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A novel $\gamma$-ray supernova remnant (SNR) G206.9+2.3 is first reported inthis study. We arrived at this conclusion after analyzing 12.4 years ofobservation data of the Fermi Large Area Telescope (Fermi-LAT). The photon fluxof the remnant was (1.19$\pm$0.59) 10$^{-9}$ cm$^{-2}$ s$^{-1}$, and itspower-law spectral index was 2.22$\pm$0.19 in the 0.2-500 GeV energy band.Moreover, we found that the test statistic values of the global fit from thefour different energy bands were greater than 9. We identified that this was areal $\gamma$-ray signal. Furthermore, we found that its GeV spatial locationwas in good agreement with that of its radio band. Its spectral energydistribution and light curve properties were similar to those of SNRs. Wesuggest that the novel $\gamma$-ray source is a likely counterpart to SNRG206.9+2.3. Consequently, we discuss its likely leptonic or hadronic origin.

Likely GeV emission from an old Supernova Remnant: SNR G206.9+2.3