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rdac:C10001 bibo:Article

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n14:astronomicalinstrumentation n15:surveys n15:gammaraysobservations n15:methodsdataanalysis

dcterms:title

Gamma-ray all-sky imaging with the Burst and Transient Source Experiment

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2004-01-01

rdaw:P10072

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dcterms:abstract

The BATSE mission aboard CGRO monitored the whole sky in the 20 keV-1 MeV energy band continuously from April 1991 until June 2000. Although BATSE had very poor intrinsic angular resolution, the data can be used to survey the entire soft gamma-ray sky with < $1^{\circ}$ angular resolution and ~mCrab sensitivity by using the Earth occultation method. This method determines flux by measuring the step in the count rate profile in each BATSE detector as a source rises above or sets below the Earth's limb. A maximum likelihood imaging technique can then be used to build up all-sky maps from the images of the Earth's limb produced by occulting sources. However, since the Earth seen from BATSE has a radius of ~70°, the limb images that intersect at the positions of bright point sources have a significant effect over the area of the all-sky map. A method for performing image cleaning on likelihood data has also been developed and is used to effectively remove artefacts from the all-sky maps. This paper describes the “LIMBO” imaging technique and presents preliminary all-sky maps of 25-160 keV emission, the first to be made since the HEAO1-A4 mission of 1978-79.


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aa0026

dcterms:dateCopyrighted

2004-01-01

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© ESO, 2004

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ESO

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