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GRB 050911: a black hole - neutron star merger or a naked GRB
K. L. Page, A. R. King, A. J. Levan +16
GRB 050911, discovered by the Swift Burst Alert Telescope, was not seen 4.6 hr later by the Swift X-ray Telescope, making it one of the very few X-ray non-detections of a Gamma-Ray…
A mean redshift of 2.8 for Swift gamma-ray bursts
P. Jakobsson, A. Levan, J. P. U. Fynbo +18
The exceptionally high luminosities of gamma-ray bursts (GRBs), gradually emerging as extremely useful probes of star formation, make them promising tools for exploration of the hi…
A log N(HI) = 22.6 DLA in a dark gamma-ray burst: the environment of GRB 050401
D. Watson, J. P. U. Fynbo, C. Ledoux +33
The optical afterglow spectrum of GRB050401 (at z=2.8992+/-0.0004) shows the presence of a DLA, with log(nHI)=22.6+/-0.3. This is the highest column density ever observed in a DLA,…
Discovery and identification of the very high redshift afterglow of GRB 050904
J. Haislip, M. Nysewander, D. Reichart +39
In 2000, Lamb and Reichart predicted that gamma-ray bursts (GRBs) and their afterglows occur in sufficient numbers and at sufficient brightnesses at very high redshifts (z > 5) to…
Gas and dust properties in the afterglow spectra of GRB 050730
R. L. C. Starling, P. M. Vreeswijk, S. L. Ellison +9
We present early WHT ISIS optical spectroscopy of the afterglow of gamma-ray burst GRB 050730. The spectrum shows a DLA system with the highest measured hydrogen column to date: N(…
An origin in the local Universe for some short gamma-ray bursts
N. R. Tanvir, R. Chapman, A. J. Levan +1
Gamma-ray bursts (GRBs) divide into two classes: "long", which typically have initial durations of T90>2s, and "short", with durations of T90<2s (where T90 is the time to detect 90…