COMPTEL observations of the Crab during the CGRO sky survey
During the all-sky survey of the Compton Gamma Ray Observatory (CGRO) the Crab pulsar and nebula were observed several times. The unprecedented exposure allows detailed spectral shape determination together with a phase-resolved study of the Crab pulsar in the 0.75-30MeV energy range. We show that, except for the second peak, the phase-resolved COMPTEL data cannot be described by a simple extrapolation of the higher energy (50MeV-10GeV) EGRET best-fit power-law. Evidence was found for time variability of the unpulsed emission on a time scale of 16 months.
Astronomy and Astrophysics
European Southern Observatory (ESO)
R. Much, K. Bennett, R. Buccheri, M. Busetta, R. Diehl, D. Forrest, W. Hermsen, L. Kuiper, G.G. Lichti, M. McConnell, J. Ryan, V. Schönfelder, H. Steinle, A. Strong, and M. Varendorff. COMPTEL OBSERVATIONS OF THE CRAB DURING THE CGRO SKY SURVEY. 1995, Astron. Astrophys., 299, 435.