{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2025:PWXZUVN5RVLN7JMM76ZE7E42M4","short_pith_number":"pith:PWXZUVN5","schema_version":"1.0","canonical_sha256":"7daf9a55bd8d56dfa58cffb24f939a673d1dbc375b20ae68f633b12e8e575cc4","source":{"kind":"arxiv","id":"2506.12125","version":1},"attestation_state":"computed","paper":{"title":"The optical constants and grain sizes of interstellar dust measured directly using the dust scattered x-ray halo of GRB 221009A","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Albert Sneppen, Darach Watson","submitted_at":"2025-06-13T18:00:00Z","abstract_excerpt":"X-ray scattering is a powerful probe of the optical constants and grain size distribution of interstellar dust. Bright, transient sources are excellent tools for this, since they fade rapidly, leaving only the expanding scattered x-ray halo. Here, we analyse the dust-scattered x-ray halo data of the unprecedentedly bright $\\gamma$-ray burst, GRB 221009A, using anomalous diffraction theory to measure the grain size distribution of dust in the Galaxy as well as the complex refractive index, $m$, and use these results to infer the likely composition. We find a complex refractive index, $m=n+ik$ a"},"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":"2506.12125","kind":"arxiv","version":1},"metadata":{"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.HE","submitted_at":"2025-06-13T18:00:00Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"6882f98455dbb6bb0d80f5681d28d797946bc8b8b072275570a367d3554e86d9","abstract_canon_sha256":"f3283799d3e6d8674642e9357bae47da10d360324770451962bed693308d425a"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T12:03:27.403429Z","signature_b64":"x1Dlao3Rc4YvvEK0Yan7fe3G7R+Q/QqoZa8XlcGXe6kuea8lTuU3o6nYBAJEetdA74Fv3vc6uU7h/H52BY8ACw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7daf9a55bd8d56dfa58cffb24f939a673d1dbc375b20ae68f633b12e8e575cc4","last_reissued_at":"2026-07-05T12:03:27.402929Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T12:03:27.402929Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The optical constants and grain sizes of interstellar dust measured directly using the dust scattered x-ray halo of GRB 221009A","license":"http://creativecommons.org/licenses/by/4.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.HE","authors_text":"Albert Sneppen, Darach Watson","submitted_at":"2025-06-13T18:00:00Z","abstract_excerpt":"X-ray scattering is a powerful probe of the optical constants and grain size distribution of interstellar dust. Bright, transient sources are excellent tools for this, since they fade rapidly, leaving only the expanding scattered x-ray halo. Here, we analyse the dust-scattered x-ray halo data of the unprecedentedly bright $\\gamma$-ray burst, GRB 221009A, using anomalous diffraction theory to measure the grain size distribution of dust in the Galaxy as well as the complex refractive index, $m$, and use these results to infer the likely composition. We find a complex refractive index, $m=n+ik$ a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2506.12125","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2506.12125/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"aliases":[{"alias_kind":"arxiv","alias_value":"2506.12125","created_at":"2026-07-05T12:03:27.402986+00:00"},{"alias_kind":"arxiv_version","alias_value":"2506.12125v1","created_at":"2026-07-05T12:03:27.402986+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2506.12125","created_at":"2026-07-05T12:03:27.402986+00:00"},{"alias_kind":"pith_short_12","alias_value":"PWXZUVN5RVLN","created_at":"2026-07-05T12:03:27.402986+00:00"},{"alias_kind":"pith_short_16","alias_value":"PWXZUVN5RVLN7JMM","created_at":"2026-07-05T12:03:27.402986+00:00"},{"alias_kind":"pith_short_8","alias_value":"PWXZUVN5","created_at":"2026-07-05T12:03:27.402986+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4","json":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4.json","graph_json":"https://pith.science/api/pith-number/PWXZUVN5RVLN7JMM76ZE7E42M4/graph.json","events_json":"https://pith.science/api/pith-number/PWXZUVN5RVLN7JMM76ZE7E42M4/events.json","paper":"https://pith.science/paper/PWXZUVN5"},"agent_actions":{"view_html":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4","download_json":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4.json","view_paper":"https://pith.science/paper/PWXZUVN5","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=2506.12125&json=true","fetch_graph":"https://pith.science/api/pith-number/PWXZUVN5RVLN7JMM76ZE7E42M4/graph.json","fetch_events":"https://pith.science/api/pith-number/PWXZUVN5RVLN7JMM76ZE7E42M4/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4/action/timestamp_anchor","attest_storage":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4/action/storage_attestation","attest_author":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4/action/author_attestation","sign_citation":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4/action/citation_signature","submit_replication":"https://pith.science/pith/PWXZUVN5RVLN7JMM76ZE7E42M4/action/replication_record"}},"created_at":"2026-07-05T12:03:27.402986+00:00","updated_at":"2026-07-05T12:03:27.402986+00:00"}