γ-ray imaging and spectral analysis results of G279.0+01.1. Left panel: 4° × 4° Fermi-LAT TS map >5 GeV centered at the coordinates used in Araya (2020). The image, of 90" pixel size, is convolved with a σ = 6.75′ Gaussian. The magenta thick circle represents the 68% containment PSF size, applied at the 5 GeV energy threshold used for the construction of the TS map. Right panel: 4FGL J1000.0-53l2e Fermi-LAT SED. Black dots correspond to the Fermi-LAT spectrum in the 0.5–500 GeV band, obtained in this work. Red and blue dots correspond to giga-electronvolt Fermi-LAT data reported in Araya (2020) and TeV-H.E.S.S. upper limits reported in H.E.S.S. Collaboration (2018b), respectively.