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We have conducted multi-epoch synthesis imaging of 2 and 3 millimeter (mm)continuum emission and near infrared K band 2.2 um imaging of a flare event inJanuary 2003 that occurred on the young stellar object GMR-A which is suggestedto be a weak-line T Tauri star in the Orion cluster. Our mm data showed thatthe flare activity lasted at least over 13 days, whereas the K-band magnitudedid not change during this event. In addition, we have succeeded in detectingshort time variations of flux on the time scales of 15 minutes. The totalenergy of the flare is estimated to be 10^{35-36} erg, which makes it one ofthe most energetic flares reported to date. Comparing the mm continuumluminosities with reported X-ray luminosities, we conclude that the mm flarewas similar in nature to solar and other stellar flares. Our results will be acrucial step toward understanding magnetically induced stellar surfaceactivities in T Tauri stars.Comment: 5 pages, 5 figure

A Giant Flare on a T Tauri Star Observed at Millimeter Wavelengths