EGRET Gamma-Ray Observations of the Crab P2/P1 Ratio
W. F. Tompkins, B. B. Jones, P. L. Nolan, G. Kanbach, P. V. Ramanamurthy, D. J. Thompson
Abstract
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.
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