High-Resolution Chandra Observations of the Crab Nebula in Coincidence with the April Gamma-Ray Flares

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We have been using the ACIS-S detector aboard the Chandra X-Ray Observatory to attempt to pin down the precise location of the flaring from the Crab nebula seen at energies above 100 MeV by both Italy's AGILE Satellite and NASA's Fermi Gamma Ray Observatory. Chandra began observing the system on monthly intervals beginning six days after the discovery flare in September of 2010. These 5-ksec images were taken to establish a baseline for the nebula prior to the occurrence of another flare. Seven such images were taken including one that took place just before two major gamma-ray flaring events that peaked on April 14 and 16. The onset of the April flares triggered a sequence of five 10-ksec Chandra observations over a two week interval. Two of these observations were near the two gamma-ray peaks. We discuss the results of these observations and their implications.

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