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We report the first detections of the repeating fast radio burst source FRB121102 above 5.2 GHz. Observations were performed using the 4$-$8 GHz receiverof the Robert C. Byrd Green Bank Telescope with the Breakthrough Listen digitalbackend. We present the spectral, temporal and polarization properties of 21bursts detected within the first 60 minutes of a total 6-hour observations.These observations comprise the highest burst density yet reported in theliterature, with 18 bursts being detected in the first 30 minutes. A few burstsclearly show temporal sub-structures with distinct spectral properties. Thesesub-structures superimpose to provide enhanced peak signal-to-noise ratio athigher trial dispersion measures. Broad features occur in $\sim 1$ GHz widesubbands that typically differ in peak frequency between bursts within theband. Finer-scale structures ($\sim 10-50$ MHz) within these bursts areconsistent with that expected from Galactic diffractive interstellarscintillation. The bursts exhibit nearly 100% linear polarization, and a largeaverage rotation measure of 9.359$\pm$0.012 $\times$ 10$^{\rm 4}$ rad m$^{\rm-2}$ (in the observer's frame). No circular polarization was found for anyburst. We measure an approximately constant polarization position angle in the13 brightest bursts. The peak flux densities of the reported bursts haveaverage values (0.2$\pm$0.1 Jy), similar to those seen at lower frequencies($<3$ GHz), while the average burst widths (0.64$\pm$0.46 ms) are relativelynarrower.

Highest-frequency detection of FRB 121102 at 4-8 GHz using the Breakthrough Listen Digital Backend at the Green Bank Telescope