Multiwavelength observations of the Blazar 4C + 28.07

The active galactic nucleus 4C +28.07 is a flat spectrum radio quasar, one of the brightest at $\gamma$-ray energies. We study its multi-wavelength emission by analysing $\sim12.3$ years \textit{Fermi-LAT} data in band and \textit{Swift-XRT/UVOT} available X-ray Optical-to-Ultraviolet bands. In band, five flaring periods have been detected, during which flux dramatically increases several times (>5) compared with average quiescent phase. Quasi-simultaneously times, UVOT detected also analysed. flare (Flare 5; observed on Oct 12, 2018) reached $(6.7\pm0.81)\times 10^{-6}$ photon/cm^2/s ($\sim31\times$ higher than mean over 12.3 years) detection significance $\sigma=6.1$. apparent luminosity this corresponds to $3.6\times10^{49}$ erg/s (for distance 8.38 Gpc), highest luminosities for blazars. Flare 5 has an estimated $\sim2$ hours time block, can be considered variability time. constrains emitting region size <9e14 cm, close black hole radius. spectral energy distributions (SEDs) show early cut-off $\sim14$ GeV; beyond $\sim60$ GeV, however, hardens up $\sim316$ GeV. Similar behaviour noticeable SEDs flares, linked photon absorption region's internal external narrow-band radiation fields. Considering obtained results from 4C\,+28.07, we parameters 3C\,279 M87, motivate further studies.