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We report the first gas-phase metallicity map of a distant galaxy measuredwith the James Webb Space Telescope (JWST). We use the NIRISS slitlessspectroscopy acquired by the GLASS Early Release Science program to spatiallyresolve the rest-frame optical nebular emission lines in a gravitationallylensed galaxy at $z=3.06$ behind the Abell 2744 galaxy cluster. This galaxy(dubbed GLASS-Zgrad1) has stellar mass $\sim10^{8.6} M_\odot$, instantaneousstar formation rate $\sim8.6$ $M_\odot$/yr (both corrected for lensingmagnification), and global metallicity one-fourth solar. From its emission linemaps ([O III], H$\beta$, H$\gamma$, [Ne III], and [O II]) we derive its spatialdistribution of gas-phase metallicity using a well-established forward-modelingBayesian inference method. The exquisite resolution and sensitivity ofJWST/NIRISS, combined with lensing magnification, enable us to resolve this$z\sim3$ dwarf galaxy in $\gtrsim$50 resolution elements with sufficientsignal, an analysis hitherto not possible. We find that the radial metallicitygradient of GLASS-Zgrad1 is strongly inverted (i.e. positive): $\Delta\log({\rmO/H})/\Delta r$ = $0.165\pm0.023$ $\mathrm{dex~kpc^{-1}}$. This invertedgradient may be due to tidal torques induced by a massive nearby ($\sim$15 kpcprojected) galaxy, which can cause inflows of metal-poor gas into the centralregions of GLASS-Zgrad1. These first results showcase the power of JWSTwide-field slitless spectroscopic modes to resolve the mass assembly andchemical enrichment of low-mass galaxies in and beyond the peak epoch of cosmicstar formation ($z\gtrsim2$). Reaching masses $\lesssim 10^9~M_\odot$ at theseredshifts is especially valuable to constrain the effects of galactic feedbackand environment, and is possible only with JWST's new capabilities.

Early results from GLASS-JWST. IV: Spatially resolved metallicity in a low-mass $z\sim3$ galaxy with NIRISS