{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:NS5R5BBHN37ZK752XSXHEENCCR","short_pith_number":"pith:NS5R5BBH","canonical_record":{"source":{"id":"0907.4982","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-07-28T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"d09bac6242170855dda6f8bf02df6d0b796bf5174c324fea2d3130633c406bca","abstract_canon_sha256":"5e7dec96c164aa81e5b726c8b2154d485ae056c9be180eedc35508ebcffff3dd"},"schema_version":"1.0"},"canonical_sha256":"6cbb1e84276eff957fbabcae7211a214791c8ab84279c961d1eb50057ea7110b","source":{"kind":"arxiv","id":"0907.4982","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.4982","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"arxiv_version","alias_value":"0907.4982v1","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.4982","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"pith_short_12","alias_value":"NS5R5BBHN37Z","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NS5R5BBHN37ZK752","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NS5R5BBH","created_at":"2026-05-18T12:26:00Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:NS5R5BBHN37ZK752XSXHEENCCR","target":"record","payload":{"canonical_record":{"source":{"id":"0907.4982","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-07-28T20:00:05Z","cross_cats_sorted":[],"title_canon_sha256":"d09bac6242170855dda6f8bf02df6d0b796bf5174c324fea2d3130633c406bca","abstract_canon_sha256":"5e7dec96c164aa81e5b726c8b2154d485ae056c9be180eedc35508ebcffff3dd"},"schema_version":"1.0"},"canonical_sha256":"6cbb1e84276eff957fbabcae7211a214791c8ab84279c961d1eb50057ea7110b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:12:46.942557Z","signature_b64":"oQXTtOOZJJWqQY6rQOIEFrpKC3wMmn7YJ7IUZCuU47I3VjG69c2ohSvUOnAFMpxOsyrJz+L3ttNDBLFHO0PoAQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"6cbb1e84276eff957fbabcae7211a214791c8ab84279c961d1eb50057ea7110b","last_reissued_at":"2026-05-18T02:12:46.941821Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:12:46.941821Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0907.4982","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":"2026-05-18T02:12:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/CfHMO94ozidqeowwgt7JXt0Zpe8Up+WJyox8pyxPdMqqr/+P9I0USxwxprb5LjIOlgbDonkErklnNkW0SxKDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T07:05:47.113298Z"},"content_sha256":"c8e40dcd1d8641774b80b04805f5ed198d7e097f06081f70e2adead2621230f5","schema_version":"1.0","event_id":"sha256:c8e40dcd1d8641774b80b04805f5ed198d7e097f06081f70e2adead2621230f5"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:NS5R5BBHN37ZK752XSXHEENCCR","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"1) ((1) University of Crete, 2), (2) IESL, (3) Max-Planck-Institut fur extraterrestrische Physik), Despina Hatzidimitriou (1, Foundation for Research, Paolo Bonfini (1), Physics Department, P. Reig (2, Technology, Wolfgang Pietsch (3)","submitted_at":"2009-07-28T20:00:05Z","abstract_excerpt":"A recent survey of the Local Group spiral galaxy M 31 with XMM-Newton yielded a large number of X-ray sources. This is the second in a series of papers with the aim of identifying the optical counterparts of these X-ray sources. We have obtained optical spectra for 21 bright optical counterparts of 20 X-ray sources in the direction of M 31, using the 1.3-m Skinakas telescope in Crete, Greece. For 17 of the 20 X-ray sources, we have identified the optical counterpart as a normal late type star (of type F or later) in the foreground (i.e. in the Milky Way). For two more sources there were two po"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.4982","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":"2026-05-18T02:12:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gxeg9TkhsZT4jM+pCLVVtr3Ibe6AbkDtLGe2ZPIA1o60LgmClebh6qBpiDOeAFGH0TfK/98Akcx0tZ5Wha1pBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-30T07:05:47.113681Z"},"content_sha256":"07ad4f004520e16a1021078aa4af4bc9d0b7ce7d228599baf28644e45108e8c3","schema_version":"1.0","event_id":"sha256:07ad4f004520e16a1021078aa4af4bc9d0b7ce7d228599baf28644e45108e8c3"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/NS5R5BBHN37ZK752XSXHEENCCR/bundle.json","state_url":"https://pith.science/pith/NS5R5BBHN37ZK752XSXHEENCCR/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/NS5R5BBHN37ZK752XSXHEENCCR/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":"2026-06-30T07:05:47Z","links":{"resolver":"https://pith.science/pith/NS5R5BBHN37ZK752XSXHEENCCR","bundle":"https://pith.science/pith/NS5R5BBHN37ZK752XSXHEENCCR/bundle.json","state":"https://pith.science/pith/NS5R5BBHN37ZK752XSXHEENCCR/state.json","well_known_bundle":"https://pith.science/.well-known/pith/NS5R5BBHN37ZK752XSXHEENCCR/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:NS5R5BBHN37ZK752XSXHEENCCR","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":"5e7dec96c164aa81e5b726c8b2154d485ae056c9be180eedc35508ebcffff3dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-07-28T20:00:05Z","title_canon_sha256":"d09bac6242170855dda6f8bf02df6d0b796bf5174c324fea2d3130633c406bca"},"schema_version":"1.0","source":{"id":"0907.4982","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0907.4982","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"arxiv_version","alias_value":"0907.4982v1","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0907.4982","created_at":"2026-05-18T02:12:46Z"},{"alias_kind":"pith_short_12","alias_value":"NS5R5BBHN37Z","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_16","alias_value":"NS5R5BBHN37ZK752","created_at":"2026-05-18T12:26:00Z"},{"alias_kind":"pith_short_8","alias_value":"NS5R5BBH","created_at":"2026-05-18T12:26:00Z"}],"graph_snapshots":[{"event_id":"sha256:07ad4f004520e16a1021078aa4af4bc9d0b7ce7d228599baf28644e45108e8c3","target":"graph","created_at":"2026-05-18T02:12:46Z","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":"A recent survey of the Local Group spiral galaxy M 31 with XMM-Newton yielded a large number of X-ray sources. This is the second in a series of papers with the aim of identifying the optical counterparts of these X-ray sources. We have obtained optical spectra for 21 bright optical counterparts of 20 X-ray sources in the direction of M 31, using the 1.3-m Skinakas telescope in Crete, Greece. For 17 of the 20 X-ray sources, we have identified the optical counterpart as a normal late type star (of type F or later) in the foreground (i.e. in the Milky Way). For two more sources there were two po","authors_text":"1) ((1) University of Crete, 2), (2) IESL, (3) Max-Planck-Institut fur extraterrestrische Physik), Despina Hatzidimitriou (1, Foundation for Research, Paolo Bonfini (1), Physics Department, P. Reig (2, Technology, Wolfgang Pietsch (3)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-07-28T20:00:05Z","title":"Spectroscopy of the bright optical counterparts of X-ray sources in the direction of M 31. II"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0907.4982","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:c8e40dcd1d8641774b80b04805f5ed198d7e097f06081f70e2adead2621230f5","target":"record","created_at":"2026-05-18T02:12:46Z","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":"5e7dec96c164aa81e5b726c8b2154d485ae056c9be180eedc35508ebcffff3dd","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2009-07-28T20:00:05Z","title_canon_sha256":"d09bac6242170855dda6f8bf02df6d0b796bf5174c324fea2d3130633c406bca"},"schema_version":"1.0","source":{"id":"0907.4982","kind":"arxiv","version":1}},"canonical_sha256":"6cbb1e84276eff957fbabcae7211a214791c8ab84279c961d1eb50057ea7110b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"6cbb1e84276eff957fbabcae7211a214791c8ab84279c961d1eb50057ea7110b","first_computed_at":"2026-05-18T02:12:46.941821Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:12:46.941821Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oQXTtOOZJJWqQY6rQOIEFrpKC3wMmn7YJ7IUZCuU47I3VjG69c2ohSvUOnAFMpxOsyrJz+L3ttNDBLFHO0PoAQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:12:46.942557Z","signed_message":"canonical_sha256_bytes"},"source_id":"0907.4982","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c8e40dcd1d8641774b80b04805f5ed198d7e097f06081f70e2adead2621230f5","sha256:07ad4f004520e16a1021078aa4af4bc9d0b7ce7d228599baf28644e45108e8c3"],"state_sha256":"39868f8fddb57769485b7729ef1c0f31db874ceeca865fbc4d64b1ef01a6082e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"VkzW6E3RJgkHhFfKuA4a1bRlK+aDFID5opJaS/Yvc/+jKSVQBcR5Bbe297HPAAIPiC3/mVxYNFAV+BGKH1WmBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-30T07:05:47.115721Z","bundle_sha256":"3385dec7ae953fba4537685b6ff4b9d42d65257db0e7fed638b5342cd5431435"}}