Back to Search
Start Over
Intrinsic properties of a complete sample of HETE-2 gamma-ray bursts. A measure of the GRB rate in the Local Universe
- Source :
- Astron.Astrophys.491:157-171,2008
- Publication Year :
- 2008
-
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).<br />Comment: 20 pages, 14 figures, 3 tables (editor version: 15 pages, 14 figures, tables 2 and 3 only available in electronic form at http://www.aanda.org)
- Subjects :
- Astrophysics
Subjects
Details
- Database :
- arXiv
- Journal :
- Astron.Astrophys.491:157-171,2008
- Publication Type :
- Report
- Accession number :
- edsarx.0811.3304
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1051/0004-6361:200809709