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In this Letter, we report detections of SiO v=3 J=1--0 maser emission in verylong baseline interferometric (VLBI) observations towards 4 out of 12long-period variable stars: WX Psc, R Leo, W Hya, and T Cep. The detectionstowards WX Psc and T Cep are new ones. We also present successful astrometricobservations of SiO v=2 and v=3 J=1--0 maser emissions associated with twostars: WX Psc and W Hya and their position-reference continuum sources:J010746.0+131205 and J135146.8-291218 with the VLBI Exploration of RadioAstrometry (VERA). The relative coordinates of the position-reference continuumsource and SiO v=3 maser spots were measured with respect to those of an SiOv=2 maser spot adopted as fringe-phase reference. Thus the faint continuumsources were inversely phase-referenced to the bright maser sources. It impliespossible registration of multiple SiO maser line maps onto a common coordinatesystem with 10 microarcsecond-level accuracy.

Pilot VLBI Survey of SiO v=3 J=1--0 Maser Emission around Evolved Stars