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This paper focuses on NGC 1533 and the pair IC 2038 and IC 2039 in Dorado anearby, clumpy, still un-virialized group. We obtained their surface photometryfrom deep OmegaCAM@ESO-VST images in g and r bands. For NGC 1533, we map thesurface brightness down to $\mu_g \simeq 30.11$ mag/arcsec$^{2}$ and $\mu_r\simeq 28.87$ mag/arcsec$^{2}$ and out to about $4R_e$. At such faint levelsthe structure of NGC 1533 appear amazingly disturbed with clear structuralasymmetry between inner and outer isophotes in the North-East direction. Wedetect new spiral arm-like tails in the outskirts, which might likely be thesignature of a past interaction/merging event. Similarly, IC 2038 and IC 2039show tails and distortions indicative of their ongoing interaction. Takingadvantages of deep images, we are able to detect the optical counterpart to theHI gas. The analysis of the new deep data suggests that NGC 1533 had a complexhistory made of several interactions with low-mass satellites that generatedthe star-forming spiral-like structure in the inner regions and are shaping thestellar envelope. In addition, the VST observations show that also the two lessluminous galaxies, IC 2038 and IC 2039, are probably interacting each-otherand, in the past, IC 2038 could have also interacted with NGC 1533, whichstripped away gas and stars from its outskirts. The new picture emerging fromthis study is of an interacting triplet, where the brightest galaxy NGC 1533has ongoing mass assembly in the outskirts.

VEGAS: a VST Early-type GAlaxy Survey. IV. NGC 1533, IC 2038 and IC 2039: an interacting triplet in the Dorado group