Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0906r&link_type=abstract
American Astronomical Society, HEAD meeting #11, #9.06; Bulletin of the American Astronomical Society, Vol. 41, p.668
Astronomy and Astrophysics
Astronomy
Scientific paper
Employing the 12 NaI detectors in the Fermi GBM, one can use the Earth Occultation Technique to locate and measure the flux of x-ray and gamma-ray sources. Each time a source passes behind the Earth (or emerges from behind the Earth), a step-like feature is produced in the detector count rate. Fermi's orbital precession permits the entire sky to be occulted every 55 days. The standard occultation analysis is based on searching for occultations using a catalog of known sources at predicted times. Passing the data through a differential filter amplifies the occultation step features while suppressing most of the background. Folding the data on a daily or weekly period then makes it possible to search for spikes in the differentiated data due to sources in addition to those in the standard occultation catalog. Initial results searching for new sources using this GBM differential filter analysis will be presented.
Beklen Elif
Bhat Narayan P.
Briggs Matthew
Camero-Arranz Ascencion
Case Gary L.
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