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Different progenitors of short hard gamma-ray bursts
release_wsergs6lxbdyjhqxtagnahzgkm
by
Eleonora Troja,
Andrew R. King,
Paul T. O'Brien,
Nicola Lyons,
and
Giancarlo Cusumano
Released
as a article
.
2007
Abstract
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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0711.3034v1
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