Imaging and spectral analysis results of ∼15 years of Fermi-LAT data at and around the remnant’s location. Left panel: 14° ×14° Fermi-LAT residual count map > 1 GeV in units of counts per pixel. The image, of 90″ pixels, is convolved with a σ = 10.1′ Gaussian. The thick white circle represents the 68% containment PSF size derived at the 1 GeV energy threshold used for the construction of the residual count map. Right panel: Fermi-LAT giga-electronvolt SED of S147. Black dots correspond to the Fermi-LAT spectrum in the 0.1–100 GeV band, obtained in this work. Red dots correspond to giga-electronvolt Fermi-LAT results reported in Suzuki et al. (2022).