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arxiv 0808.3377 v1 pith:WWGV7YDK submitted 2008-08-25 astro-ph

Cosmic X-ray background and Earth albedo Spectra with Swift/BAT

M. Ajello , J. Greiner , G. Sato , D. R. Willis , G. Kanbach , A. W. Strong , R. Diehl , G. Hasinger
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N. Gehrels C. B. Markwardt J. Tueller
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keywords earthspectrumalbedobackgroundmeasurementcosmicheao-1results
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We use Swift/BAT Earth occultation data at different geomagnetic latitudes to derive a sensitive measurement of the Cosmic X-ray background (CXB) and of the Earth albedo emission in the 15--200 keV band. We compare our CXB spectrum with recent (INTEGRAL, BeppoSAX) and past results (HEAO-1) and find good agreement. Using an independent measurement of the CXB spectrum we are able to confirm our results. This study shows that the BAT CXB spectrum has a normalization ~8(+/-3)% larger than the HEAO-1 measurement. The BAT accurate Earth albedo spectrum can be used to predict the level of photon background for satellites in low Earth and mid inclination orbits.

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