OSSE Observations of the Crab Pulsar
NAVAL RESEARCH LAB WASHINGTON DC E O HULBURT CENTER FOR SPACE RESEARCH
Pagination or Media Count:
We present results of the Compton Gamma Ray Observatory OSSE observations of the Crab pulsar, made during MJD 48373-48406 27 April 1991-30 May 1991 and MJD 48798-48804 25 June 1992-1 July 1992. Pulsar light curves and spectra over the 0.05 to 10 MeV range are presented. The arrival time of the gamma-ray peak and the radio peak agree to within 30 microsecs, which is better than the 300 microsecs accuracy of the measurements. The overall pulse phase averaged spectrum in the 0.1-10 MeV range is well-fit by a power law of the form 005 x E0.13 MeVexp 1.99 plus or minus 0.03 photons sq cm sexp -1. The outer-gap model with gap parameter equal to 0.46 provided to us by Ho agrees with the data to better than 20. The spectra of the bridge and second peak are slightly harder that the first peak as measured by the hardness ratio 110-220 keV50-105 keV P1 0.54 plus or minus 0.01, P2 0.63 plus or minus 0.01, bridge 0.68 plus or minus 0.03. The phase of the two peaks in the light curve is constant over the 50-550 keV range to within the accuracy of the measurements better than 0.02 in in phase.