{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:GSZN3GJ2E6RTAGHL2H6I5BFFRI","short_pith_number":"pith:GSZN3GJ2","canonical_record":{"source":{"id":"1303.0844","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-03-04T21:00:35Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"f23f8bcce7bfbc38fd6630b674bd4909c54f1484eddc635079e754ab76c0e7fc","abstract_canon_sha256":"5cfc833f9e6c60ff26011374895a255ad0c80511b52b46508b11e160c29b2ab2"},"schema_version":"1.0"},"canonical_sha256":"34b2dd993a27a33018ebd1fc8e84a58a08bca00580f0657c5d3ae9989ffb1ef8","source":{"kind":"arxiv","id":"1303.0844","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.0844","created_at":"2026-05-18T01:51:17Z"},{"alias_kind":"arxiv_version","alias_value":"1303.0844v1","created_at":"2026-05-18T01:51:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.0844","created_at":"2026-05-18T01:51:17Z"},{"alias_kind":"pith_short_12","alias_value":"GSZN3GJ2E6RT","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GSZN3GJ2E6RTAGHL","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GSZN3GJ2","created_at":"2026-05-18T12:27:45Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:GSZN3GJ2E6RTAGHL2H6I5BFFRI","target":"record","payload":{"canonical_record":{"source":{"id":"1303.0844","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-03-04T21:00:35Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"f23f8bcce7bfbc38fd6630b674bd4909c54f1484eddc635079e754ab76c0e7fc","abstract_canon_sha256":"5cfc833f9e6c60ff26011374895a255ad0c80511b52b46508b11e160c29b2ab2"},"schema_version":"1.0"},"canonical_sha256":"34b2dd993a27a33018ebd1fc8e84a58a08bca00580f0657c5d3ae9989ffb1ef8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:51:17.166443Z","signature_b64":"VMksF2dYBx9SCo0Ycb359vk2mULbWgVj86dbKj/pXug68d683PSb574EEzZZm7ntliiDFy/S/VknOWfvi4iYAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"34b2dd993a27a33018ebd1fc8e84a58a08bca00580f0657c5d3ae9989ffb1ef8","last_reissued_at":"2026-05-18T01:51:17.165642Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:51:17.165642Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1303.0844","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":"2026-05-18T01:51:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"yUWWPGRXDsm9dLsGyWHiPEuLW3mAOssV98dbuew//+FAu4/51p1v7Zav1dVYpgzAGhIuBTuNAU17+M5k8xnOCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T21:44:36.450492Z"},"content_sha256":"112e73bb5321313ba8f604296e848c775b318c656e809a2fe8ab1f57a6db0d79","schema_version":"1.0","event_id":"sha256:112e73bb5321313ba8f604296e848c775b318c656e809a2fe8ab1f57a6db0d79"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:GSZN3GJ2E6RTAGHL2H6I5BFFRI","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"X-ray absorption evolution in Gamma-Ray Bursts: intergalactic medium or evolutionary signature of their host galaxies?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A.E. Scott, A.J. Levan, G.C. Stewart, K. Wiersema, N.R. Tanvir, P.T. O'Brien, R.L.C. Starling, R. Willingale","submitted_at":"2013-03-04T21:00:35Z","abstract_excerpt":"The intrinsic X-ray emission of Gamma-Ray Bursts (GRBs) is often found to be absorbed over and above the column density through our own galaxy. The extra component is usually assumed to be due to absorbing gas lying within the host galaxy of the GRB itself. There is an apparent correlation between the equivalent column density of hydrogen, N(H,intrinsic) (assuming it to be at the GRB redshift), and redshift, z, with the few z>6 GRBs showing the greatest intrinsic column densities. We investigate the N(H,intrinsic) - z relation using a large sample of Swift GRBs, as well as active galactic nucl"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.0844","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":"2026-05-18T01:51:17Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1J9UEpVtaJHS+fziJk9nkjkIltEOdmwNvZblj9Na/ax3bLt8osrAlfOu/Xbker/Mh+TGSUuWGnnDEfGxhWFbAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-06T21:44:36.451080Z"},"content_sha256":"24b09b092f61bf8c8830011ceb947279f74dd302ee03bca64cfcffb33cace3dd","schema_version":"1.0","event_id":"sha256:24b09b092f61bf8c8830011ceb947279f74dd302ee03bca64cfcffb33cace3dd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI/bundle.json","state_url":"https://pith.science/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI/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":"2026-06-06T21:44:36Z","links":{"resolver":"https://pith.science/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI","bundle":"https://pith.science/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI/bundle.json","state":"https://pith.science/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI/state.json","well_known_bundle":"https://pith.science/.well-known/pith/GSZN3GJ2E6RTAGHL2H6I5BFFRI/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:GSZN3GJ2E6RTAGHL2H6I5BFFRI","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":"5cfc833f9e6c60ff26011374895a255ad0c80511b52b46508b11e160c29b2ab2","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-03-04T21:00:35Z","title_canon_sha256":"f23f8bcce7bfbc38fd6630b674bd4909c54f1484eddc635079e754ab76c0e7fc"},"schema_version":"1.0","source":{"id":"1303.0844","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1303.0844","created_at":"2026-05-18T01:51:17Z"},{"alias_kind":"arxiv_version","alias_value":"1303.0844v1","created_at":"2026-05-18T01:51:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1303.0844","created_at":"2026-05-18T01:51:17Z"},{"alias_kind":"pith_short_12","alias_value":"GSZN3GJ2E6RT","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_16","alias_value":"GSZN3GJ2E6RTAGHL","created_at":"2026-05-18T12:27:45Z"},{"alias_kind":"pith_short_8","alias_value":"GSZN3GJ2","created_at":"2026-05-18T12:27:45Z"}],"graph_snapshots":[{"event_id":"sha256:24b09b092f61bf8c8830011ceb947279f74dd302ee03bca64cfcffb33cace3dd","target":"graph","created_at":"2026-05-18T01:51:17Z","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":"The intrinsic X-ray emission of Gamma-Ray Bursts (GRBs) is often found to be absorbed over and above the column density through our own galaxy. The extra component is usually assumed to be due to absorbing gas lying within the host galaxy of the GRB itself. There is an apparent correlation between the equivalent column density of hydrogen, N(H,intrinsic) (assuming it to be at the GRB redshift), and redshift, z, with the few z>6 GRBs showing the greatest intrinsic column densities. We investigate the N(H,intrinsic) - z relation using a large sample of Swift GRBs, as well as active galactic nucl","authors_text":"A.E. Scott, A.J. Levan, G.C. Stewart, K. Wiersema, N.R. Tanvir, P.T. O'Brien, R.L.C. Starling, R. Willingale","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-03-04T21:00:35Z","title":"X-ray absorption evolution in Gamma-Ray Bursts: intergalactic medium or evolutionary signature of their host galaxies?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1303.0844","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":"sha256:112e73bb5321313ba8f604296e848c775b318c656e809a2fe8ab1f57a6db0d79","target":"record","created_at":"2026-05-18T01:51:17Z","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":"5cfc833f9e6c60ff26011374895a255ad0c80511b52b46508b11e160c29b2ab2","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-03-04T21:00:35Z","title_canon_sha256":"f23f8bcce7bfbc38fd6630b674bd4909c54f1484eddc635079e754ab76c0e7fc"},"schema_version":"1.0","source":{"id":"1303.0844","kind":"arxiv","version":1}},"canonical_sha256":"34b2dd993a27a33018ebd1fc8e84a58a08bca00580f0657c5d3ae9989ffb1ef8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"34b2dd993a27a33018ebd1fc8e84a58a08bca00580f0657c5d3ae9989ffb1ef8","first_computed_at":"2026-05-18T01:51:17.165642Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:51:17.165642Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"VMksF2dYBx9SCo0Ycb359vk2mULbWgVj86dbKj/pXug68d683PSb574EEzZZm7ntliiDFy/S/VknOWfvi4iYAw==","signature_status":"signed_v1","signed_at":"2026-05-18T01:51:17.166443Z","signed_message":"canonical_sha256_bytes"},"source_id":"1303.0844","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:112e73bb5321313ba8f604296e848c775b318c656e809a2fe8ab1f57a6db0d79","sha256:24b09b092f61bf8c8830011ceb947279f74dd302ee03bca64cfcffb33cace3dd"],"state_sha256":"8c5510c1768e94626571ee515733a8c4275c2f4ab1d40d134d5f8dfd7ea0a122"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"EQn+VyghIX+FLRf27wA7AvTly4OJhsgIWL9Yd/JP7UOnDRRbGGbI2+BoIZTFmVRbecB73DxbiKLmh2kxFYK3Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-06T21:44:36.454275Z","bundle_sha256":"bc98fd495afda96cc5520d395b638f6549f4746c4f7ff18a9f8c62800ec61510"}}