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arXiv · 1405.5366

Another short-burst host galaxy with an optically obscured high star formation rate: The case of GRB 071227

A. Nicuesa Guelbenzu·S. Klose·M. J. Michalowski·S. Savaglio·D. A. Kann·A. Rossi·L. K. Hunt·J. Gorosabel·J. Greiner·M. R. G. McKenzie·E. Palazzi·S. Schmidl
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Abstract

We report on radio continuum observations of the host galaxy of the short gamma-ray burst 071227 (z=0.381) with the Australia Telescope Compact Array (ATCA). We detect the galaxy in the 5.5 GHz band with an integrated flux density of Fnu = 43 +/- 11 microJy, corresponding to an unobscured star-formation rate (SFR) of about 24 Msun/yr, forty times higher than what was found from optical emission lines. Among the ~30 well-identified and studied host galaxies of short bursts this is the third case where the host is found to undergo an episode of intense star formation. This suggests that a fraction of all short-burst progenitors hosted in star-forming galaxies could be physically related to recent star formation activity, implying a relatively short merger time scale.

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A. Nicuesa Guelbenzu, S. Klose, M. J. Michalowski, S. Savaglio, D. A. Kann, A. Rossi, L. K. Hunt, J. Gorosabel, J. Greiner, M. R. G. McKenzie, E. Palazzi, S. Schmidl. 2014-05-21. Another short-burst host galaxy with an optically obscured high star formation rate: The case of GRB 071227. https://doi.org/10.1088/0004-637x/789/1/45

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