Earth occultation imaging of the low energy gamma-ray sky with GBM

Abstract:

Aims. The Earth Occultation Technique (EOT) has been applied to Fermi’s Gamma-ray Burst Monitor (GBM) to perform all-sky monitoring for a predetermined catalog of hard X-ray/soft γ-ray sources. In order to search for sources not in the catalog, thus completing the catalog and reducing a source of systematic error in EOT, an imaging method has been developed–Imaging with a Differential filter using the Earth Occultation Method (IDEOM). Methods. IDEOM is a tomographic imaging method that takes advantage of the orbital precession of the Fermi satellite. Using IDEOM, all-sky reconstructions have been generated for~ 4 years of GBM data in the 12–50 keV, 50–100 keV and 100–300 keV energy bands in search of sources otherwise unmodeled by the GBM occultation analysis. Results. IDEOM analysis resulted in the detection of 57 sources in the 12–50 keV energy band, 23 sources in the 50–100 keV energy …

Año de publicación:

2014

Keywords:

Fuente:

google