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The identification of the electromagnetic counterpart candidate ZTF19abanrhrto the binary black hole merger GW190521 opens the possibility to infercosmological parameters from this standard siren with a uniquely identifiedhost galaxy. The distant merger allows for cosmological inference beyond theHubble constant. Here we show that the three-dimensional spatial location ofZTF19abanrhr calculated from the electromagnetic data remains consistent withthe updated sky localization of GW190521 provided by the LIGO-VirgoCollaboration. If ZTF19abanrhr is associated with the GW190521 merger andassuming a flat wCDM model we find that $H_0 =48^{+24}_{-10}$ km/s/Mpc,$\Omega_m =0.39^{+0.38}_{-0.29}$, and $w_0 = -1.29^{+0.63}_{-0.50}$ (median and68% credible interval). If we use the Hubble constant value inferred fromanother gravitational-wave event, GW170817, as a prior for our analysis,together with assumption of a flat ${\Lambda}$CDM and the model-independentconstraint on the physical matter density ${\omega}_m$ from Planck, we find$H_0 = 69.1^{8.7}_{-6.0}$ km/s/Mpc.

A Standard Siren Cosmological Measurement from the Potential GW190521 Electromagnetic Counterpart ZTF19abanrhr