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We present deep new GTC/OSIRIS narrow-band images and optical WHT/ISISlong-slit spectroscopy of the merging system Mrk273 that show a spectacularextended halo of warm ionised gas out to a radius of $\sim45$ kpc from thesystem nucleus. Outside of the immediate nuclear regions (r > 6 kpc), there isno evidence for kinematic disturbance in the ionised gas: in the extendedregions covered by our spectroscopic slits the emission lines are relativelynarrow (FWHM $\lesssim$ 350 km$\rm s^{-1}$) and velocity shifts small(|$\Delta$V| $\lesssim{} $250 km$\rm s^{-1}$). This is despite the presence ofpowerful near-nuclear outflows (FWHM > 1000 km$\rm s^{-1}$; |$\Delta$V| > 400km$\rm s^{-1}$; r < 6 kpc). Diagnostic ratio plots are fully consistent withSeyfert 2 photo-ionisation to the NE of the nuclear region, however to the SWthe plots are more consistent with low-velocity radiative shock models. Thekinematics of the ionised gas, combined with the fact that the main structuresare aligned with low-surface-brightness tidal continuum features, areconsistent with the idea that the ionised halo represents tidal debris leftover from a possible triple-merger event, rather than a reservoir of outflowinggas.

No evidence for large-scale outflows in the extended ionised halo of ULIRG Mrk273