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The CIII] and CIV rest-frame UV emission lines are powerful probes of theionizations states of galaxies. They have furthermore been suggested asalternatives for spectroscopic redshift confirmation of objects at the epoch ofreionization ($z>6$), where the most frequently used redshift indicator,Ly$\alpha$, is attenuated by the high fraction of neutral hydrogen in theinter-galactic medium. However, currently only very few confirmations of carbonUV lines at these high redshifts exist, making it challenging to quantify theseclaims. Here, we present the detection of CIV$\lambda\lambda$1548,1551\AA\ in\HST\ slitless grism spectroscopy obtained by GLASS of a Ly$\alpha$ emitter at$z=6.11$ multiply imaged by the massive foreground galaxy cluster RXJ2248. TheCIV emission is detected at the 3--5$\sigma$ level in two images of the source,with marginal detection in two other images. We do not detect significantCIII]$\lambda\lambda$1907,1909\AA\ emission implying an equivalent widthEW$_\textrm{CIII]}<20$\AA\ (1$\sigma$) and $\textrm{CIV/CIII}>0.7$ (2$\sigma$).Combined with limits on the rest-frame UV flux from the HeII$\lambda$1640\AA\emission line and the OIII]$\lambda\lambda$1661,1666\AA\ doublet, we putconstraints on the metallicity and the ionization state of the galaxy. Theestimated line ratios and equivalent widths do not support a scenario where anAGN is responsible for ionizing the carbon atoms. SED fits including nebularemission lines imply a source with a mass of log(M/M$_\odot)\sim9$, SFR ofaround 10M$_\odot$/yr, and a young stellar population $<50$Myr old. The sourceshows a stronger ionizing radiation field than objects with detected CIVemission at $z<2$ and adds to the growing sample of low-mass(log(M/M$_\odot)\lesssim9$) galaxies at the epoch of reionization with strongradiation fields from star formation.

The Grism Lens-Amplified Survey from Space (GLASS). XI. Detection of CIV in Multiple Images of $z=6.11$ Ly$\alpha$ Emitter Behind RXCJ2248.7-4431