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We present new results from a continuing 5 GHz search for flaring radioemission from a sample of L and T brown dwarfs, conducted with the 305-mArecibo radio telescope. In addition to the previously reported flaring fromthe T6.5-dwarf 2MASS J10475385+212423, we have detected and confirmedcircularly polarized flares from another T6-dwarf, WISEPC J112254.73+255021.5.Although the flares are sporadic, they appear to occur at a stable period of0.288 hours. Given the current constraints, periods equal to its second andthird subharmonic cannot be ruled out. The stability of this period over the8-month timespan of observations indicates that, if real, it likely reflectsthe star's rapid rotation. If confirmed, any of the three inferredperiodicities would be much shorter than the shortest, 1.41-hour rotationperiod of a brown dwarf measured so far. This finding would place a newobservational constraint on the angular momentum evolution and rotationalstability of substellar objects. The detection of radio emission from the sixth~1000 K dwarf further demonstrates that the coolest brown dwarfs and, possibly,young giant planets, can be efficiently investigated using radio observationsat centimeter wavelengths as a tool.

Radio Flaring from the T6 Dwarf WISEPC J112254.73+255021.5 with A Possible Ultra-short Periodicity