Boresight Alignment of DArk Matter Particle Explorer

Abstract

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

References in corpus (11)

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• The DArk Matter Particle Explorer mission
• The On-orbit Calibrations for the Fermi Large Area Telescope
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Cited by in corpus (4)

• Search for gamma-ray spectral lines with the DArk Matter Particle Explorer
• PSF Calibration of DAMPE for gamma-ray Observations
• Observations of the Fermi bubbles and the Galactic center excess with the DArk Matter Particle Explorer
• The calibrations of DAMPE $\gamma$-ray effective area