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We predicted a stellar occultation of the bright star Gaia DR14332852996360346368 (UCAC4 385-75921) (m$_{\rm V}$= 14.0 mag) by the centaur2002 GZ$_{32}$ for 2017 May 20$^{\rm th}$. Our latest shadow path predictionwas favourable to a large region in Europe. Observations were arranged in abroad region inside the nominal shadow path. Series of images were obtainedwith 29 telescopes throughout Europe and from six of them (five in Spain andone in Greece) we detected the occultation. This is the fourth centaur, besidesChariklo, Chiron and Bienor, for which a multi-chord stellar occultation isreported. By means of an elliptical fit to the occultation chords we obtainedthe limb of 2002 GZ$_{32}$ during the occultation, resulting in an ellipse withaxes of 305 $\pm$ 17 km $\times$ 146 $\pm$ 8 km. From this limb, thanks to arotational light curve obtained shortly after the occultation, we derived thegeometric albedo of 2002 GZ$_{32}$ ($p_{\rm V}$ = 0.043 $\pm$ 0.007) and a 3-Dellipsoidal shape with axes 366 km $\times$ 306 km $\times$ 120 km. This shapeis not fully consistent with a homogeneous body in hydrostatic equilibrium forthe known rotation period of 2002 GZ$_{32}$. The size (albedo) obtained fromthe occultation is respectively smaller (greater) than that derived from theradiometric technique but compatible within error bars. No rings or debrisaround 2002 GZ$_{32}$ were detected from the occultation, but narrow and thinrings cannot be discarded.

The 2017 May 20$^{\rm th}$ stellar occultation by the elongated centaur (95626) 2002 GZ$_{32}$