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Remarkable Spectral Variability of PDS 456
Ehud Behar, Shai Kaspi, James Reeves +3
We report on the highest to date signal-to-noise-ratio X-ray spectrum of the luminous quasar PDS 456, as obtained during two XMM-Newton orbits in September 2007. The present spectr…
The spectral-temporal properties of the prompt pulses and rapid decay phase of GRBs
R. Willingale, F. Genet, J. Granot +1
The prompt emission from GRBs is the brightest electromagnetic emission known yet it's origin is not understood. The flux density of individual prompt pulses of a GRB can be repres…
Going out with a bang: compact object collisions resulting from supernovae in binary systems
Eleonora Troja, Graham A. Wynn, Paul T. O'Brien +1
Binary star systems containing a neutron star or a black hole with an evolved, massive star are dynamically perturbed when the latter undergoes a supernova explosion. It is possibl…
Are all short-hard gamma-ray bursts produced from mergers of compact stellar objects?
Francisco J. Virgili, Bing Zhang, Paul O'Brien +1
The origin and progenitors of short-hard gamma-ray bursts remain a puzzle and a highly debated topic. Recent Swift observations suggest that these GRBs may be related to catastroph…
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…
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 Compton-thick Wind in the High Luminosity Quasar, PDS 456
J. N. Reeves, P. T. O'Brien, V. Braito +7
PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observation in February 2007 revealed the complex, broad band X-ray spectrum of PDS…
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…
In search of progenitors for supernova-less GRBs 060505 and 060614: re-examination of their afterglows
D. Xu, R. L. C. Starling, J. P. U. Fynbo +6
GRB060505 and GRB060614 are nearby long-duration gamma-ray bursts (LGRBs) without accompanying supernovae (SNe) down to very strict limits. They thereby challenge the conventional…
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…