Improved constraints on H0 from a combined analysis of gravitational-wave and electromagnetic emission from GW170817

Understand

The luminosity distance measurement of GW170817 derived from GW analysis in Abbott et al.

• 2017 (here, A17:H0) is highly correlated with the measured inclination of the NS-NS system.
• To improve the precision of the distance measurement, we attempt to constrain the inclination by modeling the broad-band X-ray-to-radio emission from GW170817, which is dominated by the interaction of the jet with the environment.
• We update our previous analysis and we consider the radio and X-ray data obtained at $t<40$ days since merger.