X-ray emission from supernova remnants near gamma-ray sources

The imaging proportional counter of the Einstein Observatory has been used to search for X-ray emission from eight radio supernova remnants which are near three of the Cos-B unidentified ..gamma..-ray sources; 2CG 311--01, CG 327--0, and CG 333+0. We observe emission from three of the remnants and upper limits on the remainder which are consistent with the luminosity expected from a simple blast-wave-heated plasma model of the process. Thus none of the remnants are superluminous as might be expected if they follow the pattern of the Crab Nebula. One of the remnants, RCW 103, may be Vela-like in that Tuohy and Garmire have recently reported a weak point source approximately centrally located which may be associated with a rotating neutron star remnant of the supernova explosion and which therefore may be associated with CG 333+0.