Early Science Results from the USA Experiment

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The USA Experiment is an X-ray timing experiment with large collecting area and microsecond time resolution, capable of conducting a broad program of studies of galactic X-ray sources. It is one of nine experiments aboard the Advanced Research and Global Observation Satellite which was launched February 23, 1999. USA is a collimated proportional counter X-ray telescope with about 1000 cm2 of effective area per detector with two detectors, sensitive to photons in the energy range 1-15 keV. USA is investigating phenomena such as kHz QPOs recently discovered in some X-ray binaries, coherent millisecond periodicities in X-ray bursts, rapid variability in black hole systems, precise absolute timing of both rotation and accretion powered X-ray pulsars, and other topics. Substantial observing time has been obtained on Cyg X-1, PSR B1509-58, Aql X-1, Cen X-3, X1630-472, Cyg X-2, X1636-536, GX 1+4, 1E2259+586, X1820-30, X1630-472, 1E1048.1-5937, GRS1915+105, and Cas A, among others. We will present an overview of the USA status, capabilities and scientific observing plan as well as preliminary results from early science observations.

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