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Based on the experience gained during the four and a half years of themission, the Fermi -LAT collaboration has undertaken a comprehensive revisionof the event-level analysis going under the name of Pass 8. Although it is notyet finalized, we can test the improvements in the new event reconstructionwith the special case of the prompt phase of bright Gamma-Ray Bursts (GRBs),where the signal to noise ratio is large enough that loose selection cuts aresufficient to identify gamma- rays associated with the source. Using the newevent reconstruction, we have re-analyzed ten GRBs previously detected by theLAT for which an x-ray/optical follow-up was possible and found four new gammarays with energies greater than 10 GeV in addition to the seven previouslyknown. Among these four is a 27.4 GeV gamma-ray from GRB 080916C, which has aredshift of 4.35, thus making it the gamma ray with the highest intrinsicenergy (147 GeV) detected from a GRB. We present here the salient aspects ofthe new event reconstruction and discuss the scientific implications of thesenew high-energy gamma rays, such as constraining extragalactic background lightmodels, Lorentz invariance violation (LIV) tests, the prompt emission mechanismand the bulk Lorentz factor of the emitting region.

New Fermi-LAT event reconstruction reveals more high-energy gamma rays from Gamma-ray bursts