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Supernova remnants (SNRs) are the most attractive candidates for theacceleration sites of Galactic cosmic rays. We report the detection of GeV$\gamma$-ray emission with the Pass 8 events recorded by Fermi Large AreaTelescope (Fermi-LAT) in the vicinity of the shell type SNR CTB 37B that islikely associated with the TeV $\gamma-$ray source HESS J1713-381. The photonspectrum of CTB 37B is consistent with a power-law with an index of$1.89\pm0.08$ in the energy range of $0.5-500$ GeV, and the measured fluxconnects smoothly with that of HESS J1713-381 at a few hundred GeV. Nosignificant spatial extension and time variation are detected. Themulti-wavelength data can be well fitted with either a leptonic model or ahadronic one. However, parameters of both models suggest more efficientparticle acceleration than typical SNRs. Meanwhile, the X-ray and $\gamma$-rayspectral properties of CTB 37B show that it is an interesting source bridgingyoung SNRs dominated by non-thermal emission and old SNRs interacting withmolecular clouds.

A GeV source in the direction of Supernova Remnant CTB 37B