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We investigate the capability of LISA to measure the sky position ofequal-mass, nonspinning black hole binaries, combining for the first time theentire inspiral-merger-ringdown signal, the effect of the LISA orbits, and thecomplete three-channel LISA response. We consider an ensemble of systems nearthe peak of LISA's sensitivity band, with total rest mass of 2\times10^6M\odot, a redshift of z = 1, and randomly chosen orientations and skypositions. We find median sky localization errors of approximately \sim3arcminutes. This is comparable to the field of view of powerful electromagnetictelescopes, such as the James Webb Space Telescope, that could be used tosearch for electromagnetic signals associated with merging massive black holes.We investigate the way in which parameter errors decrease with measurementtime, focusing specifically on the additional information provided during themerger-ringdown segment of the signal. We find that this information improvesall parameter estimates directly, rather than through diminishing correlationswith any subset of well- determined parameters. Although we have employed thebaseline LISA design for this study, many of our conclusions regarding theinformation provided by mergers will be applicable to alternative missiondesigns as well.

Sky localization of complete inspiral-merger-ringdown signals for nonspinning massive black hole binaries