We report differential I-band photometry of four early L-dwarfs obtained to study variability. We detect variability on the timescale of hours in two objects, 2M0746425+200032 (at a level of 0.007 mag -- 6.5 sigma) and 2M1108307+683017 (0.012 mag -- 5 sigma). We also place upper limits of 0.02 mag (1 sigma) on the variability of two others.
@article{arxiv.astro-ph/0205463,
title = {A mini-survey for variability in early L dwarfs},
author = {F. J. Clarke and B. R. Oppenheimer and C. G. Tinney},
journal= {arXiv preprint arXiv:astro-ph/0205463},
year = {2009}
}