Oates +7
In this paper we present the results from the analysis of a sample of 28 gamma-ray burst (GRB) afterglow spectral energy distributions, spanning the X-ray through to near-infrared…
Spectra and Light Curves of Failed Supernovae
Chris L. Fryer, Peter J. Brown, Filomena Bufano +11
Astronomers have proposed a number of mechanisms to produce supernova explosions. Although many of these mechanisms are now not considered primary engines behind supernovae, they d…
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…
Ultraviolet Spectroscopy of Supernovae: The First Two Years of Swift Observations
F. Bufano, S. Immler, M. Turatto +13
We present the entire sample of ultraviolet (UV) spectra of supernovae (SNe) obtained with the Ultraviolet/Optical Telescope (UVOT) on board the Swift satellite during the first 2…
Swift-UVOT captures the earliest ultraviolet spectrum of a Gamma Ray Burst
N. P. M. Kuin, W. B. Landsman, M. J. Page +22
We present the earliest ever ultraviolet spectrum of a gamma-ray burst (GRB) as observed with the Swift-UVOT. The GRB 081203A spectrum was observed for 50 seconds with the UV grism…
The unusual X-ray light-curve of GRB 080307: the onset of the afterglow?
K. L. Page, R. Willingale, P. T. O'Brien +11
Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light-curve around 100 seconds after the burst, at the start of which the emission briefly softened. This `hump…