  We find an instanton (caloron) solution in the finite-temperature SU(2) gluon
gas subjected to (imaginary, in Euclidean spacetime) rotation. We demonstrate
that the rotation decreases the temperature of the caloron and leads to the
delocalization of its topological charge over fractionally charged
constituents. Furthermore, we show that in the high-temperature limit, the
rapidly-rotating caloron becomes a ``circulon'': a self-dual monopole (dyon)
possessing a spatial toroidal core.
