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The DArk Matter Particle Explorer (DAMPE) can measure $\gamma$-rays in theenergy range from a few GeV to about 10 TeV. The direction of each $\gamma$-rayis reconstructed with respect to the reference system of the DAMPE payload. Inthis paper, we adopt a maximum likelihood method and use the $\gamma$-ray datacentered around several bright point-like sources to measure and correct theangular deviation from the real celestial coordinate system, the so called``boresight alignment'' of the DAMPE payload. As a check, we also estimate theboresight alignment for some sets of simulation data with artificialorientation and obtain consistent results. The time-dependent boresightalignment analysis does not show evidence for significant variation of theparameters.

Boresight Alignment of DArk Matter Particle Explorer