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

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arxiv 1405.5366 v1 pith:535IKJZ3 submitted 2014-05-21 astro-ph.HE astro-ph.GA

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
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J. Greiner M. R. G. McKenzie E. Palazzi S. Schmidl
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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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