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This paper presents a spatially-resolved kinematic study of the jellyfishgalaxy JO201, one of the most spectacular cases of ram-pressure stripping (RPS)in the GASP (GAs Stripping Phenomena in Galaxies with MUSE) survey. By studyingthe environment of JO201, we find that it is moving through the denseintra-cluster medium of Abell 85 at supersonic speeds along our line of sight,and that it is likely accompanied by a small group of galaxies. Given thedensity of the intra-cluster medium and the galaxy's mass, projected positionand velocity within the cluster, we estimate that JO201 must so far have lost~50% of its gas during infall via RPS. The MUSE data indeed reveal a smoothstellar disk, accompanied by large projected tails of ionised (Halpha) gas,composed of kinematically cold (velocity dispersion <40km/s) star-forming knotsand very warm (>100km/s) diffuse emission which extend out to at least ~50 kpcfrom the galaxy centre. The ionised Halpha-emitting gas in the disk rotateswith the stars out to ~6 kpc but in the disk outskirts becomes increasinglyredshifted with respect to the (undisturbed) stellar disk. The observeddisturbances are consistent with the presence of gas trailing behind thestellar component, resulting from intense face-on RPS happening along the lineof sight. Our kinematic analysis is consistent with the estimated fraction oflost gas, and reveals that stripping of the disk happens outside-in, causingshock heating and gas compression in the stripped tails.

GASP II. A MUSE view of extreme ram-pressure stripping along the line of sight: kinematics of the jellyfish galaxy JO201