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The energy output in the gamma-ray burst (GRB) prompt emission and afterglowphase is expected to photoionize the surrounding medium out to large radii.Cooling of this gas produces line emission, particularly strong in the optical,whose variability is a strong diagnostics of the gas density and geometry inthe close environment of the burst. We present the results of a spectral timeseries analysis of the host galaxy of GRB 990712 observed up to ~6 years afterthe burst. We analyze the emission line fluxes together with those of theprevious observations of the same GRB, in search for photoionizationsignatures. We find that the emission line fluxes show no variation within theuncertainities up to 6 years after the burst, and we use the measured lineintensities to set a limit on the density of the gas within a few parsecs ofthe burst location. This is the first time that emission from cooling GRBremnants is probed on years time scales.Comment: 5 pages, 3 figures, accepted for publication in A&

Constraining the environment of GRB 990712 through emission line fluxes