Variability of sub-mJy radio sources

Details Variability of sub-mJy radio sources Variability of sub-mJy radio sources

2003-02-25

arxiv.org/abs/astro-ph/0302528v1

Astrophys.J. 590 (2003) 192-196

Astronomy and Astrophysics

Astrophysics

aastex 2 postscript figures. to appear in the Astrophysical Journal

Scientific paper

10.1086/375005

We present 1.4 GHz VLA observations of the variability of radio sources in the Lockman Hole region at the level of > 100 uJy on timescales of 17 months and 19 days. These data indicate that the areal density of highly variable sources at this level is < 0.005 arcmin^{-2}. We set an upper limit of 2% to the fraction of 50 to 100uJy sources that are highly variable (> 50%). These results imply a lower limit to the beaming angle for GRBs of 1deg, and give a lower limit of 200 arcmin^2 to the area that can be safely searched for GRB radio afterglows before confusion might become an issue.

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