Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: GRB060614 is at High Redshift, So No New Class of Gamma-Ray Bursts is
  Required   Long duration Gamma-Ray Bursts (GRBs) have been strongly connected with core
collapse supernovae, so it was surprising when the recent GRB060614 (with a
reported redshift of 0.125) was found to have no visible supernova to deep
limits. Three separate groups have reached the same conclusion that this event
forces the existence of a new previously-unsuspected class of GRBs. The problem
with this conclusion is that the redshift is not secure, as the measured galaxy
emission lines simply give the redshift of the brightest galaxy near the
line-of-sight to the GRB afterglow. Fortunately, eight different luminosity
indicators are known which can give the luminosity (and hence redshift) of the
GRB itself. In combination, these luminosity indicators have already proven to
give redshifts with average one-sigma errors of 26% as based on 69 GRBs with
spectroscopic redshifts. For GRB060614, the luminosity indicators all uniformly
give a high luminosity for the burst which implies a high redshift. This can be
seen by the spiky many-peaked light curve, the high E_{peak} value, the
near-zero spectral lag, and the timing of the jet break. Quantitatively, we
derive a redshift of 1.97 (1.44<z<2.81 one-sigma) from the eight luminosity
indicators. Additional information from the detection of the afterglow in all
Swift UVOT bands further constrains the redshift to be <1.71, so the final
range of allowed redshift is 1.44<z<1.71, which readily explains why no
supernova was visible. Thus, GRB060614 is at high redshift and is certainly not
evidence for a new class of GRBs.

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The categories of this paper are: stat
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: physics
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
0
The categories of this paper are: hep-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: cs