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X-ray all-sky monitoring and transient detection using a coded sphere telescope

We present a design for a hard X-ray all-sky monitor which consists of a spherical structure whose surface is partially covered by circular units which serve the dual purpose of detector and mask elements, forming a coded aperture telescope with full 4 steradian coverage. We demonstrate that a simple practical implementation of this geometry results in an instrument which is capable of measuring the fluxes in the 10 20 keV bandpass of the hundred brightest sources in the sky at least every two days. We also show how this instrument can be used to image burst and transient sources; obtain their positions with arcminute accuracy; and follow their light curves throughout their lifetimes.