The dependence of observed gamma-ray pulsar spectra on viewing geometry
  We calculate the gamma-ray lightcurves and spectra of rotation powered pulsars for a wide range of observer's viewing angles, and inclination angles of the magnetic axis to the rotation axis. We show how the shapes of the observed phase-averaged spectra as well as energy-integrated pulse profiles depend on the orientation for classical and millisecond pulsars. 
Agnieszka Wozna (1), Jaroslaw Dyks (1), Tomasz Bulik (2), Bronislaw   Rudak (1 and 3) ((1) Copernicus Astronomical Center, T...