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Recently the IceCube collaboration and 15 other collaborations reported thespatial and temporal coincidence between the neutrino event IceCube-170922A andthe radio-TeV activity of the blazar TXS 0506+056. Their further analysis on9.5 years of IceCube data discovered neutrino flare between September 2014 andMarch 2015, when TXS 0506+056 is however in "quiescent" state. We analyze theFermi-LAT data in that direction, and find another bright GeV source PKS0502+049, which is at an angle of $1.2^{\circ}$ from TXS 0506+056, with strongactivties during the neutrino flare. No other bright GeV source was detected inthe region of interest. Though PKS 0502+049 is $1.2^\circ$ separated from TXS0506+056, it locates within the directional reconstruction uncertainties of 7neutrinos, out of the 13 neutrino events during the neutrino flare. Togetherwith the observed high flux of the $\gamma$-ray flare, it may be unreasonableto fully discard the (partial) contribution of PKS 0502+049 to the neutrinoflare. The single source assumption used in the neutrino data analysis mightneed to be revisited.

Search for GeV flare coincident with the IceCube neutrino flare