  With almost 15 years of data taken by the Large Area Telescope (LAT) onboard
the Fermi satellite we discovered an extended source of GeV emission in the
region of the very-high-energy (TeV) source 1LHAASO J1945+2424. This TeV source
is more extended than the LAT source. The spectrum of the GeV emission is hard
(with a photon spectral index ~1.5) and connects smoothly with that of the TeV
source, indicating a likely common origin. In order to explain the origin of
the gamma rays we explore scenarios which are typically used for supernova
remnants (SNRs) and pulsar wind nebulae (PWN). For an SNR with a single
particle population, a leptonic particle distribution in the form of a broken
power-law with a break energy of ~3.7 TeV explains the spectrum well, while in
the hadronic scenario a simple power-law with a hard spectral index of ~1.64 is
necessary. In the PWN scenario, reasonable parameters are obtained for a source
age of 10 kyr and current pulsar spin-down luminosity of 1e34 erg/s.
