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   PR # 42080
   The unusual morphology of the supernova remnant 3C400.2 suggests that
   it may consist of a SNR re-energizing an existing cavity created by
   an earlier SNR. High resolution radio images show two interacting
   shells, while the Einstein IPC and the ROSAT PSPC images reveal X-ray
   emission from the entire interior of the two remnants, with a peak
   near their interaction. Optical images also exhibit enhanced emission
   in this area. ASCA SIS observations of 3C400.2 will provide
   information on temperature variation, ionization state and elementary
   abundances, and assist to explain the unusual morphology of the SNR.
   3C400.2 was observed in AO3 with 4CCD mode, but was out of the field
   of view because of a pointing error. Here we are proposing another
   ASCA observation of 3C400.2 with 2CCD mode.
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