The Evidence for Gamma-Ray Burst Jet Collimation from X-ray Afterglow Observations

Details The Evidence for Gamma-Ray Burst Jet Collimation from X-ray Afterglow Observations The Evidence for Gamma-Ray Burst Jet Collimation from X-ray Afterglow Observations

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560308r&link_type=abstract

American Astronomical Society, AAS Meeting #215, #603.08; Bulletin of the American Astronomical Society, Vol. 36, p.1126

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The extreme energy required to produce the observed emission of gamma-ray bursts is only physically reasonable if they are collimated into narrow jets. The multi-wavelength geometric signatures of collimation, jet breaks, are only present in a small fraction of afterglows and are rarely achromatic as expected. While this problem has been well explored with the existing data collected over the last 10 years, it is still an important issue fundamental to understanding the GRB phenomenon. In this poster, we explore a statistical study of X-ray jet breaks using afterglow observations from Swift-XRT and Chandra. We find a significant fraction of candidate “missed” jet breaks, and discuss outliers with interesting structure. We will speculate on the lack of achromatic jet breaks and the implications for the energetics.

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