{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2011:XPMKWARHEYLGQKHQ2E6LNKDILF","short_pith_number":"pith:XPMKWARH","schema_version":"1.0","canonical_sha256":"bbd8ab022726166828f0d13cb6a86859708e11b4fd4643d5a4dbe99fb45c1900","source":{"kind":"arxiv","id":"1106.1745","version":2},"attestation_state":"computed","paper":{"title":"Probing cosmic star formation up to z = 9.4 with GRBs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.CO","authors_text":"Andrea Ferrara, Emille E. O. Ishida, Rafael S. de Souza","submitted_at":"2011-06-09T08:53:13Z","abstract_excerpt":"We propose a novel approach, based on Principal Components Analysis, to the use of Gamma-Ray Bursts (GRBs) as probes of cosmic star formation history (SFH) up to very high redshifts. The main advantage of such approach is to avoid the necessity of assuming an \\textit{ad hoc} parameterization of the SFH. We first validate the method by reconstructing a known SFH from Monte Carlo-generated mock data. We then apply the method to the most recent \\textit{Swift} data of GRBs with known redshift and compare it against the SFH obtained by independent methods. The main conclusion is that the level of s"},"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":"1106.1745","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2011-06-09T08:53:13Z","cross_cats_sorted":["astro-ph.IM"],"title_canon_sha256":"e35af69595809d6c7ddbece18825694bab2a818f9d0f9055488dfebfef66aac3","abstract_canon_sha256":"5397cc6bd6d45dc0e11a44200e585a60e28351c726018e1324e8985d12667564"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T03:55:35.649165Z","signature_b64":"SlW5ot3HMnkXpZje6n+Gtkh+vLG3+dVgOt+DFSZnA95Nt/1pSkpE0CcgSe/Dv85gr+6J7D6t/q4tveKjOV44DQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbd8ab022726166828f0d13cb6a86859708e11b4fd4643d5a4dbe99fb45c1900","last_reissued_at":"2026-05-18T03:55:35.648348Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T03:55:35.648348Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Probing cosmic star formation up to z = 9.4 with GRBs","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.IM"],"primary_cat":"astro-ph.CO","authors_text":"Andrea Ferrara, Emille E. O. Ishida, Rafael S. de Souza","submitted_at":"2011-06-09T08:53:13Z","abstract_excerpt":"We propose a novel approach, based on Principal Components Analysis, to the use of Gamma-Ray Bursts (GRBs) as probes of cosmic star formation history (SFH) up to very high redshifts. The main advantage of such approach is to avoid the necessity of assuming an \\textit{ad hoc} parameterization of the SFH. We first validate the method by reconstructing a known SFH from Monte Carlo-generated mock data. We then apply the method to the most recent \\textit{Swift} data of GRBs with known redshift and compare it against the SFH obtained by independent methods. The main conclusion is that the level of s"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1106.1745","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"},"aliases":[{"alias_kind":"arxiv","alias_value":"1106.1745","created_at":"2026-05-18T03:55:35.648483+00:00"},{"alias_kind":"arxiv_version","alias_value":"1106.1745v2","created_at":"2026-05-18T03:55:35.648483+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1106.1745","created_at":"2026-05-18T03:55:35.648483+00:00"},{"alias_kind":"pith_short_12","alias_value":"XPMKWARHEYLG","created_at":"2026-05-18T12:26:47.523578+00:00"},{"alias_kind":"pith_short_16","alias_value":"XPMKWARHEYLGQKHQ","created_at":"2026-05-18T12:26:47.523578+00:00"},{"alias_kind":"pith_short_8","alias_value":"XPMKWARH","created_at":"2026-05-18T12:26:47.523578+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/XPMKWARHEYLGQKHQ2E6LNKDILF","json":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF.json","graph_json":"https://pith.science/api/pith-number/XPMKWARHEYLGQKHQ2E6LNKDILF/graph.json","events_json":"https://pith.science/api/pith-number/XPMKWARHEYLGQKHQ2E6LNKDILF/events.json","paper":"https://pith.science/paper/XPMKWARH"},"agent_actions":{"view_html":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF","download_json":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF.json","view_paper":"https://pith.science/paper/XPMKWARH","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=1106.1745&json=true","fetch_graph":"https://pith.science/api/pith-number/XPMKWARHEYLGQKHQ2E6LNKDILF/graph.json","fetch_events":"https://pith.science/api/pith-number/XPMKWARHEYLGQKHQ2E6LNKDILF/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF/action/storage_attestation","attest_author":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF/action/author_attestation","sign_citation":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF/action/citation_signature","submit_replication":"https://pith.science/pith/XPMKWARHEYLGQKHQ2E6LNKDILF/action/replication_record"}},"created_at":"2026-05-18T03:55:35.648483+00:00","updated_at":"2026-05-18T03:55:35.648483+00:00"}