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Multi-epoch photometry from AllWISE provides the opportunity to investigatevariability at 3.4 and 4.6 microns for most known brown dwarfs. WISE observedthe same patch of sky repeatedly and within a day's time, roughly 12observations were obtained on a given patch of sky; then, another 12 wereobtained roughly six months later when that patch of sky was again in view. Formost of the sky, AllWISE contains two separate epochs of about a dozenobservations each, although ~30% of the sky has three such epochs available inAllWISE. With the AllWISE multi-epoch photometry of ~1500 known M, L, T, and Ydwarfs, I computed the Stetson J Index and quantified variability as a functionof spectral type. I found that the average single-exposure photometricuncertainty in AllWISE (~0.2 magnitudes) is too large to robustly identify fluxvariability smaller than ~20%. However, multi-epoch photometry from AllWISEremains a useful resource in cases where flux variability is known to bepresent with large amplitudes, or for bright nearby objects with lowerphotometric uncertainties.

Investigating Brown Dwarf Variability at 3.4 & 4.6 Microns with AllWISE Multi-Epoch Photometry