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An exceptional $\gamma$-ray outburst from 3C 279 is detected by {\itFermi}-Large Area Telescope (LAT) in 2015 June. In the energy range of0.1$-$300 GeV, the highest flux measured is (39.1$\pm$2.5) $\times$ 10$^{-6}$\phflux, which is the highest $\gamma$-ray flux ever detected from 3C 279,exceeding the previous historically brightest flare observed by {\it EGRET} in1996. The high activity period consists of three major flares with the last onebeing the brightest. All but one flares show a faster rise and slower decaypattern and at the peak of the activity, the $\gamma$-ray spectrum is found toshow a clear signature of break/curvature. The obtained spectral parametershint for the peak of the inverse Compton emission to lie in the LAT energyrange (around $\sim$1 GeV) which is in contrast to that seen during the 2013December and 2014 April $\gamma$-ray flares of 3C 279. From the $\gamma\gamma$pair opacity arguments, the minimum Doppler factor is estimated to be 14 andthe location of the $\gamma$-ray emitting region is found to be either at theouter edge of the broad line region or farther out from it.

Fermi-Large Area Telescope Observations of the Exceptional Gamma-ray Flare from 3C 279 in 2015 June