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We report on the first detection of maser emission in the J=11-10, J=14-13and J=15-14 transitions of the v=0 vibrational state of SiS toward the C-richstar IRC+10216. These masers seem to be produced in the very inhomogeneousregion between the star and the inner dust formation zone, placed at 5-7 R*,with expansion velocities below 10 km/s. We interpret the pumping mechanism asdue to overlaps between v=1-0 ro-vibrational lines of SiS and mid-IR lines ofC2H2, HCN and their 13C isotopologues. The large number of overlaps foundsuggests the existence of strong masers for high-J v=0 and v=1 SiS transitions,located in the submillimeter range. In addition, it could be possible to findseveral rotational lines of the SiS isotopologues displaying maser emission.

High-J v=0 SiS Maser Emission in IRC+10216: A New Case of Infrared Overlaps