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We combine the gravitational-wave measurement of the effective distance tothe binary neutron star merger GW170817, the redshift of its host galaxy NGC4993, and the latest Hubble constant measurement from the Dark Energy Survey toconstrain the inclination between the orbital angular momentum of the binaryand the line of sight to $18 \pm 8$ degrees (less than 28 degrees at 90%confidence). This provides a complementary constraint on models of potentialafterglow observations.

The orbit of GW170817 was inclined by less than 28 degrees to the line of sight