The high‐energy gamma‐ray light curve of PSR B1259 ‐63

The high‐energy gamma‐ray light curve of the binary system PSR B1259 ‐63, is computed using the approach that successfully predicted the spectrum at periastron. The simultaneous INTEGRAL and H.E.S.S. spectra taken 16 days after periastron currently permit both a model with dominant radiative losses, high pulsar wind Lorentz factor and modest efficiency as well as one with dominant adiabatic losses, a slower wind and higher efficiency. In this paper we shown how the long‐term light curve may help to lift this degeneracy.