EDP Sciences
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Volume 380, Number 1, December II 2001
Page(s) L21 - L25
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20011484

A&A 380, L21-L25 (2001)
DOI: 10.1051/0004-6361:20011484

The star-formation rate in the host of GRB 990712

P. M. Vreeswijk1, R. P. Fender1, M. A. Garrett2, S. J. Tingay3, A. S. Fruchter4 and L. Kaper1

1  Astronomical Institute "Anton Pannekoek" , University of Amsterdam & Center for High Energy Astrophysics, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
2  Joint Institute for VLBI in Europe (JIVE), Postbus 2, 7990 AA, Dwingeloo, The Netherlands
3  Australia Telescope National Facility, Paul Wild Observatory, Locked Bag 194, Narrabri, NSW 2390, Australia
4  Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

(Received 13 August 2001 / Accepted 23 October 2001)

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 $\mu$Jy implies that the total star-formation rate is lower than 100 $M_{\odot}$ yr-1, 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 ~500 $M_{\odot}$ yr-1 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.

Key words: gamma rays: bursts -- radio continuum: galaxies -- stars: formation

Offprint request: P. M. Vreeswijk pmv@astro.uva.nl

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