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The circumburst density profile around GRB progenitors: a statistical study
S. Schulze, S. Klose, G. Björnsson +6
According to our present understanding, long GRBs originate from the collapse of massive stars while short bursts are due to the coalescence of compact stellar objects. Since the a…
Probing GRB environments with time variability: ULTRASPEC fast imaging of GRB 080210
A. De Cia, P. Jakobsson, G. Björnsson +12
We present high time resolution (1.09 s) photometry of GRB 080210 obtained with ULTRASPEC mounted on the ESO/3.6-m telescope, starting 68.22 min after the burst and lasting for 26.…
A High Signal-to-Noise Ratio Composite Spectrum of Gamma-ray Burst Afterglows
L. Christensen, J. P. U. Fynbo, J. X. Prochaska +3
We present a composite spectrum of 60 long duration gamma-ray burst (GRB) afterglows with redshifts in the range 0.35<z<6.7 observed with low resolution optical spectra. The compos…
VLT/X-shooter spectroscopy of the GRB 090926A afterglow
V. D'Elia, J. P. U. Fynbo, S. Covino +21
The aim of this paper is to study the environment and intervening absorbers of the gamma-ray burst GRB 090926A through analysis of optical spectra of its afterglow. We analyze medi…
Searching for differences in Swift's intermediate GRBs
A. de Ugarte Postigo, I. Horváth, P. Veres +16
Gamma-ray bursts are usually classified through their high-energy emission into short-duration and long-duration bursts, which presumably reflect two different types of progenitors…
Discovery of the afterglow and host galaxy of the low redshift short GRB 080905A
A. Rowlinson, K. Wiersema, A. J. Levan +10
We present the discovery of short GRB 080905A, its optical afterglow and host galaxy. Initially discovered by Swift, our deep optical observations enabled the identification of a f…