Fig. B.1

image

Long-term NEOWISE-R, ASAS-SN, and ZTF light curves of AT 2019avd. The early and late black dashed lines mark the 2015 XMM-Newton pointed and the 2020 eROSITA eRASS1 observations respectively. The early and late grey dashed linesmark the MJD that the NOT and first FLOYDS spectra were taken.

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