The Beaming Factor and Other Open Questions In GRB Jets

Details The Beaming Factor and Other Open Questions In GRB Jets The Beaming Factor and Other Open Questions In GRB Jets

2005-02-23

arxiv.org/abs/astro-ph/0502473v3

Nuovo Cim.C28:373-380,2005

Astronomy and Astrophysics

Astrophysics

To appear in the proceedings of the Rome GRB meeting, Oct 2004. Typos corrected in the revised version

Scientific paper

10.1393/ncc/i2005-10063-y

I review several central open questions concerning GRB Jets. 1) I discuss a new estimates of the beaming correction for the rate of GRBs ~ 75 +- 20. 2) I discuss the universal structured jet (USJ) model and conclude that while jets might be structured they are less likely to be universal. 3) I discuss recent observations of a sideways expansion of a GRB afterglow and compare these with current hydrodynamics simulations of jet evolution. 4) I discuss the implications of resent outliers to the energy-angle relation.

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