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The IceCube instrument detected a high-energy cosmic neutrino event on 2017September 22 (IceCube_170922A, IceCube Collaboration 2018), which theelectromagnetic follow-up campaigns associated with the flaring $\gamma$-rayblazar TXS 0506$+$056 (e.g., Padovani et al., 2018). We investigated themid-infrared variability of the source by using the available single exposuredata of the WISE satellite at $3.4$ and $4.6\mu$m. TXS 0506$+$056 experienced a$\sim 30$% brightening in both of these bands a few days prior to the neutrinoevent. Additional intraday infrared variability can be detected in 2010.Similar behaviour seen previously in $\gamma$-ray bright radio-loud AGN hasbeen explained by their jet emission (e.g., Jiang et al. 2012).

Mid-infrared variability of the neutrino source blazar TXS 0506$+$056