One more surprise from the Circinus Galaxy: BeppoSAX discovery of a   transmission component in hard X-rays
  The Circinus Galaxy has been observed, for the first time above 10 keV, by BeppoSAX. An excess emission above the extrapolation of the best fit 0.1--10 keV spectrum is apparent in the PDS data. The most likely explanation is that we are observing the nucleus through a column density of about 4x10**24 cm-2, i.e. large enough to completely block the radiation below 10 keV but small enough to permit partial transmission above this energy. 
G. Matt, M. Guainazzi, R. Maiolino, S. Molendi, G.C. Perola, L.A.   Antonelli, L. Bassani, W.N. Brandt, A.C. Fabian, F. Fior...