Detection significance (TS) map from Fermi/LAT data in the 1–500 GeV band. The cyan contour levels indicate regions with TS values of 9, 16, and 20 (corresponding to 3σ, 4σ, and 4.5σ, respectively). The white dashed annulus marks the inner and outer boundaries of the radio emission detected by Arias et al. (2022), the black box indicates the field of view of our XMM-Newton observations while the green boxes mark the field of view of the TNG/DOLORES pointings P1, P2, and P4. The position of the Calvera pulsar is marked with the black cross while the region of diffuse X-ray emission is indicated by the black line.