Could GRB 060614 and its presumed host galaxy be a chance superposition?

Details Could GRB 060614 and its presumed host galaxy be a chance superposition? Could GRB 060614 and its presumed host galaxy be a chance superposition?

2006-08-30

arxiv.org/abs/astro-ph/0608678v4

Astrophys.J.651:L85-L88,2006

Astronomy and Astrophysics

Astrophysics

Accepted by ApJ Letters

Scientific paper

10.1086/509724

The lack of an observed supernova associated with GRB 060614 appears to require a new paradigm for the formation of (a subset of) long-duration GRBs. This requirement is based on the presumed low redshift of the burst, which was inferred from the spatial coincidence of the afterglow with a z=0.125 galaxy. We explore the possibility that this low-redshift galaxy is a chance superposition along the line of sight to GRB 060614. We examine the galaxy distribution of the field of GRB 060614 and find that the probability of a chance association with a galaxy at least as bright as the putative host is only ~ 0.5 - 1.9%. However, for the current ensemble of ~180 Swift GRBs it is likely that several such coincidences have occurred, and given the "non-standard" nature of GRB 060614 it is not implausible that this is one such occurrence. Thus the conclusion that GRB 060614 requires a revision to the formation paradigm for long-duration GRBs should be approached with caution.

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