Search for Late Jet Breaks in X-ray Afterglows of Gamma-Ray Bursts

Details Search for Late Jet Breaks in X-ray Afterglows of Gamma-Ray Bursts Search for Late Jet Breaks in X-ray Afterglows of Gamma-Ray Bursts

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21714107b&link_type=abstract

American Astronomical Society, AAS Meeting #217, #141.07; Bulletin of the American Astronomical Society, Vol. 43, 2011

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Scientific paper

Gamma-ray bursts are the most energetic events known since the Big Bang. Because both the prompt emission and the afterglow of GRBs is highly beamed, determination of their actual explosion energies depends on measurement of the beaming angle, which can be estimated on the basis of the detection of an achromatic jet break in the light curve. Jet break measurements for Swift GRBs have been rare; as a result, we have undertaken a program of studying X-ray GRB afterglows using the Chandra observatory to obtain very late-time flux measurements. When compared with earlier Swift XRT flux measurements, these allow the measurements of late jet breaks in some bursts, and allow strict limits to be placed on jet break times in other cases. We will present a progress report on this work and its implication for GRB energetics.

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