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   PR # 21069
    SN1987A is providing us with a unique opportunity to study a supernov
    a remnant in their very early phase of evolution.  Recently, ROSAT de
    tected soft X-rays  from the SN.  Origin of the emission is probably 
    the shock formed by the  colliding ejecta and the wind remnant of the
    progenitor. Increase of the radio  flux being observed since 1990 is 
    probably from the same origin. Primary goal  of this ASCA observation
    is to independently confirm the X-ray emission, and  put better const
    raint on the spectrum taking advantage of its wider band pass.  ASCA 
    observed the SN in the PV phase, and obtained flux upper limit of ~5x
    10-14 erg/cm2 sec.  This time, we propose longer exposure. Search for
    the emission from the central pulsar in higher energy range continues
   to be important as  well.     
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