{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:S3KMTTEW5UQ3XTES25ZYWRYGG2","short_pith_number":"pith:S3KMTTEW","canonical_record":{"source":{"id":"1306.4365","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-06-18T21:40:36Z","cross_cats_sorted":[],"title_canon_sha256":"bf683e4a3358b1b66bff64486da5fe3a5c26834ffddc81508e8a773704ca7bc1","abstract_canon_sha256":"847a379684f45d3e4a568dfd834492ecd204062c8e0646ecffbea6800d11d43c"},"schema_version":"1.0"},"canonical_sha256":"96d4c9cc96ed21bbcc92d7738b4706369dcf60a89e9f014cf1e5f74c6105854a","source":{"kind":"arxiv","id":"1306.4365","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.4365","created_at":"2026-05-18T01:49:15Z"},{"alias_kind":"arxiv_version","alias_value":"1306.4365v2","created_at":"2026-05-18T01:49:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.4365","created_at":"2026-05-18T01:49:15Z"},{"alias_kind":"pith_short_12","alias_value":"S3KMTTEW5UQ3","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"S3KMTTEW5UQ3XTES","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"S3KMTTEW","created_at":"2026-05-18T12:27:59Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:S3KMTTEW5UQ3XTES25ZYWRYGG2","target":"record","payload":{"canonical_record":{"source":{"id":"1306.4365","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-06-18T21:40:36Z","cross_cats_sorted":[],"title_canon_sha256":"bf683e4a3358b1b66bff64486da5fe3a5c26834ffddc81508e8a773704ca7bc1","abstract_canon_sha256":"847a379684f45d3e4a568dfd834492ecd204062c8e0646ecffbea6800d11d43c"},"schema_version":"1.0"},"canonical_sha256":"96d4c9cc96ed21bbcc92d7738b4706369dcf60a89e9f014cf1e5f74c6105854a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:49:15.196899Z","signature_b64":"ARnmojvO15Rlq2guGddqgMzBNjH1jyzQnUhDNTroometbeDnVPx/GDKxCUjIAXb0+egV5eMtkVdpuhn69v9SAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"96d4c9cc96ed21bbcc92d7738b4706369dcf60a89e9f014cf1e5f74c6105854a","last_reissued_at":"2026-05-18T01:49:15.196342Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:49:15.196342Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1306.4365","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:49:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"3oPIWpvrPlUgyq2M8+1JuQOgeHx4bAXgHi/gyF3OugjvgNadHDLJAiu3lQE0DT+/HXEGde431sflQtPazminBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T01:31:28.648021Z"},"content_sha256":"1344704d8ac1a6a4d1c3822ff983f666bf406f62703b2c94a022c104fa5b6f28","schema_version":"1.0","event_id":"sha256:1344704d8ac1a6a4d1c3822ff983f666bf406f62703b2c94a022c104fa5b6f28"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:S3KMTTEW5UQ3XTES25ZYWRYGG2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Results of the Swift Monitoring Campaign of the X-ray Binary 4U 1957+11: Constraints on Binary Parameters","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Dipankar Maitra (Wheaton College, Jon M. Miller, MA), Mark T. Reynolds, Mike Nowak (MIT), Rubens Reis (Univ. of Michigan)","submitted_at":"2013-06-18T21:40:36Z","abstract_excerpt":"We present new results of uniform spectral analysis of Swift/XRT observations of the X-ray binary system 4U 1957+11. This includes 26 observations of the source made between MJD 54282$-$55890 (2007 July 01 $-$ 2011 November 25). All 26 spectra are predominantly thermal, and can be modeled well with emission from an accretion disk around a black hole. We analyze all 26 spectra jointly using traditional chi-squared fitting as well as Markov Chain Monte Carlo simulations. The results from both methods agree, and constrains on model parameters like inclination, column density, and black hole spin."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.4365","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:49:15Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"RGBhwO4uOxLPFLJSzpS3rHYP8VBvKeDhbe/n/moXm2tHk8VkSotVORyW4HzD5hhsr0BKaGbVyG3faXojTilQDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-01T01:31:28.648719Z"},"content_sha256":"44d3272668da4bdbecc48361da6806af671fe4323d354211931bd5d1d95ec2de","schema_version":"1.0","event_id":"sha256:44d3272668da4bdbecc48361da6806af671fe4323d354211931bd5d1d95ec2de"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2/bundle.json","state_url":"https://pith.science/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-01T01:31:28Z","links":{"resolver":"https://pith.science/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2","bundle":"https://pith.science/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2/bundle.json","state":"https://pith.science/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/S3KMTTEW5UQ3XTES25ZYWRYGG2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:S3KMTTEW5UQ3XTES25ZYWRYGG2","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"847a379684f45d3e4a568dfd834492ecd204062c8e0646ecffbea6800d11d43c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-06-18T21:40:36Z","title_canon_sha256":"bf683e4a3358b1b66bff64486da5fe3a5c26834ffddc81508e8a773704ca7bc1"},"schema_version":"1.0","source":{"id":"1306.4365","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1306.4365","created_at":"2026-05-18T01:49:15Z"},{"alias_kind":"arxiv_version","alias_value":"1306.4365v2","created_at":"2026-05-18T01:49:15Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1306.4365","created_at":"2026-05-18T01:49:15Z"},{"alias_kind":"pith_short_12","alias_value":"S3KMTTEW5UQ3","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_16","alias_value":"S3KMTTEW5UQ3XTES","created_at":"2026-05-18T12:27:59Z"},{"alias_kind":"pith_short_8","alias_value":"S3KMTTEW","created_at":"2026-05-18T12:27:59Z"}],"graph_snapshots":[{"event_id":"sha256:44d3272668da4bdbecc48361da6806af671fe4323d354211931bd5d1d95ec2de","target":"graph","created_at":"2026-05-18T01:49:15Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We present new results of uniform spectral analysis of Swift/XRT observations of the X-ray binary system 4U 1957+11. This includes 26 observations of the source made between MJD 54282$-$55890 (2007 July 01 $-$ 2011 November 25). All 26 spectra are predominantly thermal, and can be modeled well with emission from an accretion disk around a black hole. We analyze all 26 spectra jointly using traditional chi-squared fitting as well as Markov Chain Monte Carlo simulations. The results from both methods agree, and constrains on model parameters like inclination, column density, and black hole spin.","authors_text":"Dipankar Maitra (Wheaton College, Jon M. Miller, MA), Mark T. Reynolds, Mike Nowak (MIT), Rubens Reis (Univ. of Michigan)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-06-18T21:40:36Z","title":"Results of the Swift Monitoring Campaign of the X-ray Binary 4U 1957+11: Constraints on Binary Parameters"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1306.4365","kind":"arxiv","version":2},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:1344704d8ac1a6a4d1c3822ff983f666bf406f62703b2c94a022c104fa5b6f28","target":"record","created_at":"2026-05-18T01:49:15Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"847a379684f45d3e4a568dfd834492ecd204062c8e0646ecffbea6800d11d43c","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-06-18T21:40:36Z","title_canon_sha256":"bf683e4a3358b1b66bff64486da5fe3a5c26834ffddc81508e8a773704ca7bc1"},"schema_version":"1.0","source":{"id":"1306.4365","kind":"arxiv","version":2}},"canonical_sha256":"96d4c9cc96ed21bbcc92d7738b4706369dcf60a89e9f014cf1e5f74c6105854a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"96d4c9cc96ed21bbcc92d7738b4706369dcf60a89e9f014cf1e5f74c6105854a","first_computed_at":"2026-05-18T01:49:15.196342Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:49:15.196342Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"ARnmojvO15Rlq2guGddqgMzBNjH1jyzQnUhDNTroometbeDnVPx/GDKxCUjIAXb0+egV5eMtkVdpuhn69v9SAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:49:15.196899Z","signed_message":"canonical_sha256_bytes"},"source_id":"1306.4365","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1344704d8ac1a6a4d1c3822ff983f666bf406f62703b2c94a022c104fa5b6f28","sha256:44d3272668da4bdbecc48361da6806af671fe4323d354211931bd5d1d95ec2de"],"state_sha256":"03ae1cc52c718fb246897ef15645a42f796845ff07961198180d56831101a504"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"PYwOa/y5MALB6Uv62IACZgcpczrILf/ghypwg+LZlNWyElT5VwJ/X2eHmDHQg+aWD7uf/KneF1tQtvwxdANLAA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-01T01:31:28.652680Z","bundle_sha256":"f244dfd14c63e7696d75892aa089985159856520c9411970fce788c2c121c1a1"}}