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Hard X-ray all-sky imaging with BATSE/CGRO

The earth occultation transform imaging

Abstract

The large Area Detectors (LADs) of the BATSE experiment aboard the Compton Gamma-ray Observatory have been used recently as the first hard X-ray all-sky imager at energies between 20 keV and 300 keV. The Earth occultation process is formulated in terms of a curved Radon transform convoluted by a step transform in a selected field of view (FOV) ranging from 5°×5° to 40°×40°. The Maximum Entropy Method is then used to reconstruct an image in the hard X-ray sky. Multiple images of different regions of the sky can be produced simultaneously. A source location accuracy of 0.1° for strong sources and a sensitivity limit of 100 mCrab have been achieved in an one-day integration period.

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Invited Paper on “Imaging in High Energy Astronomy”, Sept., 1994, Capri, Italy

also Universities Space Research Association

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Zhang, S.N., Harmon, B.A., Fishman, G.J. et al. Hard X-ray all-sky imaging with BATSE/CGRO. Exp Astron 6, 57–62 (1995). https://doi.org/10.1007/BF00419258

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Key words

  • γ-rays
  • Imaging-Earth Occultation
  • Radon Transform
  • Maximum Entropy