Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1000...80v&link_type=abstract
GAMMA-RAY BURSTS 2007: Proceedings of the Santa Fe Conference. AIP Conference Proceedings, Volume 1000, pp. 80-83 (2008).
Astronomy and Astrophysics
Astronomy
1
Gamma-Ray Sources (Astronomical), Red Shift, Astronomical Telescopes
Scientific paper
There are both practical and scientific reasons to improve the selection efficiency of high-redshift GRBs. We show how rapidly available data from the Swift telescopes can be used to separate high-redshift (z>5) from lower-redshift bursts. All three Swift instruments provide useful data for this purpose. Specifically, the BAT burst duration T90, peak photon flux, fluence, photon index, XRT excess HI column density ΔN(HI), and UVOT initial magnitudes, individually have power to distinguish between high and low-redshift GRBs. In combination, these parameters can be used to substantially improve the efficiency of selecting z>5 burst candidates, without greatly reducing the high-redshift sample completeness. Applying these Swift high-redshift filters would result in the identification of approximately 12% of all Swift GRBs as high-redshift candidates. A set of high-redshift candidates without spectroscopic redshifts is presented.
Grupe Dirk
Koch Scott
Racusin Judith
Roming Pete
Vanden Berk Daniel E.
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