GRB 070714B - Discovery of the Highest Spectroscopically Confirmed Short Burst Redshift
J. F. Graham (1, 2), A. S. Fruchter (1), A. J. Levan (3), M., Nysewander (1), N. R. Tanvir (4), T. Dahlen (1), D. Bersier (5), A. Pe'er (1), ((1) Space Science Telescope Institute, (2) Johns Hopkins University, (3), University of Warwick, (4) University of Leicester
TL;DR
This paper reports the discovery of the highest spectroscopically confirmed redshift for a short gamma-ray burst host galaxy at z=0.923, indicating such bursts occur earlier in cosmic history than previously confirmed.
Contribution
It provides the first spectroscopic confirmation of a short GRB host galaxy at a redshift exceeding 0.5, extending the known formation epoch of short bursts.
Findings
Short GRB host at z=0.923, the highest confirmed to date.
Evidence suggests short bursts can originate earlier in the universe than previously thought.
Implication that old progenitor populations may be observationally biased.
Abstract
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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