Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007sf2a.conf..210p&link_type=abstract
SF2A-2007: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics held in Grenoble, France, July
Astronomy and Astrophysics
Astrophysics
Scientific paper
Gamma-Ray Bursts constitute the most powerful explosions in the Universe and seem to be, for most of them, associated with the death of massive stars. Using the data collected during the 6-year mission of the High Energy Transient Explorer II satellite on a complete sample of 82 GRBs, we study the intrinsic energetic properties of these transient events. The results obtained lead to a discussion on X-ray flashes, which is a GRB sub-population softer than the average population. We show that the HETE-2 XRFs are not soft due to their high redshift and that half of them are not classified as XRFs anymore if we compute their energetics' properties in the source frame, confirming the results of previous studies. We also derive the rate of GRBs occuring in the Local Universe and obtain a higher rate than previous studies. In particular, the study of the intrinsic properties shows the predominence of the XRFs in the GRBs population, that we link with the higher local rate we found.
Atteia Jean-Luc
Hete-2 Science Team
Pélangeon Alexandre
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