Based on the detailed sampling of the VHE and Xray light curves reported here , coupled with the measurement of an unexpected low - energy spectral cutoff in the VHE low state , it is clear that the existing models will require significant revision . Analysis of the pulsar timing evolution over periastron will provide important additional input , including more accurate measurements of the system geometry . It will also allow for more sensitive searches for GeV emission in the Fermi -LAT data , with the dominant magnetospheric emission from the pulsar removed by a temporally - gated analysis .