{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:JM4ANAXIK45UEWQI5SXG44DP55","short_pith_number":"pith:JM4ANAXI","canonical_record":{"source":{"id":"1002.0691","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-03T10:09:45Z","cross_cats_sorted":[],"title_canon_sha256":"fb915b5f57bc6a634c980fe75b9a8176f8ccd79f06f50e603eb8b1498608d68f","abstract_canon_sha256":"9b6ed313e20314b9cd1d583d4107554ce805e7e73934fa381f527da98d3949d5"},"schema_version":"1.0"},"canonical_sha256":"4b380682e8573b425a08ecae6e706fef68077711fb3ad5900ef581a7f948ef4b","source":{"kind":"arxiv","id":"1002.0691","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.0691","created_at":"2026-05-18T02:09:20Z"},{"alias_kind":"arxiv_version","alias_value":"1002.0691v1","created_at":"2026-05-18T02:09:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.0691","created_at":"2026-05-18T02:09:20Z"},{"alias_kind":"pith_short_12","alias_value":"JM4ANAXIK45U","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"JM4ANAXIK45UEWQI","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"JM4ANAXI","created_at":"2026-05-18T12:26:09Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:JM4ANAXIK45UEWQI5SXG44DP55","target":"record","payload":{"canonical_record":{"source":{"id":"1002.0691","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-03T10:09:45Z","cross_cats_sorted":[],"title_canon_sha256":"fb915b5f57bc6a634c980fe75b9a8176f8ccd79f06f50e603eb8b1498608d68f","abstract_canon_sha256":"9b6ed313e20314b9cd1d583d4107554ce805e7e73934fa381f527da98d3949d5"},"schema_version":"1.0"},"canonical_sha256":"4b380682e8573b425a08ecae6e706fef68077711fb3ad5900ef581a7f948ef4b","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:09:20.476352Z","signature_b64":"osS+u9h1Cpm1trAWXHd3xBZqGfNJI5i3cydCQoeRdTjdWpsFo7F+1foBIn1wacvqyrVTZpyQgu+6s+bXiRQRDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"4b380682e8573b425a08ecae6e706fef68077711fb3ad5900ef581a7f948ef4b","last_reissued_at":"2026-05-18T02:09:20.475533Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:09:20.475533Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.0691","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":"2026-05-18T02:09:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"w4/l8jjq1GvtKnd/zHPX31FVg7BxpNx4i55idbk56OFdrRmSGP04K6mTVEo3hVgb8nlja+SFJ8mWkIV8zd+EAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:12:21.682331Z"},"content_sha256":"09446b6e04456b00582b8d481466159f8cf95a39a188e746fb0d613ace35f838","schema_version":"1.0","event_id":"sha256:09446b6e04456b00582b8d481466159f8cf95a39a188e746fb0d613ace35f838"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:JM4ANAXIK45UEWQI5SXG44DP55","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Deep GMRT 150 MHz observations of the LBDS-Lynx region: Ultra-Steep Spectrum Radio Sources","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.CO","authors_text":"2), (2) Inter-University Centre for Astronomy, (3) International Centre for Radio Astronomical Research, (4) School of Earth, Arizona State University USA), Astrophysics, C. H. Ishwara-Chandra (1, India, Pune, R. Windhorst (4) ((1) National Centre for Radio Astrophysics-TATA Institute of Fundamental Research, S. K. Sirothia (1), Space Exploration, S. Pal (3), University of Western Australia, Y. Wadadekar (1)","submitted_at":"2010-02-03T10:09:45Z","abstract_excerpt":"It has been known for nearly three decades that high redshift radio galaxies exhibit steep radio spectra, and hence ultra-steep spectrum radio sources provide candidates for high-redshift radio galaxies. Nearly all radio galaxies with z > 3 have been found using this redshift-spectral index correlation. We have started a programme with GMRT to exploit this correlation at flux density levels about 10 to 100 times deeper than the known high-redshift radio galaxies which were identified primarily using the already available radio catalogues. In our programme, we have obtained deep, high resolutio"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.0691","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":"2026-05-18T02:09:20Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"F1Fzwyan/1VjHzscx2vNBQpX74oxD11tBeEPwlmwDQatG7dn4tvhLCl3Te4L53mNIRNmOcpzrqGri9IWEV1OCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T19:12:21.682791Z"},"content_sha256":"cc1f014bbf1c318c7c6f9fc2df128a038aac9c70855688268d7ba17303db9658","schema_version":"1.0","event_id":"sha256:cc1f014bbf1c318c7c6f9fc2df128a038aac9c70855688268d7ba17303db9658"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/JM4ANAXIK45UEWQI5SXG44DP55/bundle.json","state_url":"https://pith.science/pith/JM4ANAXIK45UEWQI5SXG44DP55/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/JM4ANAXIK45UEWQI5SXG44DP55/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":"2026-05-26T19:12:21Z","links":{"resolver":"https://pith.science/pith/JM4ANAXIK45UEWQI5SXG44DP55","bundle":"https://pith.science/pith/JM4ANAXIK45UEWQI5SXG44DP55/bundle.json","state":"https://pith.science/pith/JM4ANAXIK45UEWQI5SXG44DP55/state.json","well_known_bundle":"https://pith.science/.well-known/pith/JM4ANAXIK45UEWQI5SXG44DP55/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:JM4ANAXIK45UEWQI5SXG44DP55","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":"9b6ed313e20314b9cd1d583d4107554ce805e7e73934fa381f527da98d3949d5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-03T10:09:45Z","title_canon_sha256":"fb915b5f57bc6a634c980fe75b9a8176f8ccd79f06f50e603eb8b1498608d68f"},"schema_version":"1.0","source":{"id":"1002.0691","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.0691","created_at":"2026-05-18T02:09:20Z"},{"alias_kind":"arxiv_version","alias_value":"1002.0691v1","created_at":"2026-05-18T02:09:20Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.0691","created_at":"2026-05-18T02:09:20Z"},{"alias_kind":"pith_short_12","alias_value":"JM4ANAXIK45U","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_16","alias_value":"JM4ANAXIK45UEWQI","created_at":"2026-05-18T12:26:09Z"},{"alias_kind":"pith_short_8","alias_value":"JM4ANAXI","created_at":"2026-05-18T12:26:09Z"}],"graph_snapshots":[{"event_id":"sha256:cc1f014bbf1c318c7c6f9fc2df128a038aac9c70855688268d7ba17303db9658","target":"graph","created_at":"2026-05-18T02:09:20Z","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":"It has been known for nearly three decades that high redshift radio galaxies exhibit steep radio spectra, and hence ultra-steep spectrum radio sources provide candidates for high-redshift radio galaxies. Nearly all radio galaxies with z > 3 have been found using this redshift-spectral index correlation. We have started a programme with GMRT to exploit this correlation at flux density levels about 10 to 100 times deeper than the known high-redshift radio galaxies which were identified primarily using the already available radio catalogues. In our programme, we have obtained deep, high resolutio","authors_text":"2), (2) Inter-University Centre for Astronomy, (3) International Centre for Radio Astronomical Research, (4) School of Earth, Arizona State University USA), Astrophysics, C. H. Ishwara-Chandra (1, India, Pune, R. Windhorst (4) ((1) National Centre for Radio Astrophysics-TATA Institute of Fundamental Research, S. K. Sirothia (1), Space Exploration, S. Pal (3), University of Western Australia, Y. Wadadekar (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-03T10:09:45Z","title":"Deep GMRT 150 MHz observations of the LBDS-Lynx region: Ultra-Steep Spectrum Radio Sources"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.0691","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":"sha256:09446b6e04456b00582b8d481466159f8cf95a39a188e746fb0d613ace35f838","target":"record","created_at":"2026-05-18T02:09:20Z","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":"9b6ed313e20314b9cd1d583d4107554ce805e7e73934fa381f527da98d3949d5","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.CO","submitted_at":"2010-02-03T10:09:45Z","title_canon_sha256":"fb915b5f57bc6a634c980fe75b9a8176f8ccd79f06f50e603eb8b1498608d68f"},"schema_version":"1.0","source":{"id":"1002.0691","kind":"arxiv","version":1}},"canonical_sha256":"4b380682e8573b425a08ecae6e706fef68077711fb3ad5900ef581a7f948ef4b","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"4b380682e8573b425a08ecae6e706fef68077711fb3ad5900ef581a7f948ef4b","first_computed_at":"2026-05-18T02:09:20.475533Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:20.475533Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"osS+u9h1Cpm1trAWXHd3xBZqGfNJI5i3cydCQoeRdTjdWpsFo7F+1foBIn1wacvqyrVTZpyQgu+6s+bXiRQRDg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:20.476352Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.0691","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:09446b6e04456b00582b8d481466159f8cf95a39a188e746fb0d613ace35f838","sha256:cc1f014bbf1c318c7c6f9fc2df128a038aac9c70855688268d7ba17303db9658"],"state_sha256":"310fe8da62607421dc6c3a5acc9a2a56cc1fd160bc21dbe02d8d13925aa72386"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Yn5jAQa8sIrILI05bcNsjM9/lGt1leHmIGPcaJzq9Dy7w1ezqbhfFR0/q9qSThHL21oBDT/+TOJamxP38wjrDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T19:12:21.686589Z","bundle_sha256":"763a560b9dc9f67c36ce53ddeef475241285fdbb0f1a49f3c0546311d4a7037a"}}