  Very recently a compact object with a mass in the range $2.50\div 2.67\,
M_{\odot}$ has been discovered via gravitational waves detection of a compact
binary coalescence. The mass of this object makes it among the heaviest neutron
star never detected or the lightest black hole ever observed. Here we show that
a neutron star with this observed mass, can be consistently explained with the
mass-radius relation obtained by Extended Theories of Gravity. Furthermore,
equations of state, consistent with LIGO observational constraints, are
adopted. We consider also the influence of rotation and show that masses of
rotating neutron stars can exceed $2.6 M_\odot$ for some equations of state
compatible with LIGO data.
