{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:4HX3BJ43DHMC2TVOZQZDFR6ZDL","short_pith_number":"pith:4HX3BJ43","canonical_record":{"source":{"id":"1705.02721","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-05-08T01:35:19Z","cross_cats_sorted":[],"title_canon_sha256":"88a41cc38730ac2a00e8c916173fba65d35c00d8fbd564fa96c91419ae9ff012","abstract_canon_sha256":"5cd37c8951a61e545f0572ef56f29e424404adb8d897e3058594548ab42bf4c7"},"schema_version":"1.0"},"canonical_sha256":"e1efb0a79b19d82d4eaecc3232c7d91ace65f58e76fda7557580b522e8a8cf63","source":{"kind":"arxiv","id":"1705.02721","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.02721","created_at":"2026-05-18T00:28:35Z"},{"alias_kind":"arxiv_version","alias_value":"1705.02721v1","created_at":"2026-05-18T00:28:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.02721","created_at":"2026-05-18T00:28:35Z"},{"alias_kind":"pith_short_12","alias_value":"4HX3BJ43DHMC","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"4HX3BJ43DHMC2TVO","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"4HX3BJ43","created_at":"2026-05-18T12:30:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:4HX3BJ43DHMC2TVOZQZDFR6ZDL","target":"record","payload":{"canonical_record":{"source":{"id":"1705.02721","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-05-08T01:35:19Z","cross_cats_sorted":[],"title_canon_sha256":"88a41cc38730ac2a00e8c916173fba65d35c00d8fbd564fa96c91419ae9ff012","abstract_canon_sha256":"5cd37c8951a61e545f0572ef56f29e424404adb8d897e3058594548ab42bf4c7"},"schema_version":"1.0"},"canonical_sha256":"e1efb0a79b19d82d4eaecc3232c7d91ace65f58e76fda7557580b522e8a8cf63","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:28:35.482190Z","signature_b64":"6iTlIWGHyjJ3vwUqirWxoT07WBGU27jx02SuEnDfqC7qthZz9rjLL6dOcBky59/sGy3X4KIaLKx01KZWZW+FCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e1efb0a79b19d82d4eaecc3232c7d91ace65f58e76fda7557580b522e8a8cf63","last_reissued_at":"2026-05-18T00:28:35.481521Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:28:35.481521Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1705.02721","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T00:28:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/927UaWJf1FULYcFviclTPXXWz8JQIQw3KAvCRoDyVjMlSxx/5qSjNXvI9RY1oZ7WaN4zGOqRzGqKGTmSfosAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T23:12:27.979591Z"},"content_sha256":"299d42707d61500532a569dcc92e7923f2bf1252f8997ba7da840324b010bf59","schema_version":"1.0","event_id":"sha256:299d42707d61500532a569dcc92e7923f2bf1252f8997ba7da840324b010bf59"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:4HX3BJ43DHMC2TVOZQZDFR6ZDL","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Origin of X-rays in the low state of the FSRQ 3C 273: Evidence of inverse Compton emission","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alok C. Gupta, Gulab C. Dewangan, Kalpana Duorah, Nibedita Kalita, Paul J. Wiita","submitted_at":"2017-05-08T01:35:19Z","abstract_excerpt":"We analyze the 2.5--10 keV X-ray spectra of the luminous quasar 3C 273 and simultaneous observations in UV wavelengths from XMM--Newton between 2000 and 2015. The lowest flux level ever was observed in 2015. The continuum emission from 3C 273 is generally best described by an absorbed power-law but during extremely low states the addition of fluorescence from the K-shell iron line improves the fit. We study the spectral evolution of the source during its extended quiescent state and also examine connections between the X-ray and ultraviolet emissions, which have been seen in some, but not all,"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.02721","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":""},"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":"2026-05-18T00:28:35Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i3vE8VNXFsIw6+juKlm4LF5D/4I0sem6PezEmc3hP1G9dwM6PLKg1CuGtBAkknz4Sq+M3HV4YNK5C1IloiyzDw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-02T23:12:27.979943Z"},"content_sha256":"d07b5abbe533a56e9b5b1d4fe3421aefb24bfd5b9c81d9365e9d9e1a81ca0172","schema_version":"1.0","event_id":"sha256:d07b5abbe533a56e9b5b1d4fe3421aefb24bfd5b9c81d9365e9d9e1a81ca0172"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL/bundle.json","state_url":"https://pith.science/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL/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":"2026-06-02T23:12:27Z","links":{"resolver":"https://pith.science/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL","bundle":"https://pith.science/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL/bundle.json","state":"https://pith.science/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4HX3BJ43DHMC2TVOZQZDFR6ZDL/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:4HX3BJ43DHMC2TVOZQZDFR6ZDL","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":"5cd37c8951a61e545f0572ef56f29e424404adb8d897e3058594548ab42bf4c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-05-08T01:35:19Z","title_canon_sha256":"88a41cc38730ac2a00e8c916173fba65d35c00d8fbd564fa96c91419ae9ff012"},"schema_version":"1.0","source":{"id":"1705.02721","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1705.02721","created_at":"2026-05-18T00:28:35Z"},{"alias_kind":"arxiv_version","alias_value":"1705.02721v1","created_at":"2026-05-18T00:28:35Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1705.02721","created_at":"2026-05-18T00:28:35Z"},{"alias_kind":"pith_short_12","alias_value":"4HX3BJ43DHMC","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_16","alias_value":"4HX3BJ43DHMC2TVO","created_at":"2026-05-18T12:30:58Z"},{"alias_kind":"pith_short_8","alias_value":"4HX3BJ43","created_at":"2026-05-18T12:30:58Z"}],"graph_snapshots":[{"event_id":"sha256:d07b5abbe533a56e9b5b1d4fe3421aefb24bfd5b9c81d9365e9d9e1a81ca0172","target":"graph","created_at":"2026-05-18T00:28:35Z","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 analyze the 2.5--10 keV X-ray spectra of the luminous quasar 3C 273 and simultaneous observations in UV wavelengths from XMM--Newton between 2000 and 2015. The lowest flux level ever was observed in 2015. The continuum emission from 3C 273 is generally best described by an absorbed power-law but during extremely low states the addition of fluorescence from the K-shell iron line improves the fit. We study the spectral evolution of the source during its extended quiescent state and also examine connections between the X-ray and ultraviolet emissions, which have been seen in some, but not all,","authors_text":"Alok C. Gupta, Gulab C. Dewangan, Kalpana Duorah, Nibedita Kalita, Paul J. Wiita","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-05-08T01:35:19Z","title":"Origin of X-rays in the low state of the FSRQ 3C 273: Evidence of inverse Compton emission"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1705.02721","kind":"arxiv","version":1},"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":"sha256:299d42707d61500532a569dcc92e7923f2bf1252f8997ba7da840324b010bf59","target":"record","created_at":"2026-05-18T00:28:35Z","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":"5cd37c8951a61e545f0572ef56f29e424404adb8d897e3058594548ab42bf4c7","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2017-05-08T01:35:19Z","title_canon_sha256":"88a41cc38730ac2a00e8c916173fba65d35c00d8fbd564fa96c91419ae9ff012"},"schema_version":"1.0","source":{"id":"1705.02721","kind":"arxiv","version":1}},"canonical_sha256":"e1efb0a79b19d82d4eaecc3232c7d91ace65f58e76fda7557580b522e8a8cf63","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e1efb0a79b19d82d4eaecc3232c7d91ace65f58e76fda7557580b522e8a8cf63","first_computed_at":"2026-05-18T00:28:35.481521Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:28:35.481521Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"6iTlIWGHyjJ3vwUqirWxoT07WBGU27jx02SuEnDfqC7qthZz9rjLL6dOcBky59/sGy3X4KIaLKx01KZWZW+FCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:28:35.482190Z","signed_message":"canonical_sha256_bytes"},"source_id":"1705.02721","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:299d42707d61500532a569dcc92e7923f2bf1252f8997ba7da840324b010bf59","sha256:d07b5abbe533a56e9b5b1d4fe3421aefb24bfd5b9c81d9365e9d9e1a81ca0172"],"state_sha256":"b133d93ae7f501f61e622f2c582eccb217804e5358354b26714bd348533e3a98"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"MQSevl5MXJOW43zo0I5pgDdDZ11YwghUJLsuo9aDZ3PHUnocOJFhO2ovpQQQaOYZy7edJ9apiZ8DebTSXeWbCQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-02T23:12:27.982028Z","bundle_sha256":"ee6c30fb896285ee7445f7b1c63381e76b9b9fc801af9528bf3915d45cdaa797"}}