  Recent observations of the Crab pulsar by the Energetic Gamma-Ray Experiment
Telescope (EGRET) on the Compton Gamma Ray Observatory show that the
high-energy gamma-ray light curve has changed little over the lifetime of the
instrument. Previous data collected by SAS-2 and COS-B in the years 1972-82,
along with earlier EGRET data, suggested a 14 year sinusoidal variation in the
flux ratio between the first and second peaks. The new data from EGRET indicate
that the flux ratio is constant.
