The star-formation rate in the host of GRB 990712

Details The star-formation rate in the host of GRB 990712 The star-formation rate in the host of GRB 990712

2001-10-25

arxiv.org/abs/astro-ph/0110547v1

Astronomy and Astrophysics

Astrophysics

A&A Letters, in press, 5 pages; a high-resolution color gif version of the paper figure is also supplied

Scientific paper

10.1051/0004-6361:20011484

We have observed the host galaxy of GRB 990712 at 1.4 GHz with the Australia Telescope Compact Array, to obtain an estimate of its total star-formation rate. We do not detect a source at the position of the host. The 2 sigma upper limit of 70 microJy implies that the total star-formation rate is lower than 100 Msun/yr, using conservative values for the spectral index and cosmological parameters. This upper limit is in stark contrast with recent reports of radio/submillimeter-determined star-formation rates of roughly 500 Msun/yr for two other GRB host galaxies. Our observations present the deepest radio-determined star-formation rate limit on a GRB host galaxy yet, and show that also from the unobscured radio point-of-view, not every GRB host galaxy is a vigorous starburst.

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