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We report the discovery of a mid-infrared (MIR) flare using WISE data in thecenter of the nearby Seyfert 1.9 galaxy MCG-02-04-026. The MIR flare began inthe first half of 2014, peaked around the end of 2015, and faded in 2017.During these years, energy more than $7\times10^{50}$ erg was released in theinfrared, and the flare's MIR color was generally turning red. We detectedneither optical nor ultraviolet (UV) variation corresponding to the MIR flarebased on available data. We explained the MIR flare using a dust echo model inwhich the radiative transfer is involved. The MIR flare can be well explainedas thermal reradiation from dust heated by UV-optical photons of a primarynuclear transient event. Although the transient event was not seen directly dueto dust obscuration, we can infer that it may produce a total energy of atleast $\sim10^{51}$ erg, most of which was released in less than $\sim$3 years.The nature of the transient event could be a stellar tidal disruption event bythe central supermassive black hole (SMBH), or a sudden enhancement of theexisting accretion flow onto the SMBH, or a supernova which was particularlybright.

A Mid-infrared Flare in the Active Galaxy MCG-02-04-026: Dust Echo of a Nuclear Transient Event