Energy dependence of Crab pixel position due to offset in field of view

Shown below are a field image with Crab in extreme offset (observation period 899, Wide Field Camera 1), and plots of the x- and y-pixel position of the Crab as a function of the energy channel. It is seen that at the highest energies (channels 26-31) the penetration effect of the hard photons affects the position. These channels are not used for the Crab spectral calibration.

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Latest update: 02 April 1999