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We present results obtained from spectroscopic observations of red giantslocated in the fields of the Large Magellanic Cloud (LMC) globular clusters(GCs) NGC 1928 and NGC 1939. We used the GMOS and AAOmega+2dF spectrographs toobtain spectra centred on the CaII triplet, from which we derived individualradial velocities (RVs) and metallicities. From cluster members we derived meanRVs of RV_NGC1928=249.58+-4.65 km/s and RV_NGC939=258.85+-2.08 km/s, and meanmetallicities of [Fe/H]_NGC1928=-1.30+-0.15 dex and [Fe/H]_NGC1939=-2.00+-0.15dex. We found that both GCs have RVs and positions consistent with being partof the LMC disc, so that we rule out any possible origin but that in the samegalaxy. By computing the best solution of a disc that fully contains each GC,we obtained circular velocities for the 15 known LMC GCs. We found that 11/15of the GCs share the LMC rotation derived from $HST$ and $Gaia$ DR2 propermotions. This outcome reveals that the LMC disc existed since the very earlyepoch of the galaxy formation and experienced the steep relatively fastchemical enrichment shown by its GC metallicities. The four remaining GCsturned out to have circular velocities not compatible with an in situ clusterformation, but rather with being stripped from the SMC.

Accurate radial velocity and metallicity of the Large Magellanic Cloud old globular clusters NGC 1928 and NGC 1939