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The most recent radio observations up to 200 days post-merger suggest that the afterglow has finally peaked and may now be fading, but fading has not been confirmed in the X-rays. We present new, deep Chandra observations of GW170817/GRB170817A at 260 days post-merger that reveal an X-ray flux of F{0.3-8keV} = 1.1 x 10^-14 erg/s/cm^2, and confirm that the X-ray light curv"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1805.04093","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-05-10T17:47:12Z","cross_cats_sorted":[],"title_canon_sha256":"88441c67326277c5dc9a1bad2c81dfc986cfdc004903feeadaaf35fd5fd7840f","abstract_canon_sha256":"7475f98c9ea74b3db87e46293cf9f2e9cf1425a0556a34a0cdf383a2c64becf0"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:41.809054Z","signature_b64":"DDGE+ToCHY/xDrX1HYuvGEFDeS/Q3WKAEBsdyD4NPFBkkVsUAx3MGKy9K7QrZwL8cYPj4guaGhA/GA8XA45+Cg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2c2a8e7816c59206ef3fb88bdaf66723f6690bb516abd1a3f2f02bc4d2c48059","last_reissued_at":"2026-05-18T00:08:41.808490Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:41.808490Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Fading of the X-ray Afterglow of Neutron Star Merger GW170817/GRB170817A at 260 days","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Daryl Haggard, John J. 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