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Fast Radio Bursts (FRBs) are a mysterious flash phenomenon detected in radiowavelengths with a duration of only a few milliseconds, and they may also haveprompt gamma-ray flashes. Here we carry out a blind search for msec-durationgamma-ray flashes using the 7-year Fermi Large Area Telescope (Fermi-LAT)all-sky gamma-ray data. About 100 flash candidates are detected, but afterremoving those associated with bright steady point sources, we find no flashevents at high Galactic latitude region (|b|>20 deg). Events at lower latituderegions are consistent with statistical flukes originating from the diffusegamma-ray background. From these results, we place an upper limit on the GeVgamma-ray to radio flux ratio of FRBs as xi \equiv (nu L_nu)_gamma / (nuL_nu)_radio < 10^8, depending on the assumed FRB rate evolution. This limit iscomparable with the largest value found for pulsars, though xi of pulsars isdistributed in a wide range. We also compare this limit with the spectralenergy distribution of the 2004 giant flare of the magnetar SGR 1806-20.

A Blind Search for Prompt Gamma-ray Counterparts of Fast Radio Bursts with Fermi-LAT Data