EDP Sciences
Free access
Issue
A&A
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)

Abstract
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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