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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…
Simultaneous polarization monitoring of supernovae SN2008D/XT080109 and SN2007uy: isolating geometry from dust
J. Gorosabel, A. de Ugarte Postigo, A. J. Castro-Tirado +16
The possible existence of a continuum encompassing the diversity of explosive stellar deaths,ranging from ordinary SNe to relativistic hypernovae associated with long duration GRBs…
Early spectroscopic identification of SN 2008D
D. Malesani, J. P. U. Fynbo, J. Hjorth +27
SN 2008D was discovered while following up an unusually bright X-ray transient in the nearby spiral galaxy NGC 2770. We present early optical spectra (obtained 1.75 days after the…
Supernova 2006aj and the associated X-Ray Flash 060218
J. Sollerman, A. O. Jaunsen, J. P. U. Fynbo +23
We have studied the afterglow of the gamma-ray burst (GRB) of February 18, 2006. This is a nearby long GRB, with a very low peak energy, and is therefore classified as an X-ray Fla…
Is GRB 050904 a super-long burst?
Y. C. Zou, Z. G. Dai, D. Xu
By considering synchrotron radiative process in the internal shock model and assuming that all internal shocks are nearly equally energetic, we analyze the gamma-ray burst (GRB) em…
A New Relation between GRB Rest-Frame Spectra and Energetics and Its Utility on Cosmology
D. Xu
We investigate the well-measured spectral and energetic properties of 20 gamma-ray bursts (GRBs) in their cosmological rest frames. We find a tight relation between the isotropic-e…