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The extragalactic background light (EBL), from ultraviolet to infraredwavelengths, is predominantly due to emission from stars, accreting black holesand reprocessed light due to Galactic dust. The EBL can be studied through theimprint it leaves, via $\gamma$-$\gamma$ absorption of high-energy photons, inthe spectra of distant $\gamma$-ray sources. The EBL has been probed throughthe search for the attenuation it produces in the spectra of BL Lacertae (BLLac) objects and individual $\gamma$-ray bursts (GRBs). GRBs have significantadvantages over blazars for the study of the EBL especially at high redshifts.Here we analyze a combined sample of twenty-two GRBs, detected by the FermiLarge Area Telescope between 65 MeV and 500 GeV. We report a marginal detection(at the ~2.8 $\sigma$ level) of the EBL attenuation in the stacked spectra ofthe source sample. This measurement represents a first constraint of the EBL atan effective redshift of ~1.8. We combine our results with prior EBLconstraints and conclude that Fermi-LAT is instrumental to constrain the UVcomponent of the EBL. We discuss the implications on existing empirical modelsof EBL evolution.

Probing the EBL evolution at high redshift using GRBs detected with the Fermi-LAT