Intrinsic properties of a complete sample of HETE-2 gamma-ray bursts. A measure of the GRB rate in the Local Universe

A. Pélangeon (1) , J.-L. Atteia (1) , Y. E. Nakagawa (2, 3) , K. Hurley (4) , A. Yoshida (2, 3) , R. Vanderspek (5) , M. Suzuki (6) , N. Kawai (3, 7) , G. Pizzichini (8) , M. Boër (9) , José Braga (10) , G. Crew (5) , T. Q. Donaghy (11) , J. P. Dezalay (12) , J. Doty (5) , E. E. Fenimore (13) , M. Galassi (13) , C. Graziani (11) , J. G. Jernigan (4) , D. Q. Lamb (11) , A. Levine (5) , J. Manchanda (14) , F. Martel (5) , M. Matsuoka (6) , J.-F. Olive (12) , G. Prigozhin (5) , G. R. Ricker (5) , T. Sakamoto (15, 16, 17) , Y. Shirasaki (18) , S. Sugita (19) , K. Takagishi (20) , T. Tamagawa (3) , J. Villasenor (5) , S. E. Woosley (21) , M. Yamauchi (20)

1 LATT - Laboratoire Astrophysique de Toulouse-Tarbes
2 Department of Physics and Mathematics [Sagamihara]
3 RIKEN - RIKEN - Institute of Physical and Chemical Research [Japon]
4 SSL - Space Sciences Laboratory [Berkeley]
5 CSR - Center for Space Research [Cambridge]
6 TKSC - Tsukuba Space Center
7 Department of Physics [Tokyo]
8 IASF-Bo - Istituto di Astrofisica Spaziale e Fisica cosmica - Bologna
9 OHP - Observatoire de Haute-Provence
10 INPE - Instituto Nacional de Pesquisas Espaciais
11 Department of Astronomy and Astrophysics [Chicago]
12 CESR - Centre d'étude spatiale des rayonnements
13 LANL - Los Alamos National Laboratory
14 Department of Astronomy and Astrophysics [Bombay]
15 GSFC - NASA Goddard Space Flight Center
16 CRESST - Center for Research and Exploration in Space Science and Technology [GSFC]
17 Joint Center for Astrophysics
18 NAOJ - National Astronomical Observatory of Japan
19 Department of Physics
20 Faculty of Engineering
21 Department of Astronomy and Astrophysics [UCSC Santa Cruz]

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).

Mots clés: gamma rays: bursts; X-rays: bursts

Domaines: Cosmologie et astrophysique extra-galactique [astro-ph.CO]; Astrophysique [astro-ph]

A. Pélangeon, J.-L. Atteia, Y. E. Nakagawa, K. Hurley, A. Yoshida, et al.. Intrinsic properties of a complete sample of HETE-2 gamma-ray bursts. A measure of the GRB rate in the Local Universe. Astronomy and Astrophysics - A&A, 2008, 491, pp.157-171. ⟨10.1051/0004-6361:200809709⟩. ⟨hal-00340198⟩