X-ray emission from the HBL object 1E1207.9+3945

A.Maselli, P.Giommi, A.Tramacere, F.Massaro, M.Perri, M.Capalbi et al.

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We present a new analysis of the complete X-ray observation, covering a 25 year long time interval, of the HBL object 1E1207.9+3945, which is about 5 arcminutes North of the Sy1 galaxy NGC 4151. The historic light curve shows flux variation larger than a factor of ~3,associated with spectral changes.