A Hard X-ray All Sky Survey using BATSE Earth Occultation Data

Details A Hard X-ray All Sky Survey using BATSE Earth Occultation Data A Hard X-ray All Sky Survey using BATSE Earth Occultation Data

Dec 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.4419s&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #44.19; Bulletin of the American Astronomical Society, Vol. 32, p.1654

Astronomy and Astrophysics

Astronomy

1

Scientific paper

The BATSE mission aboard CGRO can be used to observe hard x-ray sources by using the Earth occultation method. The sensitivity of the method has been improved by flat-fielding the response of hard x-ray and gamma ray detectors using a dynamic Monte-Carlo mass model developed at Southampton and described elsewhere in these proceedings. By subtracting the modelled data the BATSE background variations are reduced by about an order of magnitude, which allows better measurement of the occultation step sizes and hence better determination of the x-ray flux. A maximum likelihood imaging method can then be used to perform a sensitive all sky survey, in the ~20-300keV range. The 3σ flux sensitivity for a survey performed using 50 days of data from energy channel 2 of the CONTINUOUS data set is ~15 mCrab with an angular resolution of ~1o. Preliminary results, for a survey using part of the 9 year BATSE CONTINUOUS data set, are presented.

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