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We present a catalog of 2-10 keV ASCA Gas Imaging Spectrometer images of fields containing bright sources of GeV emission. The images cover ∼85% of the 95% confidence position contour for 28 of the 30 sources with >1 GeV fluxes above 4 × 10 -8 ph cm -2 s -1 . We find an excess of hard X-ray sources with F 2-10keV ≳ 10 -12 ergs cm -2 s -1 positionally coincident with unidentified sources of GeV emission. We comment on radio-loud and radio-quiet pulsar candidates, as well as several SNRs and massive binaries as possible sources of the GeV emission. We also find evidence for a class of variable γ-ray sources associated with extended regions of hard X-ray emission, and propose that for these sources, a significant percentage of the γ-ray emission is generated in synchrotron nebulae surrounding fast, young pulsars.
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