See E.H., p.

9, and the Sacred Books of the East, vol.xi.
(3) On his attaining to nirvana, Sakyamuni became the Buddha, and had no longer to mourn his being within the circle of transmigration, and could rejoice in an absolute freedom from passion, and a perfect purity.

Still he continued to live on for forty-five years, till he attained to pari-nirvana, and had done with all the life of sense and society, and had no more exercise of thought.

He died; but whether he absolutely and entirely _ceased_ to be, in any sense of the word _being_, it would be difficult to say.

Probably he himself would not and could not have spoken definitely on the point.