Microlensing could in principle separate a pulsar origin from a dark matter origin of the Galactic Centre gamma-ray excess, but detecting it requires a 10- to 10,000-fold sensitivity increase over Fermi-LAT.
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Gravitational Microlensing of the Galactic Centre $\gamma$-Ray Excess: A New Test for Point-Like or Extended Emission?
Microlensing could in principle separate a pulsar origin from a dark matter origin of the Galactic Centre gamma-ray excess, but detecting it requires a 10- to 10,000-fold sensitivity increase over Fermi-LAT.