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Two Type Ic supernovae in low-metallicity, dwarf galaxies: diversity of explosions
D. R. Young, S. J. Smartt, S. Valenti +15
We present BVRI photometry and optical spectroscopy of two Type Ic supernovae SN 2007bg and SN 2007bi discovered in wide-field, non-targeted surveys and associated with sub-luminou…
Deep Gemini/GMOS imaging of an extremely isolated globular cluster in the Local Group
A. D. Mackey, A. M. N. Ferguson, M. J. Irwin +7
We report on deep imaging of a remote M31 globular cluster, MGC1, obtained with Gemini/GMOS. Our colour-magnitude diagram for this object extends ~5 magnitudes below the tip of the…
The remnants of galaxy formation from a panoramic survey of the region around M31
Alan W. McConnachie, Michael J. Irwin, Rodrigo A. Ibata +26
In hierarchical cosmological models, galaxies grow in mass through the continual accretion of smaller ones. The tidal disruption of these systems is expected to result in loosely b…
Limits on Radioactive-Powered Emission Associated With a Short-Hard GRB 070724A in a Star-Forming Galaxy
Daniel Kocevski, Christina C Thone, Enrico Ramirez-Ruiz +10
We present results of an extensive observing campaign of the short duration, hard spectrum gamma-ray burst (GRB) 070724A, aimed at detecting the radioactively-powered emission that…
Multi-wavelength observations of the energetic GRB 080810: detailed mapping of the broadband spectral evolution
K. L. Page, R. Willingale, E. Bissaldi +31
GRB 080810 was one of the first bursts to trigger both Swift and the Fermi Gamma-ray Space Telescope. It was subsequently monitored over the X-ray and UV/optical bands by Swift, in…
Low-Resolution Spectroscopy of Gamma-ray Burst Optical Afterglows: Biases in the Swift Sample and Characterization of the Absorbers
J. P. U. Fynbo, P. Jakobsson, J. X. Prochaska +39
(Abridged). We present a sample of 77 optical afterglows (OAs) of Swift detected GRBs for which spectroscopic follow-up observations have been secured. We provide linelists and equ…
A new analysis of the short-duration, hard-spectrum GRB 051103, a possible extragalactic SGR giant flare
K. Hurley, A. Rowlinson, E. Bellm +34
GRB 051103 is considered to be a candidate soft gamma repeater (SGR) extragalactic giant magnetar flare by virtue of its proximity on the sky to M81/M82, as well as its time histor…
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…
The Discovery of Remote Globular Clusters in M33
A. Huxor, A. M. N. Ferguson, M. K. Barker +5
We present the discovery of four remote star clusters in M33, one of which is of an extended nature. Three of the clusters were discovered using survey data from the Isaac Newton T…
Unusually High Metallicity Host Of The Dark LGRB 051022
J. F. Graham, A. S. Fruchter, L. J. Kewley +5
We present spectroscopy of the host of GRB 051022 with GMOS nod and shuffle on Gemini South and NIRSPEC on Keck II. We determine a metallicity for the host of log(O/H)+12 = 8.77 us…
A spectroscopic survey of EC4, an Extended Cluster in Andromeda's halo
M. L. M. Collins, S. C. Chapman, M. Irwin +8
We present a spectroscopic survey of candidate red giant branch stars in the extended star cluster, EC4, discovered in the halo of M31 from our CFHT/MegaCam survey, overlapping the…
An HST/ACS View of the Inhomogeneous Outer Halo of M31
J. C. Richardson, A. M. N. Ferguson, A. D. Mackey +6
We present a high precision photometric view of the stellar populations in the outer halo of M31, using data taken with the Hubble Space Telescope Advanced Camera for Surveys (HST/…
Rise and fall of the X-ray flash 080330: an off-axis jet?
C. Guidorzi, C. Clemens, S. Kobayashi +31
X-ray flashes (XRFs) are a class of gamma-ray bursts (GRBs) with the peak energy of the time-integrated spectrum, Ep, below 30 keV, whereas classical GRBs have Ep of a few hundreds…
Evidence for energy injection and a fine-tuned central engine at optical wavelengths in GRB 070419A
A. Melandri, C. Guidorzi, S. Kobayashi +13
We present a comprehensive multiwavelength temporal and spectral analysis of the FRED GRB 070419A. The early-time emission in the -ray and X-ray bands can be explained by a cent…
Discovery of a large and bright bow shock nebula associated with low mass X-ray binary SAX J1712.6-3739
K. Wiersema, D. M. Russell, N. Degenaar +6
In a multiwavelength program dedicated to identifying optical counterparts of faint persistent X-ray sources in the Galactic Bulge, we find an accurate X-ray position of SAX J1712.…
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…
A Keck/DEIMOS spectroscopic survey of the faint M31 satellites And XV and And XVI
B. Letarte, S. C. Chapman, M. Collins +7
We present the results of a spectroscopic survey of the recently discovered M31 satellites And XV and And XVI, lying at projected distances from the centre of M31 of 93 and 130 kpc…