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   PR #    15
   W49B is classified as a plerion type SNR with a diameter about 4
   arcmin. Itsemission is from a thin thermal emission with a temperature
   about 2.8 keV thatis the typical emission from the shell type SNR. The
   spatial structure isquite similar to that of the Crab type SNR. This
   descrepancy can beunderstood with the fact the interstellar absorption
   feature is about 22.5.We can see the emission from the interior while
   that from the rims is heavilyabsorbed. We will be able study the hot
   interior of the SNR. W49B is alsoknown to have a strong iron line with
   an equivalent width about 4.7 keV ! Theexpected counting rate from the
   iron line is about 0.1 counts/sec/SIS. Otheremission lines like Ar,
   Ca, S, Si,.. down to O can be expected with the SIS. We expect the GIS
   to look for t
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