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To test alternative hypotheses for the behavior of KIC 8462852, we obtainedmeasurements of the star over a wide wavelength range from the UV to themid-infrared from October 2015 through December 2016, using Swift, Spitzer andat AstroLAB IRIS. The star faded in a manner similar to the long-term fadingseen in Kepler data about 1400 days previously. The dimming rate for the entireperiod reported is 22.1 +\- 9.7 milli-mag/yr in the Swift wavebands, withamounts of 21.0 +\- 4.5 mmag in the groundbased B measurements, 14.0 +\- 4.5mmag in V, and 13.0 +\- 4.5 in R, and a rate of 5.0 +\- 1.2 mmag/yr averagedover the two warm Spitzer bands. Although the dimming is small, it is seen at>= 3 sigma by three different observatories operating from the UV to the IR.The presence of long-term secular dimming means that previous SED models of thestar based on photometric measurements taken years apart may not be accurate.We find that stellar models with T_{eff} = 7000 - 7100 K and A_V ~ 0.73 bestfit the Swift data from UV to optical. These models also show no excess in thenear-simultaneous Spitzer photometry at 3.6 and 4.5 microns, although a longerwavelength excess from a substantial debris disk is still possible (e.g., asaround Fomalhaut). The wavelength dependence of the fading favors a relativelyneutral color (i.e., R_V >= 5, but not flat across all the bands) compared withthe extinction law for the general ISM (R_V = 3.1), suggesting that the dimmingarises from circumstellar material.

Extinction and the Dimming of KIC 8462852