GRB Energetics in the Swift Era

Details GRB Energetics in the Swift Era GRB Energetics in the Swift Era

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1801k&link_type=abstract

American Astronomical Society, AAS Meeting #211, #18.01; Bulletin of the American Astronomical Society, Vol. 39, p.768

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Scientific paper

We examine the rest frame energetics of 76 gamma-ray bursts (GRBs) with known redshift that were detected by the Swift spacecraft. Using the bolometric fluence values estimated in Butler et al. 2007 and the last XRT observation for each event, we set a lower limit to their collimation corrected energy Eg and find that a 68 of our sample are at high enough redshift and/or low enough fluence to accommodate a jet break occurring beyond the last XRT observation and still be consistent with the pre-Swift Eg distribution for long GRBs. We find that relatively few of the X-ray light curves for the remaining events show evidence for late-time decay slopes that are consistent with that expected from post jet break emission. The breaks in the X-ray light curves that do exist tend to be shallower and occur earlier than the breaks previously observed in optical light curves, yielding a Eg distribution that is far lower than the pre-Swift distribution. If these early X-ray breaks are not due to jet effects, then a small but significant fraction of our sample have lower limits to their collimation corrected energy that place them well above the pre-Swift Eg distribution. Either scenario would necessitate a much wider post-Swift Egamma distribution for long cosmological GRBs compared to the narrow standard energy deduced from pre-Swift observations.

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