An origin for short g-ray bursts unassociated with current star formation

Details An origin for short g-ray bursts unassociated with current star formation An origin for short g-ray bursts unassociated with current star formation

2005-11-18

arxiv.org/abs/astro-ph/0511579v1

Nature 438:994,2005

Astronomy and Astrophysics

Astrophysics

11 pages of taxt plus figures (all in 1 file). Nature Letters (accepted; publish Dec 19, 2005)

Scientific paper

10.1038/nature04392

Two short (<2 s) g-ray bursts (GRBs) have recently been localized and fading afterglow counterparts detected. The combination of these two results left unclear the nature of the host galaxies of the bursts, because one was a star-forming dwarf, while the other was probably an elliptical galaxy. Here we report the X-ray localization of a short burst (GRB 050724) with unusual g-ray and X-ray properties. The X-ray afterglow lies off the centre of an elliptical galaxy at a redshift of z=0.258, coincident with the position determined by ground-based optical and radio observations. The low level of star formation typical for elliptical galaxies makes it unlikely that the burst originated n a supernova explosion. A supernova origin was also ruled out for GRB 050709, even though that burst took place in a galaxy with current star formation. The isotropic energy for the short bursts is 2-3 orders of magnitude lower han that for the long bursts. Our results therefore suggest that an alternative source of bursts -- the of binary systems of neutron stars or a neutron star-black hole pair -- are the progenitors of short bursts.

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