Long gamma-ray bursts without visible supernovae: a case study of redshift estimators and alleged novel objects

Details Long gamma-ray bursts without visible supernovae: a case study of redshift estimators and alleged novel objects Long gamma-ray bursts without visible supernovae: a case study of redshift estimators and alleged novel objects

2006-11-06

arxiv.org/abs/astro-ph/0611161v4

Astrophys.J.678:353-359,2008

Astronomy and Astrophysics

Astrophysics

19 pages, 2 figures. To be published in ApJ

Scientific paper

10.1086/528673

It has been argued that the observational limits on a supernova (SN) associated with GRB060614 convincingly exclude a SN akin to SN1998bw as its originator, and provide evidence for a new class of long-duration GRBs. We discuss this issue in the contexts of indirect 'redshift estimators' and of the fireball and cannonball models of GRBs. The latter explains the unusual properties of GRB060614: at its debated but favoured low redshift (0.125) they are predicted, as opposed to exceptional, if the associated core-collapse SN is of a recently discovered, very faint type. We take the occasion to discuss the 'association' between GRBs and SNe.

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