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We report $I$-band photometric observations of the radio-detected M9.5 dwarfBRI 0021-0214, obtained with the Galway Ultra Fast Imager (GUFI) on the 1.8mVatican Advanced Technology Telescope VATT at Mt. Graham InternationalObservatory, Arizona. In total, 19 hours of observations over a 73 day baselinewere obtained. BRI 0021-0214 was shown to exhibit modulated emission with aperiod of $ 3.052 \pm 0.004$ hours with a mean amplitude variability of 0.0044mag. When combined with rotational velocity data obtained from previous work,our newly discovered rotation period gives an inclination angle of51.7$^{+5.0}_{-4.5}$ degrees for the rotation axis of BRI 0021-0214 relative toour line of sight. Previous studies have reported that the most plausible causefor optical variability from this dwarf is a consequence of suspendedco-rotating dust clouds in its atmosphere. However reports of enhancedH$_{\alpha}$ and intermittent coherent radio emission suggest the possibilityof auroral activity in its magnetosphere. Further, more coordinatedmultiwavlength observations of this dwarf could fully resolve the nature ofthis elusive rapid-rotator object's observational properties.

Optical Variability, Rotation Period and Inclination Angle of the M9.5 dwarf BRI 0021-0214