Abstract PMN J0218–2307 (4FGL J0218.9–2305) is classified as a blazar candidate with unknown type (BCU) in the fourth source catalog from the Fermi Large Area Telescope (Fermi-LAT). With the updated Fermi-LAT Pass 8 data, the γ-ray flaring activity toward PMN J0218–2307 is detected. The test statistic (TS) value of PMN J0218–2307 in energy band of 100 MeV–500 GeV is 133.893 with a significance level of 10.96σ. The maximum-likelihood photon flux is \((8.131 \pm 1.359) \times 10^{-9}\rm ~ph~cm^{-2} s^{-1}\). A significant γ-ray flare in the period from 2008 August 4 to 2019 August 25 is found from the source. The spectral characteristics of GeV energy band of PMN J0218–2307 is similar to that of flat-spectrum radio quasars (FSRQs) in the local Universe.
Keywords radiation mechanisms: non-thermal — gamma rays: galaxies — galaxies: active — galaxies: individual (PMN J0218–2307)
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