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The metastable hypermassive neutron star produced in the coalescence of twoneutron stars can copiously produce axions that radiatively decay into$\mathcal{O}(100)$~MeV photons. These photons can form a fireball withcharacteristic temperature smaller than $1\rm\, MeV$. By relying on X-rayobservations of GW170817/GRB 170817A with CALET CGBM, Konus-Wind, andInsight-HXMT/HE, we present new bounds on the axion-photon coupling for axionmasses in the range $1$-$400\,\rm MeV$. We exclude couplings down to $5\times10^{-11}\,\rm GeV^{-1}$, complementing and surpassing existing constraints. Ourapproach can be extended to any feebly-interacting particle decaying intophotons.

Multimessenger Constraints on Radiatively Decaying Axions from GW170817