doi:10.1103/krf3-lm4sengLecce, FrancescaLella, AlessandroLucente, GiuseppeVijayan, VimalBauswein, AndreasGiannotti, MaurizioMirizzi, AlessandroProbing axionlike particles with multimessenger observations of neutron star mergersART-2025-144931AAxion-like particles (ALPs) can be copiously produced in binary neutron star (BNS) mergers through nucleon-nucleon bremsstrahlung if the ALP-nucleon couplings ⁢ are sizable. The ALP-photon coupling ⁢ may trigger conversions of ultralight ALPs into photons in the magnetic fields of the merger remnant and of the Milky Way. This effect would lead to a potentially observable short gamma-ray signal, in coincidence with the gravitational-wave signal produced during the merging process. This event could be detected through multimessenger observation of BNS mergers employing the synergy between gravitational-wave detectors and gamma-ray telescopes. Here, we study the sensitivity of current and proposed MeV gamma-ray experiments to detect such a signal. As an explicit example, we consider ALP couplings related as in the Kim-Shifman-Vainshtein-Zakharov axion model, and show that in this case the proposed instruments can reach a sensitivity down to ⁢ ≳few ×10−13  GeV−1 for ≲10−9  eV, comparable with the SN 1987A limit.2025http://zaguan.unizar.es/record/16231110.1103/krf3-lm4shttp://zaguan.unizar.es/record/162311oai:zaguan.unizar.es:162311info:eu-repo/grantAgreement/EUR/ERC-2017-AdG-788781info:eu-repo/grantAgreement/ES/MICINN/PGC2022-126078NB-C21info:eu-repo/grantAgreement/ES/MICINN/PID2019-108122GB-C31Physical Review D 112, 2 (2025), 023001 [19 pp.]All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess