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Wide-field (> 100 deg$^2$) hard X-ray coded-aperture telescopes with highangular resolution (< 2') will enable a wide range of time domain astrophysics.For instance, transient sources such as gamma-ray bursts can be preciselylocalized without assistance of secondary focusing X-ray telescopes to enablerapid followup studies. On the other hand, high angular resolution incoded-aperture imaging introduces a new challenge in handling the systematicuncertainty: average photon count per pixel is often too small to establish aproper background pattern or model the systematic uncertainty in a time scalewhere the model remains invariant. We introduce two new techniques to improvedetection sensitivity, which are designed for, but not limited to highresolution coded-aperture system: a self-background modeling scheme whichutilizes continuous scan or dithering operations, and a Poisson-statisticsbased probabilistic approach to evaluate the significance of source detectionwithout subtraction in handling the background. We illustrate these new imaginganalysis techniques in high resolution coded-aperture telescope using the dataacquired by the wide-field hard X-ray telescope ProtoEXIST2 during thehigh-altitude balloon flight in Fall, 2012. We review the imaging sensitivityof ProtoEXIST2 during the flight, and demonstrate the performance of the newtechniques using our balloon flight data in comparison with simulated idealPoisson background.

Imaging Analysis of the Hard X-ray Telescope ProtoEXIST2 and New Techniques for High Resolution Coded Aperture Telescopes