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The second repeating fast radio burst source, FRB 180814.J0422+73, wasdetected recently by the CHIME collaboration. We use the ten-year Fermi LargeArea Telescope (LAT) archival data to place a flux upper limit in the energyrange of 100 MeV$-$10 GeV at the position of the source, which is $\sim10^{-11}$ erg cm$^{-2}$ s$^{-1}$ for a six-month time bin on average, and$2.35\times 10^{-12}$ erg cm$^{-2}$ s$^{-1}$ for the entire ten-year time span.For the maximum redshift of $z=0.11$, the ten-year upper limit of luminosity is$7.32\times 10^{43}$ erg s$^{-1}$. We utilize these upper limits to constrainthe FRB progenitor and central engine. For the rotation-powered young magnetarmodel, the upper limits can pose constraints on the allowed parameter space forthe initial rotational period and surface magnetic field of the magnetar. Wealso place significant constraints on the kinetic energy of a relativisticexternal shock wave, ruling out the possibility that there existed a gamma-rayburst (GRB) beaming towards earth during the past ten years as the progenitorof the repeater. The case of an off-beam GRB is also constrained if the viewingangle is not much greater than the jet opening angle. All these constraints aremore stringent if FRB 180814.J0422+73 is at a closer distance.

Second Repeating FRB 180814.J0422+73: Ten-year Fermi-LAT Upper limits and Implications