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We present the limits on photon to axionlike particle (ALP) coupling from the10-year period observations of the TeV BL Lacertae blazar 1ES 1215+303 (withredshift $z=0.130$). The contemporaneous gamma-ray spectra are measured by thecollaborations Fermi-LAT and VERITAS with five flux phases from 2008 to 2017,including four low states and one flare. Using these flux phases, we show thespectral energy distributions (SEDs) under the null/ALP hypotheses and set thecombined limit on ALP. The 95% $\rm C.L.$ combined limit set by 1ES 1215+303with the 10-year gamma-ray data is roughly at the photon-ALP coupling constant$g_{a\gamma} \gtrsim 1.5\times 10^{-11} \rm \, GeV^{-1}$ for the ALP mass$5.0\times10^{-10} \, {\rm eV} \lesssim m_a \lesssim 1.0\times10^{-7} \, {\rmeV}$.

Axion limits from the 10-year gamma-ray emission 1ES 1215+303