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We perform a detailed spectral study of a recent flaring activity from theFlat Spectrum Radio Quasar (FSRQ), 3C\,454.3, observed simultaneously inoptical, UV, X-ray and $\gamma$-ray energies during 16 to 28 August, 2015. Thesource reached its peak $\gamma$-ray flux of $(1.9\pm0.2)\times\,10^{-05} \;{\rm ph\,cm^{-2}\,s^{-1}}$ on 22 August. The time averaged broadband spectralenergy distribution (SED) is obtained for three time periods, namely "flaringstate"; covering the peak $\gamma$-ray flux, "post flaring state"; immediatelyfollowing the peak flare and "quiescent state"; separated from the flaringevent and following the post flaring state. The SED corresponding to theflaring state is investigated using different emission models involvingsynchrotron, synchrotron self Compton (SSC) and external Compton (EC)mechanisms. Our study suggests that the X-ray and $\gamma$-ray emission from3C\,454.3 cannot be attributed to a single emission mechanism and instead, oneneeds to consider both SSC and EC mechanisms. Moreover, the target photonenergy responsible for the EC process corresponds to an equivalent temperatureof 564 K, suggesting that the flare location lies beyond the broad lineemitting region of the FSRQ. SED fitting of the other two flux states furthersupports these inferences.

Clues on High Energy Emission Mechanism from Blazar 3C 454.3 during 2015 August Flare