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We discover a faint shell-type radio and X-ray source, G353.6-0.7, associatedwith HESS J1731-347. G353.6-0.7 is likely an old supernova remnant (SNR), basedon radio (0.8 GHz, 1.4 GHz and 5 GHz), infrared (8 $\mu$m from the GLIMPSELegacy Project and 21 $\mu$m from the Midcourse Space Experiment), and X-ray(0.1 keV - 2.4 keV from the ROSAT survey and 5 - 20 keV from the INTEGRALsurvey) data. The SNR, centered at ({\sl l}, {\sl b})=(353.55, -0.65) with aradius of $\sim$ 0.25$^{\circ}$, closely matches the outline of the recentlydiscovered extended TeV source HESS J1731-347, which has no previouslyidentified counterpart. A diffuse X-ray enhancement detected in the ROSATall-sky survey is coincident with lower half shell of the SNR. Therefore theSNR is the best radio counterpart of both the HESS source and the diffuse X-rayenhancement. G353.6-0.7 has an age of $\sim$ 27000 yrs. Altogether, the newdiscovery provides the best case that an old SNR emits TeV $\gamma$-rays.

Discovery of the radio and X-ray counterpart of TeV Gamma-ray source HESS J1731-347