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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…
Gamma-Ray Burst Selected High Redshift Galaxies: Comparison to Field Galaxy Populations to z~3
C. J. Conselice, P. M. Vreeswijk, A. S. Fruchter +6
We study the internal structural properties of 37 long duration gamma-ray burst (GRB) host galaxies imaged with the Hubble Space Telescope. Fitting exponential disk and r^1/4 model…
GRB 050509B: Constraints on short gamma-ray burst models
J. Hjorth, J. Sollerman, J. Gorosabel +19
We have obtained deep optical images with the Very Large Telescope at ESO of the first well-localized short-duration gamma-ray burst, GRB 050509B. From V and R imaging, initiated ~…
The Early (<1 hr) Multi-Color Afterglow of GRB 050502a: Possible Evidence for a Uniform Medium with Density Clumps
C. Guidorzi, A. Monfardini, A. Gomboc +11
The 2-m robotic Liverpool Telescope reacted promptly to the gamma-ray burst GRB 050502a discovered by INTEGRAL and started observing 3 min after the onset of the GRB. The automatic…
GRB 021004 modelled by multiple energy injections
A. de Ugarte Postigo, A. J. Castro-Tirado, J. Gorosabel +43
GRB 021004 is one of the best sampled gamma-ray bursts (GRB) to date, although the nature of its light curve is still being debated. Here we present a large amount (107) of new opt…
The INT/WFC survey of the Monoceros Ring: Accretion origin or Galactic Anomaly?
Blair C. Conn, Geraint F. Lewis, Mike J. Irwin +4
We present the results of a wide-field camera survey of the stars in the Monoceros Ring, thought to be an additional structure in the Milky Way of unknown origin. Lying roughly in…
A Minor Axis Surface Brightness Profile for M31
Mike Irwin, Annette Ferguson, Rodrigo Ibata +2
We use data from the Isaac Newton Telescope Wide Field Camera survey of M31 to determine the surface brightness profile of M31 along the south-east minor axis. We combine surface p…
A Keck/DEIMOS Kinematic Study of Andromeda IX: dark matter on the smallest galactic scales
Scott C. Chapman, Rodrigo Ibata, Geraint F. Lewis +4
We present the results of a kinematic survey of the dwarf spheroidal satellite of M31, And-IX, which appears to be the lowest surface brightness and also the faintest galaxy (M_V =…
On the Afterglow and Host Galaxy of GRB021004: A Comprehensive Study with the Hubble Space Telescope
J. P. U. Fynbo, J. Gorosabel, A. Smette +24
(Abridged) We report on HST observations of the late-time afterglow and host galaxy of GRB021004 (z=2.33). Although this GRB is one of the best observed so far, there is substantia…
The redshift distribution of gamma-ray bursts revisited
Priyamvada Natarajan, Badr Albanna, Jens Hjorth +3
In this letter, we calculate the redshift distribution of gamma-ray bursts assuming that they trace (i) the globally averaged star formation rate or (ii) the average metallicity in…
On the accretion origin of a vast extended stellar disk around the Andromeda galaxy
R. Ibata, S. Chapman, A. M. N. Ferguson +3
We present the discovery of an inhomogenous, low-surface brightness, extended disk-like structure around the Andromeda galaxy (M31) based on a large kinematic survey of more than 2…
Determination of Cepheid parameters by light-curve template-fitting
N. R. Tanvir, M. A. Hendry, A. Watkins +3
We describe techniques to characterise the light-curves of regular variable stars by applying principal component analysis (PCA) to a training set of high quality data, and to fit…
SCUBA sub-millimeter observations of gamma-ray bursters IV. GRB 021004, 021211, 030115, 030226, 041006
I. A. Smith, R. P. J. Tilanus, N. Tanvir +7
We discuss our ongoing program of Target of Opportunity (ToO) sub-millimeter observations of gamma-ray bursts (GRBs) using the Sub-millimetre Common-User Bolometer Array (SCUBA) on…
SCUBA sub-millimeter observations of gamma-ray bursters III. GRB 030329: The brightest sub-millimeter afterglow to date
I. A. Smith, R. P. J. Tilanus, N. Tanvir +4
We discuss our ongoing program of Target of Opportunity (ToO) sub-millimeter observations of gamma-ray bursts (GRBs) using the Sub-millimetre Common-User Bolometer Array (SCUBA) on…
Early GRB Optical and Infrared Afterglow Observations with the 2-m Robotic Liverpool Telescope
A. Gomboc, C. G. Mundell, C. Guidorzi +12
We present the first optical observations of a Gamma Ray Burst (GRB) afterglow using the 2-m robotic Liverpool Telescope (LT), which is owned and operated by Liverpool John Moores…
Spectroscopy of GRB 021004: a structured jet ploughing through a massive stellar wind
R. L. C. Starling, R. A. M. J. Wijers, M. A. Hughes +4
We present spectra of the afterglow of GRB 021004 taken with WHT ISIS and VLT FORS1 at three epochs spanning 0.49--6.62 days after the burst. We observe strong absorption likely co…