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The optical rebrightening of GRB100814A: an interplay of forward and reverse shocks?
Massimiliano De Pasquale, N. P. M. Kuin, S. Oates +36
We present a wide dataset of gamma-ray, X-ray, UVOIR, and radio observations of the Swift GRB100814A. At the end of the slow decline phase of the X-ray and optical afterglow, this…
New constraints on GRB jet geometry and relativistic shock physics
C. Guidorzi, C. G. Mundell, R. Harrison +23
We use high--quality, multi-band observations of Swift GRB120404A, from gamma-ray to radio frequencies, together with the new hydrodynamics code of van Eerten et al. (2012) to test…
Spatially-resolved dust properties of the GRB 980425 host galaxy
Michał J. Michałowski, L. K. Hunt, E. Palazzi +30
Gamma-ray bursts (GRBs) have been proposed as a tool for studying star formation in the Universe, so it is crucial to investigate whether their host galaxies and immediate environm…
GRB 130427A: a Nearby Ordinary Monster
A. Maselli, A. Melandri, L. Nava +63
Long-duration Gamma-Ray Bursts (GRBs) are an extremely rare outcome of the collapse of massive stars, and are typically found in the distant Universe. Because of its intrinsic lumi…
A Community Science Case for E-ELT HIRES
R. Maiolino, M. Haehnelt, M. T. Murphy +57
Building on the experience of the high-resolution community with the suite of VLT high-resolution spectrographs, which has been tremendously successful, we outline here the (scienc…
GRB 091024A and the nature of ultra-long gamma-ray bursts
F. J. Virgili, C. G. Mundell, V. Pal'shin +30
We present a broadband study of gamma-ray burst (GRB) 091024A within the context of other ultra-long-duration GRBs. An unusually long burst detected by Konus-Wind, Swift, and Fermi…
Are gamma-ray bursts the same at high redshift and low redshift?
O. M. Littlejohns, N. R. Tanvir, R. Willingale +3
The majority of Swift gamma-ray bursts (GRBs) observed at z > 6 have prompt durations of T90 < 30s, which, at first sight, is surprising given that cosmological time-dilation means…
The Redshift Distribution of the TOUGH Survey
P. Jakobsson, R. Chapman, J. Hjorth +5
We present the redshift results from a Very Large Telescope program aimed at optimizing the legacy value of the Swift mission: to characterize a homogeneous, X-ray selected, sample…
The masses of Local Group dwarf spheroidal galaxies: The death of the universal mass profile
Michelle L. M. Collins, Scott C. Chapman, R. M. Rich +12
We investigate the claim that all dwarf spheroidal galaxies (dSphs) reside within halos that share a common, universal mass profile as has been derived for dSphs of the Galaxy. By…
The metallicity and dust content of a redshift 5 gamma-ray burst host galaxy
M. Sparre, O. E. Hartoog, T. Krühler +26
Observations of the afterglows of long gamma-ray bursts (GRBs) allow the study of star-forming galaxies across most of cosmic history. Here we present observations of GRB 111008A f…
Are GRBs the same at high and low redshift?
O. M. Littlejohns, N. R. Tanvir, R. Willingale +3
Due to their highly luminous nature, gamma-ray bursts (GRBs) are useful tools in studying the early Universe (up to z = 10). We consider whether the available subset of Swift high…
The low-extinction afterglow in the solar-metallicity host galaxy of GRB 110918A
J. Elliott, T. Krühler, J. Greiner +21
Galaxies selected through long gamma-ray bursts (GRBs) could be of fundamental importance when mapping the star formation history out to the highest redshifts. Before using them as…
Newly-Discovered Globular Clusters in NGC 147 and NGC 185 from PAndAS
J. Veljanoski, A. M. N. Ferguson, A. P. Huxor +8
Using data from the Pan-Andromeda Archaeological Survey (PAndAS), we have discovered four new globular clusters (GCs) associated with the M31 dwarf elliptical (dE) satellites NGC 1…
Spectroscopy of the short-hard GRB 130603B: The host galaxy and environment of a compact object merger
A. de Ugarte Postigo, C. C. Thoene, A. Rowlinson +40
Short duration gamma-ray bursts (SGRBs) are thought to be related to the violent merger of compact objects, such as neutron stars or black holes, which makes them promising sources…
GRB 120521C at z~6 and the Properties of High-redshift GRBs
T. Laskar, E. Berger, N. Tanvir +9
We present optical, near-infrared, and radio observations of the afterglow of GRB 120521C. By modeling the multi-wavelength dataset, we derive a photometric redshift of z~6.0, whic…
The highest redshift gamma-ray bursts
N. R. Tanvir
I review the searches for gamma-ray bursts at very high redshift. Although the numbers of GRBs known at z>6 remain few, even small samples can provide information about early star…
Inferring the Andromeda Galaxy's mass from its giant southern stream with Bayesian simulation sampling
Mark A. Fardal, Martin D. Weinberg, Arif Babul +8
M31 has a giant stream of stars extending far to the south and a great deal of other tidal debris in its halo, much of which is thought to be directly associated with the southern…
Hubble Space Telescope observations of the afterglow, supernova and host galaxy associated with the extremely bright GRB 130427A
A. J. Levan, N. R. Tanvir, A. S. Fruchter +13
We present Hubble Space Telescope (HST) observations of the exceptionally bright and luminous Swift gamma-ray burst, GRB 130427A. At z=0.34 this burst affords an excellent opportun…
The Afterglow of GRB 130427A from 1 to 10^16 GHz
D. A. Perley, S. B. Cenko, A. Corsi +31
We present multiwavelength observations of the afterglow of GRB 130427A, the brightest (in total fluence) gamma-ray burst of the past 29 years. Optical spectroscopy from Gemini-Nor…
SN 2007uy - metamorphosis of an aspheric Type Ib explosion
Rupak Roy, Brijesh Kumar, Justyn R. Maund +13
The supernovae of Type Ibc are rare and the detailed characteristics of these explosions have been studied only for a few events. Unlike Type II SNe, the progenitors of Type Ibc ha…
Light from the Cosmic Frontier: Gamma-Ray Bursts
L. Amati, J. -L. Atteia, L. Balazs +41
Gamma-Ray Bursts (GRBs) are the most powerful cosmic explosions since the Big Bang, and thus act as signposts throughout the distant Universe. Over the last 2 decades, these ultra-…
The Hot and Energetic Universe: Luminous extragalactic transients
Peter Jonker, Paul O'Brien, Lorenzo Amati +11
We discuss the importance and potential contribution of Athena+ to the science questions related to gamma-ray bursts, tidal disruption events and supernova shock break-out. Athena+…
The low-extinction afterglow in the solar-metallicity host galaxy of gamma-ray burst 110918A
J. Elliott, T. Krühler, J. Greiner +21
Metallicity is theoretically thought to be a fundamental driver in gamma-ray burst (GRB) explosions and energetics, but is still, even after more than a decade of extensive studies…
A "kilonova" associated with short-duration gamma-ray burst 130603B
N. R. Tanvir, A. J. Levan, A. S. Fruchter +4
Short-duration gamma-ray bursts (SGRBs) are intense flashes of cosmic gamma-rays, lasting less than ~2 s, whose origin is one of the great unsolved questions of astrophysics today.…