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X-RAY AND RADIO OBSERVATIONS OF BRIGHT GEV SOURCES

We present X-ray and radio studies of sources which are bright above 1 GeV (F>1GeV ≥ 4 × 10 ph cm s). Only 11 out of ∼ 30 of these γ−ray sources have been identified with lower energy counterparts: 5 blazars and 6 pulsars. Three of these pulsars are surrounded by radio pulsar wind nebulae (PWN), two of which are also seen as bright, extended X-ray synchrotron nebulae. The ASCA X-ray telescope has observed 28 of the bright GeV sources, revealing an excess of