Search for GeV gamma-ray emission from SPT-CL J2012-5649 with six years of DAMPE data

We search for gamma-ray emission from the galaxy cluster SPT-CL J2012-5649 in the energy range from 3 GeV to 1 TeV using the DArk Matter Particle Explorer (DAMPE) telescope. For our analysis, we use three different templates: point source, radial disk, and radial Gaussian. We do not detect a signal with significance $>3\sigma$ for any of these templates at any location within $R_{200}$ of the cluster center. We obtain 95% C.L. upper limit on the energy flux ranging between $\sim {10}^{-6}$ and ${10}^{-4}\mathrm{M}\mathrm{e}\mathrm{V}\mathrm{c}{\mathrm{m}}^{-2}{\mathrm{s}}^{-1}$ depending on the energy range. These upper limits are consistent with a previously reported non-zero flux detected by Fermi-LAT at $6\sigma$ significance. This work represents the first proof of principle search for gamma-ray emission from a single galaxy cluster using DAMPE data.