Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2009-01-19
AIP Conf.Proc.1133:437-439,2009
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
3 pages; Submitted to Proceedings of Huntsville 2008 Symposium on GRBs
Scientific paper
10.1063/1.3155945
Being able to quickly select among gamma-ray bursts (GRBs) seen by the Swift satellite those which are high-z candidates would give ground-based observers a better chance to determine a redshift for such distant GRBs. Information about these high-z GRBs is important in helping to resolve questions about the early universe such as the formation rate of high-z GRBs, the re-ionization period of the universe, the metallicity of the early universe, and the Hubble expansion. Initially using a sample of 51 GRBs with previously measured redshifts, we have developed high-z screening criteria employing the GRB spectral as well as temporal characteristics of the prompt emission from the Burst Alert Telescope (BAT) on Swift. Now that the sample has increased to 81 GRBs, we have revisited the screening criteria and our methodology. Our updated high-z screening criteria are presented in this paper.
Barthelmy Scott D.
Dhuga Kalvir S.
Gehrels Neil
Parke William C.
Sakamoto Taka
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