The swan song: the disappearance of the nucleus of NGC 4051 and the echo   of its past glory
  BeppoSAX observed the low-luminous Seyfert 1 Galaxy NGC4051 in a ultra-dim X-ray state. The 2-10 keV flux (1.26 x 10^{-12} erg/cm^2/s) was about 20 times fainter than its historical average value, and remained steady along the whole observation (~2.3 days). The observed flat spectrum (\Gamma ~ 0.8) and intense iron line (EW ~600 eV) are best explained assuming that the active nucleus has switched off, leaving only a residual reflection component visible. 
M.Guainazzi (1), F.Nicastro (2,3), F.Fiore (3,4), G.Matt (5),   I.McHardy (6), A.Orr (1), P.Barr (1), A.Fruscione (7), I.Pap...