Other
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe..23b&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Other
Supernova Remnants
Scientific paper
The Swift X-ray Telescope has now studied hundreds of X-ray afterglows of Gamma-Ray Bursts. One surprising finding is the apparent absence of jet breaks in the XRT light curves, suggesting that the Swift GRBs may have larger jet opening angles than those studied before the launch of Swift. We have undertaken a program of late-time observations of GRB afterglows by the Chandra X-ray Observatory to search for possible jet breaks at very late times, after the afterglow becomes too faint for Swift to monitor. These Chandra observations push the flux limits down by an order of magnitude, from ˜2E-14 cgs to ˜2E-15 cgs. I will report on the results of this on-going program, which has found very late jet breaks in some cases, and failed to find evidence of jet breaks to very late times in other afterglows. The results are consistent with the recent findings of Racusin et al., that suggest that some jet breaks occur at very late times but that the opening angles are typically still of order 5-10 degrees.
Bautz Marshall
Burrows David
Garmire Gordon
Grupe Dirk
Nousek John
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