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GRB 050223: A dark GRB in a dusty starburst galaxy

Abstract : Aims: We aim at detecting and determining the properties of the host galaxy of the dark GRB 050223. Methods: We use VLT optical/NIR images coupled to Swift X-ray positioning, and optical spectra of the host galaxy to measure its properties. Results: We find a single galaxy within the Swift error box of GRB 050223. It is located at z = 0.584 and its luminosity is L ~ 0.4 L*. Emission lines in the galaxy spectrum imply an intrinsic SFR > 7 Msun/yr, and a large extinction A_V > 2 mag within it. We also detect absorption lines, which reveal an underlying stellar population with an age between 40 Myr and 1.5 Gyr. Conclusions: The identification of a host galaxy with atypical properties using only the X-ray transient suggests that a bias may be present in the former sample of host galaxies. Dust obscuration together with intrinsic faintness are the most probable causes for the darkness of this burst.
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http://hal.in2p3.fr/in2p3-00098294
Contributor : Dominique Girod <>
Submitted on : Monday, September 25, 2006 - 2:35:10 PM
Last modification on : Saturday, September 19, 2020 - 4:50:44 AM

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L.J. Pellizza, P.-A. Duc, E. Le Floc'H, I. F. Mirabel, L. A. Antonelli, et al.. GRB 050223: A dark GRB in a dusty starburst galaxy. Astronomy and Astrophysics - A&A, EDP Sciences, 2006, 459, pp.L5-L8. ⟨10.1051/0004-6361:20066015⟩. ⟨in2p3-00098294⟩

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