Earth Occultation Monitoring of the Hard X-ray/Low-Energy Gamma Ray Sky with BATSE

Details Earth Occultation Monitoring of the Hard X-ray/Low-Energy Gamma Ray Sky with BATSE Earth Occultation Monitoring of the Hard X-ray/Low-Energy Gamma Ray Sky with BATSE

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.0705z&link_type=abstract

American Astronomical Society, HEAD meeting #12, #7.05

Astronomy and Astrophysics

Astronomy

Scientific paper

Earth occultation provides a means of monitoring the highly variable x-ray/gamma-ray sky over various timescales with non-imaging detectors. As been demonstrated with the Burst And Transient Source Experiment (BATSE) on the Compton Gamma Ray Observatory (CGRO), and the Gamma-ray Burst Monitor (GBM) instrument on the Fermi mission, the standard approach to Earth occultation permits monitoring sources with a prede fined input catalog of source positions. An incomplete catalog, however, has been shown to result in increased systematic errors. In order to find unknown sources, an indirect imaging method has been developed and applied to the archival BATSE data. Differences in count rates in a detector that occur when a source moves into or out of eclipse result in occultation steps. A differential filter transforms these steps into gaussian-like features corresponding to the intensities measured from each pixel in the sky. Coupling this to the 51-day precession cycle of the CGRO orbit (with 28.5 degree inclination) makes it possible to perform an all-sky survey. By applying standard image deconvolution techniques, it becomes possible to locate known and unknown sources with 0.5 degree accuracy. Initial all-sky image results in the 23-98 keV energy band for 9 years of data from BATSE will be presented. The source identification with image deconvolution results will be discussed. This work is supported by NASA/Louisiana Board of Regents Cooperative Agreement NNX07AT62A.

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