Intrinsic properties of a complete sample of HETE-2 Gamma-ray bursts A measure of the GRB rate in the Local Universe
Intrinsic properties of a complete sample of HETE-2 Gamma-ray bursts A measure of the GRB rate in the Local Universe
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DOI：
10.1051/0004-6361:200809709
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发表时间：
2008-05
影响因子：
6.5
通讯作者：
A. P'elangeon;J. Atteia;Y. Nakagawa;K. Hurley;A. Yoshida;R. Vanderspek;M. Suzuki;N. Kawai
中科院分区：
文献类型：
--
作者：
A. P'elangeon;J. Atteia;Y. Nakagawa;K. Hurley;A. Yoshida;R. Vanderspek;M. Suzuki;N. Kawai
Aims: Taking advantage of the forthcoming Catalog of the HETE-2 mission, the aim of this paper is to evaluate the main properties of HETE-2 GRBs - the E_peak, the T_90 and the E_iso - in their source frames and to derive their unbiased distribution. Methods: We first construct a complete sample containing all the bursts localized by the WXM on-board HETE-2, which are selected with a uniform criterion and whose observed parameters can be constrained. We then derive the intrinsic E_peak, T_90 and E_iso distributions using their redshift when it is available, or their pseudo-redshift otherwise. We finally compute the number of GRB (N_Vmax) within the visibility volume (V_max) of each GRB, in order to derive a weight for each detected burst accounting both for the detection significance and the star formation history of the universe. Results: The unbiased distributions obtained clearly show the predominence of X-ray flashes (XRFs) in the global GRB population. We also derive the rate of local GRBs: R0^H2 > 11 Gpc-3 yr-1, which is intermediate between the local rate obtained by considering only the high-luminosity bursts (~1 Gpc-3 yr-1) and that obtained by including the low-luminosity bursts (>200 Gpc-3 yr-1).
