  We have verified the absolute timing capabilities of the high-energy
instruments aboard INTEGRAL, i.e. the imager IBIS, the spectrometer SPI and the
X-ray monitor JEM-X. Calibration observations of the Crab, contemporaneous with
the Rossi X-ray Timing Explorer (RXTE), have been used to measure the absolute
phase of the main pulse of the Crab pulse profile using the same Jodrell Bank
radio ephemeris. The three INTEGRAL instruments and RXTE give within the
statistical and systematic uncertainties consistent results: The X-ray main
pulse is leading the radio pulse by 280 +/- 40 microsec. Also the shapes of the
X-ray pulse profiles as measured by the different instruments are fully
consistent with each other.
