Fermi LAT photon flux gamma-ray light curve of the blazar 3C 279

This dataset is the gamma-ray photon flux light curve of the blazar 3C 279 analyzed in Blinov et al. \"Repeated pattern of gamma-ray flares in the lightcurve of the blazar 3C 279\" paper. In order to obtain it we analysed the Fermi Large Area Telescope (LAT) data in the energy range 100 MeV <= E <= 300 GeV using the unbinned likelihood analysis of the standard Fermi analysis software package Fermitools (v. 1.2.23) distributed under Conda. The light curve is calculated with 1.35 days binning. It is over-sampled in such a way that the distance between consecutive points equals to half of the integration time. We used the instrument response function P8R3_SOURCE_V2. Source class photons (evclass=128 and evtype=3) were selected within a 15 deg region of interest (ROI) centered on 3C 279. A cut on the satellite zenith angle (< 90 deg) was enabled to exclude the Earth limb background. The Galactic interstellar emission was accounted for using the gll_iem_v07 spatial model. The extragalactic diffuse and residual instrumental backgrounds were included in the fit as an isotropic spectral template iso_P8R3_SOURCE_V2_v1.txt. The background models include all sources from the 4FGL within 15 deg of the blazar. Photon fluxes of sources beyond 10 deg from 3C 279 and spectral shapes of all targets were fixed to their values reported in 4FGL. The source is considered to be detected if the test statistic, TS, provided by the analysis exceeds 10, which corresponds to approximately a 3 sigma detection level.