Connecting the Ephemeris of the Geminga Pulsar to GLAST

The Geminga pulsar is unique among gammaray pulsars in having a precise andcontinuous, phaseconnected ephemeris from 1973 up to the present. Since thedemise of the Compton GammaRay Observatory in June 2000, the only practicalmethod of maintaining Geminga.s ephemeris has been with Xray observations. Thisis the final request for our XMMNewton program on Geminga, which will phaseconnect with GLAST and/or AGILE in 2007. The principal scientific need for aphaseconnected ephemeris is to provide an absolute phase reference forgroundbased observations, and to monitor glitch activity such as that whichrecurred in 2002. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]