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SAGE (SagnAc interferometer for Gravitational wavE) is a project for a spaceobservatory based on multiple 12-U CubeSats in geosynchronous orbit. Theobjective is a fast track mission which would fill the observational gapbetween LISA and ground based observatories. With albeit a lower sensitivity,it would allow early investigation of the nature and event rate ofintermediate-mass black hole (IMBH) mergers, constraining our understanding ofthe universe formation by probing the building up of IMBH up to supermassiveblack holes. Technically, the CubeSats would create a triangular Sagnacinterferometer with 140.000km roundtrip arm length, optimized to be sensitiveto gravitational waves at frequencies between 10mHz and 2Hz. The nature of theSagnac measurement makes it almost insensitive to position error, enabling theuse of spacecrafts in ballistic trajectories. The light source andrecombination units of the interferometer are based on compact fiberedtechnologies without bulk optics. A peak sensitivity of 23 pm/sqrt(Hz) isexpected at 1Hz assuming a 200mW internal laser source and 10-centimeterdiameter apertures. Because of the absence of a test mass, the main limitationwould come from the non-gravitational forces applied on the spacecrafts.However, conditionally upon our ability to partially post-process the effect ofsolar wind and solar pressure, SAGE would allow detection of gravitationalwaves with strains as low as a few 1e-19 within the 0.1 to 1Hz range. Averagedover the entire sky, and including the antenna gain of the Sagnacinterferometer, the SAGE observatory would sense equal mass black hole mergersin the 1e4 to 1e6 solar masses range up to a luminosity distance of 800Mpc.Additionally, coalescence of stellar black holes (10Msun) around SMBH (IMBH)forming extreme (intermediate) mass ratio inspirals could be detected within asphere of radius 200Mpc.

SAGE: finding IMBH in the black hole desert