Long-term X-ray, UV, and optical light curve of XMMSL2 J1446+68 plotted against time. From top to bottom: 0.2–2 keV, UVW2 (1928 Å), UVM2 (2246 Å), UVW1 (2600 Å), U (3465 Å), B (4500 Å), V (5430 Å), and R (6580 Å). X-ray points are shown as red stars, Swift-UVOT filters as circles, XMM-Newton-OM filter points as diamonds, and the Cebreros telescope points as squares. A GALEX-NUV measurement, taken in 2007 and calibrated to the UVM2 filter values, is shown as a green triangle and the RASS soft X-ray upper limit from 1990–1991 as a downward red triangle. All points show the observed fluxes and magnitudes without host galaxy subtraction.