Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio Constraints on Heavily-Obscured Star-Formation within Dark
  Gamma-Ray Burst Host Galaxies   Highly dust-obscured starbursting galaxies (submillimeter galaxies and their
ilk) represent the most extreme sites of star-formation in the distant universe
and contribute significantly to overall cosmic star-formation beyond z>1.5.
Some stars formed in these environments may also explode as GRBs and contribute
to the population of "dark" bursts. Here we present VLA wideband
radio-continuum observations of 15 heavily dust-obscured Swift GRBs to search
for radio synchrotron emission associated with intense star-formation in their
host galaxies. Most of these targets (11) are not detected. Of the remaining
four objects, one detection is marginal and for two others we cannot yet rule
out the contribution of a long-lived radio afterglow. The final detection is
secure, but indicates a star-formation rate roughly consistent with the
UV-inferred value. Most galaxies hosting obscured GRBs are therefore not
forming stars at extreme rates, and the amount of optical extinction seen along
a GRB afterglow sightline does not clearly correlate with the likelihood that
the host has a sufficiently high star-formation rate to be radio-detectable.
While some submillimeter galaxies do readily produce GRBs, these GRBs are often
not heavily obscured - suggesting that the outer (modestly obscured) parts of
these galaxies overproduce GRBs and the inner (heavily obscured) parts
underproduce GRBs relative to their respective contributions to star-formation,
hinting at strong chemical or IMF gradients within these systems.

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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: q-alg
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The categories of this paper are: cmp-lg
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The categories of this paper are: plasm-ph
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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: math
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: math-ph