HETE-2 Observation of two gamma-ray bursts at z > 3
Abstract
GRB 020124 and GRB 030323 constitute half the sample of gamma-ray bursts with a measured redshift greater than 3. This paper presents the temporal and spectral properties of these two gamma-ray bursts detected and localized with HETE-2. While they have nearly identical redshifts (z=3.20 for GRB 020124, and z=3.37 for GRB 030323), these two GRBs span about an order of magnitude in fluence, thus sampling distinct regions of the GRB luminosity function. The properties of these two bursts are compared with those of the bulk of the GRB population detected by HETE-2. We also discuss the energetics of GRB 020124 and GRB 030323 and show that they are compatible with the Epeak - Eiso relation discovered by Amati et al. (2002). Finally, we compute the maximum redshifts at which these bursts could have been detected by HETE-2 and we address various issues connected with the detection and localization of high-z GRBs.
Cite
@article{arxiv.astro-ph/0502494,
title = {HETE-2 Observation of two gamma-ray bursts at z > 3},
author = {J. -L. Atteia and N. Kawai and R. Vanderspek and G. Pizzichini and G. R. Ricker and C. Barraud and M. Boer and J. Braga and N. Butler and T. Cline and G. B. Crew and J. -P. Dezalay and T. Q. Donaghy and J. Doty and E. E. Fenimore and M. Galassi and C. Graziani and K. Hurley and J. G. Jernigan and D. Q. Lamb and A. Levine and R. Manchanda and F. Martel and M. Matsuoka and E. Morgan and Y. Nakagawa and J. -F. Olive and G. Prigozhin and T. Sakamoto and R. Sato and Y. Shirasaki and M. Suzuki and K. Takagishi and T. Tamagawa and K. Torii and J. Villasenor and S. E. Woosley and M. Yamauchi and A. Yoshida},
journal= {arXiv preprint arXiv:astro-ph/0502494},
year = {2009}
}
Comments
19 pages, 4 figures, submitted to ApJ