  The first direct detection of gravitational waves from binary neutron stars
on the 17th of August, 2017, (GW170817) heralded the arrival of a new messenger
for probing neutron star astrophysics and provided the first constraints on
neutron star equation of state from gravitational wave observations.
Significant computational effort was expended to obtain these first results and
therefore, as observations of binary neutron star coalescence become more
routine in the coming observing runs, there is a need to improve the analysis
speed and flexibility. Here, we present a rapid approach for inferring the
neutron star equation of state based on Normalising Flows. As a demonstration,
using the same input data, our approach, ASTREOS, produces results consistent
with those presented by the LIGO-Virgo collaboration but requires < 1 sec to
generate neutron star equation of state confidence intervals. Furthermore,
ASTREOS allows for non-parametric equation of state inference. This rapid
analysis will not only facilitate neutron star equation of state studies but
can potentially enhance future alerts for electromagnetic follow-up
observations of binary neutron star mergers.
