2017ApJ...851..100C

We report the first high-significance GeV γ-ray detections of supernova remnants HESS J1731-347 and SN 1006, both of which have been previously detected by imaging atmospheric Cherenkov Telescopes above 1 TeV. Using 8 years of Fermi-LAT Pass 8 data at energies between 1 GeV and 2 TeV, we detect emission at the position of HESS J1731-347 with a significance of ∼5σ and a spectral index of Γ=1.66±0.16_stat±0.12_syst. The hardness of the index and the good connection with the TeV spectrum of HESS J1731-347 support an association between the two sources. We also confirm the detection of SN 1006 at ∼6σ with a spectral index of Γ=1.79±0.17_stat±0.27_syst. The northeast (NE) and southwest (SW) limbs of SN 1006 were also fit separately, resulting in the detection of the NE region (Γ=1.47±0.26_stat) and the non-detection of the SW region. The significance of different spectral components for the two limbs is 3.6σ , providing first indications of an asymmetry in the GeV γ-ray emission.