Physics
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aipc..727..503p&link_type=abstract
GAMMA-RAY BURSTS: 30 YEARS OF DISCOVERY: Gamma-Ray Burst Symposium. AIP Conference Proceedings, Volume 727, pp. 503-507 (2004).
Physics
2
Gamma-Ray Sources, Gamma-Ray Bursts, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Intergalactic Matter, Quasar Absorption And Emission-Line Systems, Lyman Forest
Scientific paper
If the progenitors of gamma-ray bursts (GRBs) are massive stars, then we expect the GRB rate to follow the cosmic star formation rate at least to moderate redshifts. Here we attempt to quantify selection effects in the measurement of GRB redshifts as a function of the GRB energy release, afterglow luminosity and redshift. We apply these to a sample of 24 GRBs with optical afterglows and measured redshifts, and present the resultant measurement of the GRB rate over 0.2 < z < 5. The GRB rate density evolution is consistent with measurements of the UV luminosity density. Our simulations predict that approximately 50% of searches for optical afterglows result in a nondetection, which is broadly consistent with the observed rate of ``dark bursts''. We finally apply our simulations to the case of the Swift satellite mission and show that small robotic telescope projects may be able to identify ~ 1 GRB beyond z > 7 during the 3 year Swift mission. This rate is largely limited by the relatively poor sensitivity in the near-infrared, but may be increased if small telescopes are coupled with more sensitive NIR imaging in order to uncover a larger fraction of GRBs beyond the most distant known objects at z > 6.5.
Price Paul A.
Schmidt Brian P.
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