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   51144
   ASCA has made an important contribution to physics and astronomy with
   the discovery of the broad, redshifted, profile of the iron line in
   Seyfert 1 galaxies, indicative of emission from matter within a few
   Schwarzschild radii of a black hole (see Tanaka et al 1995). During the
   previous 4.5 day observation the line was briefly seen to show a
   greater redshift, suggesting that the accretion disk extends close
   enough to the event horizon that a Kerr metric is needed. This means
   that the black hole is probably spinning. No other observations are
   able to penetrate this close to a black hole; ASCA has opened up black
   hole physics to observational study. We propose here to re-observe MCG-
   6-30-15 for a full two weeks with ASCA to confirm and extend the
   evidence that the black hole is spinning.
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