GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short Burst Redshift

Details GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short Burst Redshift GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short Burst Redshift

2008-02-10

arxiv.org/abs/0802.1346v1

AIP Conf.Proc.1000:289-292,2008

Astronomy and Astrophysics

Astrophysics

Conference procedings for Gamma Ray Bursts 2007 November 5-9, 2007 Santa Fe, New Mexico (4 pages, 2 figures)

Scientific paper

10.1063/1.2943465

Gemini Nod & Shuffle spectroscopy on the host of the short GRB 070714B shows a single emission line at 7167 angstroms which, based on a grizJHK photometric redshift, we conclude is the 3727 angstrom [O II] line. This places the host at a redshift of z=.923 exceeding the previous record for the highest spectroscopically confirmed short burst redshift of z=.546 held by GRB 051221. This dramatically moves back the time at which we know short bursts were being formed, and suggests that the present evidence for an old progenitor population may be observationally biased.

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