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In recent years some efforts have been made to identify active sourcescapable of accelerating particles up to $10^{15}$ eV, known as PeVatrons.Measurements of TeV ($10^{12}$ eV) gamma-rays from supernova remnants (SNRs)have shown that efficient particle acceleration can occur in SNR diffusiveshocks. In this paper, we obtain the contribution to the high energy andvery-high-energy gamma-ray (VHE, $E > 100$ GeV) emission due to cosmic-rayacceleration from SNR G57.2+0.8 hosting the Soft Gamma Repeater (SGR)J1935+2154 with the use of the GALPROP code. To do so, we take into account theSNR + SGR association as a single source close to the Galactic center. Wepropose that the above setting can provide a more comprehensive scenario forthe generation of GeV-TeV gamma-rays. We also discuss the contribution from theSNR G57.2+0.8 and SGR J1935+2154 region to the diffusive TeV energy gamma-rayemission from the Galactic center.

High-energy gamma-ray emission from SNR G57.2+0.8 hosting SGR J1935+2154