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The description of Wigner-friend scenarios -- in which external agentsdescribe a closed laboratory containing a friend making a measurement --remains problematic due to the ambiguous nature of quantum measurements. Oneoption is to endorse assumptions leading to observer-dependent facts, giventhat the friend's measurement outcome is not defined from the point of view ofthe external observers. We introduce in this work a model in a relativisticcontext showing that these assumptions can also lead to measurement recordsthat depend on the inertial reference frame in which the agents make theirobservations. Our model is based on an entangled pair shared by the friend anda distant agent performing space-like separated measurements. An externalobserver at rest relative to the closed laboratory and observers in a movingframe do not agree on the observed records, which are not Lorentz transforms ofone another.

From observer-dependent facts to frame-dependent measurement records in Wigner friend scenarios