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   72077
   G156.2+5.7 is an unusual SNR. The first SNR discovered by ROSAT, it
   appears as a nearly complete X-ray shell with diameter 108'. It has by
   far the lowest radio surface brightness of any Galactic SNR. It is
   thought to be an old SNR, expanding into very low density ISM. Ginga
   observations, however, revealed a hard spectral component (kT=8 keV).
   ASCA data of a small portion of the SNR indicate strong kT, NH and
   abundance variations, but do not show the hard component. We propose 4
   pointings at positions complementary to the existing ones, with the
   goal of mapping spectral variations and locating and characterizing the
   hard component. This component, if thermal, could represent emission
   from the forward shock; if nonthermal, it could be the signature of
   cosmic ray acceleration.
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