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Famously, the 2017 multi-messenger observation of GW170817 (refs. <jats:sup>1,2<\/jats:sup>) led to scientific discoveries across cosmology<jats:sup>3<\/jats:sup>, nuclear physics<jats:sup>4\u20136<\/jats:sup> and gravity<jats:sup>7<\/jats:sup>. Central to these results were the sky localization and distance obtained from the GW data, which, in the case of GW170817, helped to identify the associated electromagnetic transient, AT 2017gfo (ref. <jats:sup>8<\/jats:sup>), 11\u2009h after the GW signal. Fast analysis of GW data is critical for directing time-sensitive electromagnetic observations. However, owing to challenges arising from the length and complexity of signals, it is often necessary to make approximations that sacrifice accuracy. Here we present a machine-learning framework that performs complete binary neutron star inference in just 1\u2009s without making any such approximations. Our approach enhances multi-messenger observations by providing: (1) accurate localization even before the merger; (2) improved localization precision by around 30% compared to approximate low-latency methods; and (3) detailed information on luminosity distance, inclination and masses, which can be used to prioritize expensive telescope time. Additionally, the flexibility and reduced cost of our method open new opportunities for equation-of-state studies. Finally, we demonstrate that our method scales to long signals, up to an hour in length, thus serving as a blueprint for data analysis for next-generation ground- and space-based detectors.<\/jats:p>","DOI":"10.1038\/s41586-025-08593-z","type":"journal-article","created":{"date-parts":[[2025,3,5]],"date-time":"2025-03-05T16:04:10Z","timestamp":1741190650000},"page":"49-53","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":45,"title":["Real-time inference for binary neutron star mergers using machine learning"],"prefix":"10.1038","volume":"639","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8798-0627","authenticated-orcid":false,"given":"Maximilian","family":"Dax","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6987-6313","authenticated-orcid":false,"given":"Stephen R.","family":"Green","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1671-3668","authenticated-orcid":false,"given":"Jonathan","family":"Gair","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7287-5151","authenticated-orcid":false,"given":"Nihar","family":"Gupte","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3329-9788","authenticated-orcid":false,"given":"Michael","family":"P\u00fcrrer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vivien","family":"Raymond","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonas","family":"Wildberger","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jakob H.","family":"Macke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5433-1409","authenticated-orcid":false,"given":"Alessandra","family":"Buonanno","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8177-0925","authenticated-orcid":false,"given":"Bernhard","family":"Sch\u00f6lkopf","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2025,3,5]]},"reference":[{"key":"8593_CR1","doi-asserted-by":"publisher","first-page":"161101","DOI":"10.1103\/PhysRevLett.119.161101","volume":"119","author":"BP Abbott","year":"2017","unstructured":"Abbott, B. 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