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GG Tau is a young stellar object consisting of a pair of close binaries (Leinert et al 1991), one of which is a ``classical'' T Tauri star (Herbig \& Bell 1988). Surrounding the main binary is a massive, rotating, circumbinary disk (Simon \& Guilloteau 1992; Kawabe et al 1993; Koerner et al 1993; Dutrey et al 1994) with possibly a central ``hole'' or cavity (Dutrey et al 1994). We have been monitoring the mm/sub-mm continuum flux from this disk at 800, 1100 and 1300 ${\mu}m$, and have found that between September 1991 and January 1994 the flux density has increased by $>$50\% at 800${\mu}m$, and much less at 1300${\mu}m$. The lack of significant flux changes at long wavelengths suggests that this outburst or ``flare'' results from a change in inner disk temperature with a steepening of the dust temperature gradient. One possible cause for a sudden temperature increase might be a massive accretion event in the inner circumstellar (as opposed to circumbinary) disk, like those believed to cause FU Orionis outbursts.
\begin{center} {References} \end{center}
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