  Gravitational microlensing is a phenomenon that allows us to observe dark
remnants of stellar evolution even if they no longer emit electromagnetic
radiation. In particular, it can be useful to observe solitary neutron stars or
stellar-mass black holes, providing a unique window through which to understand
stellar evolution. Obtaining direct mass measurements with this technique
requires precise observations of both the change in brightness and the position
of the microlensed star and the European Space Agency's Gaia satellite can
provide both. We analysed events published in Gaia Data Release 3 (GDR3)
microlensing catalogue using publicly available data from different surveys.
Here we describe our selection of candidate dark lenses, where we suspect the
lens is a white dwarf (WD), a neutron star (NS), a black hole (BH), or a
mass-gap object, with a mass in a range between the heaviest NS and the least
massive BH. We estimated the mass of the lenses using information obtained from
the best-fitting microlensing models, the Galactic model and the expected
distribution of the parameters. We found eight candidates for WDs or NS, and
two mass-gap objects.
