2009

The Collimation and Energetics of the Brightest Swift Gamma-Ray Bursts

Cenko, S. B., Frail, D. A., Harrison, F. A. et al.

Understand

Long-duration gamma-ray bursts (GRBs) are widely believed to be highly-collimated explosions (opening angle theta ~ 1-10 deg).

As a result of this beaming factor, the true energy release from a GRB is usually several orders of magnitude smaller than the observed isotropic value.
Measuring this opening angle, typically inferred from an achromatic steepening in the afterglow light curve (a "jet" break), has proven exceedingly difficult in the Swift era.
Here we undertake a study of five of the brightest (in terms of the isotropic prompt gamma-ray energy release, E(gamma, iso)) GRBs in the Swift era to search for jet breaks and hence constrain the collimation-corrected energy release.

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