{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:ZVWUX7BLOJ7326FIL4HXDOXF3Q","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":"51875a9b379a7424ceb8fff385b63ec803cfc2cf8aea4c2c139c516e2bbc3f71","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-15T11:14:08Z","title_canon_sha256":"00fd95709b8232f2a3047d7eb6e3f43236a4b5a8062f35f1d96bff22e7912c8c"},"schema_version":"1.0","source":{"id":"1311.3809","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.3809","created_at":"2026-05-18T02:52:32Z"},{"alias_kind":"arxiv_version","alias_value":"1311.3809v2","created_at":"2026-05-18T02:52:32Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.3809","created_at":"2026-05-18T02:52:32Z"},{"alias_kind":"pith_short_12","alias_value":"ZVWUX7BLOJ73","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_16","alias_value":"ZVWUX7BLOJ7326FI","created_at":"2026-05-18T12:28:09Z"},{"alias_kind":"pith_short_8","alias_value":"ZVWUX7BL","created_at":"2026-05-18T12:28:09Z"}],"graph_snapshots":[{"event_id":"sha256:6cff2ff3d331957a51274cb46461be15ab60229de814d88e5e0ea0d4c789dbf4","target":"graph","created_at":"2026-05-18T02:52:32Z","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":"Context. The study of BL Lac objects (BLL) detected in gamma-rays gives insights on the acceleration mechanisms in play in such systems and is also a valuable tool to constrain the density of the extragalactic background light. As their spectra are dominated by the non-thermal emission of the jet and the spectral features are weak and narrow in the optical domain, measuring their redshift is challenging. However such a measure is fundamental as it allows a firm determination of the distance and luminosity of the source, and therefore a consistent model of its emission. Aims. Measurement of the","authors_text":"Catherine Boisson, Fran\\c{c}ois Hammer, H\\'el\\`ene Sol, Jean-Philippe Lenain, Lex Kaper, Lucie G\\'erard, Michael Punch, Paolo Goldoni, Santiago Pita","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-15T11:14:08Z","title":"Spectroscopy of High Energy BL Lac Objects with X-shooter on the VLT"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.3809","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:a66c1a9f5380df0c0060c393633ee99056f3ee23fded833d84c71565d4bd0b03","target":"record","created_at":"2026-05-18T02:52:32Z","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":"51875a9b379a7424ceb8fff385b63ec803cfc2cf8aea4c2c139c516e2bbc3f71","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-15T11:14:08Z","title_canon_sha256":"00fd95709b8232f2a3047d7eb6e3f43236a4b5a8062f35f1d96bff22e7912c8c"},"schema_version":"1.0","source":{"id":"1311.3809","kind":"arxiv","version":2}},"canonical_sha256":"cd6d4bfc2b727fbd78a85f0f71bae5dc376922d2c1bbedb3c13c7182a9eaf814","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"cd6d4bfc2b727fbd78a85f0f71bae5dc376922d2c1bbedb3c13c7182a9eaf814","first_computed_at":"2026-05-18T02:52:32.114899Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:52:32.114899Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"KWPuI8zvfGSe4ZAIB4o6h+rfQVYCD35+4yyv9f6ZnWJisooPK/cOX3mTqvW3+rkeHI6E8jjvzl0iQZ5uQWBvAA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:52:32.115485Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.3809","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a66c1a9f5380df0c0060c393633ee99056f3ee23fded833d84c71565d4bd0b03","sha256:6cff2ff3d331957a51274cb46461be15ab60229de814d88e5e0ea0d4c789dbf4"],"state_sha256":"0d7cea4e5645a537314bf65e06a2c7c2eb7d7b14ff99de9318f6e0a2f93e50cc"}