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Understanding the complete nature of Galactic sources that accelerate cosmicrays up to $10^{15}$ eV energy (Galactic PeVatrons) is still an unsolvedproblem in high-energy astrophysics. Although supernova remnants have long beenconsidered as the best candidates for Galactic PeVatrons, a clear associationof SNRs with PeVatrons needs further exploration. Recently, the LHAASOcollaboration published its first catalog of 90 very high energy (VHE)gamma-ray sources, and a few of them have no obvious counterparts at otherwavelengths. Here, we will present morphology and spectral analysis of one suchunassociated source LHAASO J2108+5157 using VERITAS and HAWC data.

VERITAS and HAWC observations of unidentified source LHAASO J2108+5157