Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1002x&link_type=abstract
American Astronomical Society, AAS Meeting #211, #10.02; Bulletin of the American Astronomical Society, Vol. 39, p.742
Astronomy and Astrophysics
Astronomy
Scientific paper
The redshifts of long-duration Gamma-Ray Bursts (GRBs) remain an important issue, and unfortunately only 32% of GRBs have redshifts from optical spectroscopy. The redshifts for most of the remaining 68% can be determined with useful accuracy by means of the several luminosity relations, wherein some measurable light curve or spectral property (e.g., spectral lag or E_peak) is well correlated with the burst luminosity. The idea is to use these luminosity relations, along with some adopted cosmology, to measure the redshift of bursts without optical spectroscopy. This method has been proved by application to the bursts with spectroscopic redshifts, with the result that our average error in redshift is 26% and the spectroscopic redshifts falling inside our one-sigma range for 57% of the GRBs. We apply this same procedure to all long-duration Swift bursts up to May 2007 above a low brightness threshold. In this paper, we present our redshift catalog for approximately 210 Swift bursts, each with accurately propagated error bars. Our complete catalog can be used for various demographic studies (without the complex selection effects of optical spectroscopy).
Schaefer Bradley E.
Xiao Limin
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