SIMBAD references

2004ApJ...608L...9L - Astrophys. J., 608, L9-L12 (2004/June-2)

The peak energy distribution of the νFνspectra and the implications for the jet structure models of gamma-ray bursts.


Abstract (from CDS):

We study the peak energy (Ep) distribution of the νFνspectra of gamma-ray bursts (GRBs) and X-ray flashes (XRFs) with a sample of 57 bursts observed by High Energy Transient Explorer (HETE-2) French Gamma Telescope and discuss its implications for the jet structure models. Combining the observed Epdistribution of HETE-2 GRBs/XRFs with that of BATSE GRBs, we find that the observed Epdistribution of GRBs/XRFs is a bimodal one with peaks of ≲30 keV and ∼160-250 keV. According to the recently discovered equivalent-isotropic energy-Eprelationship, such a bimodal distribution implies a two-component structure of GRB/XRF jets. A simple simulation analysis shows that this structured jet model does roughly reproduce a bimodal distribution with peaks of ∼15 and ∼200 keV. We argue that future observations of the peak of ∼15 keV in the Epdistribution would be evidence supporting this model. Swift, which covers an energy band of 0.2-150 keV, is expected to provide a key test for our results.

Abstract Copyright:

Journal keyword(s): Gamma Rays: Bursts - Gamma Rays: Observations - ISM: Jets and Outflows - Methods: Statistical

Simbad objects: 14

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