High energy bremsstrahlung emission during spontaneous fission of 252-Cf is observed. The new experimental method to detect rare coincident events by digital storage oscilloscope is used. The γ-rays with energies up to 60 MeV have been measured (by a BGO detector) in coincidence with neutrons detected by a plastic scintillator. The determination of γ-ray emission probability up to the value of about 8 × 10−9 event/(MeV × fission) at Eγ = 60 MeV is achieved.