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Using the EXIST Active Shields for Earth Occultation Observations of X-Ray SourcesThe EXIST active shields, now being planned for the main detectors of the coded aperture telescope, will have approximately 15 times the area of the BATSE detectors; and they will have a good geometry on the spacecraft for viewing both the leading and training Earth's limb for occultation observations. These occultation observations will complement the imaging observations of EXIST and can extend them to higher energies. Earth occultatio observations of the hard X-ray sky with BATSE on the Compton Gamma Ray Observatory developed and demonstrated the capabilities of large, flat, uncollimated detectors for this method. With BATSE, a catalog of 179 X-ray sources was monitored twice every spacecraft orbit for 9 years at energies above about 25 keV, resulting in 83 definite detections and 36 possible detections with 5-sigma detection sensitivities of 3.5-20 mcrab (20-430 keV) depending on the sky location. This catalog included four transients discovered with this technique and many variable objects (galactic and extragalactic). This poster will describe the Earth occultation technique, summarize the BATSE occultation observations, and compare the basic observational parameters of the occultation detector elements of BATSE and EXIST.
Document ID
20050092400
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Wilson, Colleen A.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Fishman, Gerald
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Hong, Jae-Sub
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Gridlay, Jonathan
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Krawczynski, Henric
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 22, 2013
Publication Date
January 1, 2005
Subject Category
Astronomy
Meeting Information
Meeting: 205th Meeting of the American Astronomical Society
Location: San diego, CA
Country: United States
Start Date: January 9, 2005
End Date: January 13, 2005
Sponsors: American Astronomical Society
Distribution Limits
Public
Copyright
Other

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