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The gamma-ray binary system PSR B1259-63, consists of a Be star and a pulsar, and is one of only a few know systems where their spectral energy distribution peaks in the gamma-ray regime. It is also the only gamma-ray binary where the nature of the compact object is known. Near periastron, the pulsar pass through the circumstellar disc that surrounds the Be star companion. Observations around periastron show a local minimum in the TeV gamma-ray flux at periastron, when the seed photon energy density, and hence the inverse Compton flux, should be highest. This may be explained through gamma-gamma absorption. Here we show that the contribution of the photons from the circumstellar disc surrounding the Be star significantly modifies the gamma-gamma absorption and may be sufficient to explain the very high energy light curve.
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