{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2006:IAL2KQSHH55HOCKBRCU257L4PJ","short_pith_number":"pith:IAL2KQSH","canonical_record":{"source":{"id":"astro-ph/0609489","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-18T15:37:52Z","cross_cats_sorted":[],"title_canon_sha256":"fc39c795fd85994b618e75b827d2c5cdfa1ac24d2c917656abf58782fa9420a4","abstract_canon_sha256":"ddf385e05ae642bd0a0a3617d170f4ecea7a7259ba94febb551277babbd5874b"},"schema_version":"1.0"},"canonical_sha256":"4017a542473f7a77094188a9aefd7c7a54173d62f2c7ef796560a7a410a0759d","source":{"kind":"arxiv","id":"astro-ph/0609489","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0609489","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0609489v1","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0609489","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"pith_short_12","alias_value":"IAL2KQSHH55H","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"pith_short_16","alias_value":"IAL2KQSHH55HOCKB","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"pith_short_8","alias_value":"IAL2KQSH","created_at":"2026-07-04T16:59:25Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2006:IAL2KQSHH55HOCKBRCU257L4PJ","target":"record","payload":{"canonical_record":{"source":{"id":"astro-ph/0609489","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-18T15:37:52Z","cross_cats_sorted":[],"title_canon_sha256":"fc39c795fd85994b618e75b827d2c5cdfa1ac24d2c917656abf58782fa9420a4","abstract_canon_sha256":"ddf385e05ae642bd0a0a3617d170f4ecea7a7259ba94febb551277babbd5874b"},"schema_version":"1.0"},"canonical_sha256":"4017a542473f7a77094188a9aefd7c7a54173d62f2c7ef796560a7a410a0759d","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:59:25.178757Z","signature_b64":"TMg4rKlcnL+LCOhPqex4Ggt7x3q85HF/a5XjANxEqM9GIyIRSiuzu/6y+7/AalkEZ/pOisFLk9U7Qgcb/crhAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4017a542473f7a77094188a9aefd7c7a54173d62f2c7ef796560a7a410a0759d","last_reissued_at":"2026-07-04T16:59:25.178422Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:59:25.178422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"astro-ph/0609489","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":"2026-07-04T16:59:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ovDRkFZk286fZeif8bxJm4Ko70iDOuaK6daTQ1zlukvSC27Q6j+gKRwe89pu7rj0kIVSrKO8/IW34t9inz8QAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T04:32:02.772820Z"},"content_sha256":"b415289392950d74d083a5f501859e41aeda5cea881cfcc4bc1c60b5f4f68e0d","schema_version":"1.0","event_id":"sha256:b415289392950d74d083a5f501859e41aeda5cea881cfcc4bc1c60b5f4f68e0d"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2006:IAL2KQSHH55HOCKBRCU257L4PJ","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"GRBs as Cosmological Probes - Cosmic Chemical Evolution","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"S. Savaglio (MPE)","submitted_at":"2006-09-18T15:37:52Z","abstract_excerpt":"Long-duration gamma-ray bursts (GRBs) are associated with the death of metal-poor massive stars. Even though they are highly transient events very hard to localize, they are so bright that they can be detected in the most difficult environments. GRB observations are unveiling a surprising view of the chemical state of the distant universe (redshifts z > 2). Contrary to what is expected for a high-z metal-poor star, the neutral interstellar medium (ISM) around GRBs is not metal poor (metallicities vary from ~1/10 solar at z = 6.3 to about solar at z = 2) and is enriched with dust (90-99% of iro"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0609489","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/astro-ph/0609489/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"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T16:59:25Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JFvYCsM74qwaBqKFV1z0bXtXA2VREdQ2SDXdkm3yFF4EMIOa2S7Cv+iYFyLpUDuGsJoV8UN46VOAXefMCB85Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-18T04:32:02.773701Z"},"content_sha256":"5193f70d5554cdfd87e41a6e42fb8fced2c173ffe7b39ac8fc36e675c183eb14","schema_version":"1.0","event_id":"sha256:5193f70d5554cdfd87e41a6e42fb8fced2c173ffe7b39ac8fc36e675c183eb14"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/IAL2KQSHH55HOCKBRCU257L4PJ/bundle.json","state_url":"https://pith.science/pith/IAL2KQSHH55HOCKBRCU257L4PJ/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/IAL2KQSHH55HOCKBRCU257L4PJ/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":"2026-08-18T04:32:02Z","links":{"resolver":"https://pith.science/pith/IAL2KQSHH55HOCKBRCU257L4PJ","bundle":"https://pith.science/pith/IAL2KQSHH55HOCKBRCU257L4PJ/bundle.json","state":"https://pith.science/pith/IAL2KQSHH55HOCKBRCU257L4PJ/state.json","well_known_bundle":"https://pith.science/.well-known/pith/IAL2KQSHH55HOCKBRCU257L4PJ/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2006:IAL2KQSHH55HOCKBRCU257L4PJ","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":"ddf385e05ae642bd0a0a3617d170f4ecea7a7259ba94febb551277babbd5874b","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-18T15:37:52Z","title_canon_sha256":"fc39c795fd85994b618e75b827d2c5cdfa1ac24d2c917656abf58782fa9420a4"},"schema_version":"1.0","source":{"id":"astro-ph/0609489","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0609489","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0609489v1","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0609489","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"pith_short_12","alias_value":"IAL2KQSHH55H","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"pith_short_16","alias_value":"IAL2KQSHH55HOCKB","created_at":"2026-07-04T16:59:25Z"},{"alias_kind":"pith_short_8","alias_value":"IAL2KQSH","created_at":"2026-07-04T16:59:25Z"}],"graph_snapshots":[{"event_id":"sha256:5193f70d5554cdfd87e41a6e42fb8fced2c173ffe7b39ac8fc36e675c183eb14","target":"graph","created_at":"2026-07-04T16:59:25Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/astro-ph/0609489/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Long-duration gamma-ray bursts (GRBs) are associated with the death of metal-poor massive stars. Even though they are highly transient events very hard to localize, they are so bright that they can be detected in the most difficult environments. GRB observations are unveiling a surprising view of the chemical state of the distant universe (redshifts z > 2). Contrary to what is expected for a high-z metal-poor star, the neutral interstellar medium (ISM) around GRBs is not metal poor (metallicities vary from ~1/10 solar at z = 6.3 to about solar at z = 2) and is enriched with dust (90-99% of iro","authors_text":"S. Savaglio (MPE)","cross_cats":[],"headline":"","license":"","primary_cat":"astro-ph","submitted_at":"2006-09-18T15:37:52Z","title":"GRBs as Cosmological Probes - Cosmic Chemical Evolution"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0609489","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:b415289392950d74d083a5f501859e41aeda5cea881cfcc4bc1c60b5f4f68e0d","target":"record","created_at":"2026-07-04T16:59:25Z","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":"ddf385e05ae642bd0a0a3617d170f4ecea7a7259ba94febb551277babbd5874b","cross_cats_sorted":[],"license":"","primary_cat":"astro-ph","submitted_at":"2006-09-18T15:37:52Z","title_canon_sha256":"fc39c795fd85994b618e75b827d2c5cdfa1ac24d2c917656abf58782fa9420a4"},"schema_version":"1.0","source":{"id":"astro-ph/0609489","kind":"arxiv","version":1}},"canonical_sha256":"4017a542473f7a77094188a9aefd7c7a54173d62f2c7ef796560a7a410a0759d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4017a542473f7a77094188a9aefd7c7a54173d62f2c7ef796560a7a410a0759d","first_computed_at":"2026-07-04T16:59:25.178422Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T16:59:25.178422Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TMg4rKlcnL+LCOhPqex4Ggt7x3q85HF/a5XjANxEqM9GIyIRSiuzu/6y+7/AalkEZ/pOisFLk9U7Qgcb/crhAA==","signature_status":"signed_v1","signed_at":"2026-07-04T16:59:25.178757Z","signed_message":"canonical_sha256_bytes"},"source_id":"astro-ph/0609489","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b415289392950d74d083a5f501859e41aeda5cea881cfcc4bc1c60b5f4f68e0d","sha256:5193f70d5554cdfd87e41a6e42fb8fced2c173ffe7b39ac8fc36e675c183eb14"],"state_sha256":"5b17352ee9124b2f5f80f31bfccf13a9b491fff3804ea5e7bcadb6e282115103"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BTaGYpJeaD8TGRsGCfV6p3iKHUs0Fk0gHqx1Tg9dOvcBiqBZV9Hk01MYPBlmL6wX+9RAbqzqN7dkp9roOvvxCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-18T04:32:02.779009Z","bundle_sha256":"18e6d09dbcda1d6b955dce606d39729e815675468a004f5a74790cefd6ea23ec"}}