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We present multiwavelength analyses of an active optical transient AT2021fxuwhich shows the appearance of previously absent broad emission lines in arecent optical spectrum, suggesting a Changing-look (CL) Active GalacticNucleus (AGN). During the spectral transition, the brightness in the individualphotometric bands increased up to $\approx$0.6 in the optical bands and up to$\approx$1.1 magnitudes in the UV bands. The brightening was accompanied by ablueward shift of the optical spectrum. AT2021fxu shows high X-ray (0.3-10 keV)flux variability before and after the outburst, with the average X-ray fluxincreasing by a factor of $\approx$2 post-outburst. However, the X-ray spectralshape remains roughly the same, with no significant change in the line-of-sightcolumn density. AT2021fxu's overall properties are consistent with anaccretion-rate-driven transition from a Type-II to a Type-1 AGN.

A Multiwavelength study of the ongoing Changing-look AGN AT2021fxu