Different progenitors of short hard gamma-ray bursts

Details Different progenitors of short hard gamma-ray bursts Different progenitors of short hard gamma-ray bursts

2007-11-19

arxiv.org/abs/0711.3034v1

Astronomy and Astrophysics

Astrophysics

5 pages, 2 figures, accepted for publication in MNRAS

Scientific paper

10.1111/j.1745-3933.2007.00421.x

We consider the spatial offsets of short hard gamma-ray bursts (SHBs) from their host galaxies. We show that all SHBs with extended duration soft emission components lie very close to their hosts. We suggest that NS-BH binary mergers offer a natural explanation for the properties of this extended duration/low offset group. SHBs with large offsets have no observed extended emission components and are less likely to have an optically detected afterglow, properties consistent with NS-NS binary mergers occurring in low density environments.

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