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arXiv · 0811.3304

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

A. Pélangeon·J. -L. Atteia·Y. E. Nakagawa·K. Hurley·A. Yoshida·R. Vanderspek·M. Suzuki·N. Kawai·G. Pizzichini·M. Boër·J. Braga·G. Crew·T. Q. Donaghy·J. P. Dezalay·J. Doty·E. E. Fenimore·M. Galassi·C. Graziani·J. G. Jernigan·D. Q. Lamb·A. Levine·J. Manchanda·F. Martel·M. Matsuoka·J. -F. Olive·G. Prigozhin·G. R. Ricker·T. Sakamoto·Y. Shirasaki·S. Sugita·K. Takagishi·T. Tamagawa·J. Villasenor·S. E. Woosley·M. Yamauchi
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Abstract

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).

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A. Pélangeon, J. -L. Atteia, Y. E. Nakagawa, K. Hurley, A. Yoshida, R. Vanderspek, M. Suzuki, N. Kawai, G. Pizzichini, M. Boër, J. Braga, G. Crew, T. Q. Donaghy, J. P. Dezalay, J. Doty, E. E. Fenimore, M. Galassi, C. Graziani, J. G. Jernigan, D. Q. Lamb, A. Levine, J. Manchanda, F. Martel, M. Matsuoka, J. -F. Olive, G. Prigozhin, G. R. Ricker, T. Sakamoto, Y. Shirasaki, S. Sugita, K. Takagishi, T. Tamagawa, J. Villasenor, S. E. Woosley, M. Yamauchi. 2008-11-20. Intrinsic properties of a complete sample of HETE-2 gamma-ray bursts. A measure of the GRB rate in the Local Universe. https://doi.org/10.1051/0004-6361:200809709

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