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HESS J0632+057 is the only gamma-ray binary that has been detected at TeVenergies, but not at GeV energies yet. Based on nearly nine years of FermiLarge Area Telescope (LAT) Pass 8 data, we report here on a deep search for thegamma-ray emission from HESS J0632+057 in the 0.1-300 GeV energy range. We finda previously unknown gamma-ray source, Fermi J0632.6+0548, spatially coincidentwith HESS J0632+057. The measured flux of Fermi J0632.6+0548 is consistent withthe previous flux upper limit on HESS J0632+057 and shows variability that canbe related to the HESS J0632+057 orbital phase. We propose that FermiJ0632.6+0548 is the GeV counterpart of HESS J0632+057. Considering the VeryHigh Energy (VHE) spectrum of HESS J0632+057, a possible spectral turnoverabove 10 GeV may exist in Fermi J0632.6+0548, as appears to be common in otherestablished gamma-ray binaries.

GeV detection of HESS J0632+057