A short gamma-ray burst apparently associated with an elliptical galaxy at redshift z=0.225

Article Abstract:

The detection of the X-ray afterglow from and the localization of the short burst gamma-ray bursts (GRB) 050509B are reported. Its position at the sky is near a luminous, non-star-forming elliptical galaxy at a redshift of 0.225, which is a location that one would expect if the origin of this GRB were through the merger of neutron-star and black-hole barriers.

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An ultra-relativistic outflow from a neutron star accreting gas from a companion

Article Abstract:

Collimated relativistic outflows or jets are associated with supermassive black holes in distant active galactic nuclei, accreting stellar-mass black holes and neutron stars in binary systems. The discovery of an ultra-relativistic outflow from a neutron star accreting gas within a binary stellar system is reported.

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