{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2009:4EUEG536CJKZT2N7ANUYGFWVTV","short_pith_number":"pith:4EUEG536","canonical_record":{"source":{"id":"0905.0906","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-05-06T20:03:04Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"b844df5b6542aa3c73b1513de706f4d23648a56b704824e8edb7c6a7efe2224f","abstract_canon_sha256":"bbbd23789ee31e2f0238372ece4ad1220ec86b764ce5927d1b0d7471a81ce25b"},"schema_version":"1.0"},"canonical_sha256":"e12843777e125599e9bf03698316d59d78d44319d5d3ff36be03bb78d249855f","source":{"kind":"arxiv","id":"0905.0906","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.0906","created_at":"2026-05-18T02:13:46Z"},{"alias_kind":"arxiv_version","alias_value":"0905.0906v1","created_at":"2026-05-18T02:13:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.0906","created_at":"2026-05-18T02:13:46Z"},{"alias_kind":"pith_short_12","alias_value":"4EUEG536CJKZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4EUEG536CJKZT2N7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4EUEG536","created_at":"2026-05-18T12:25:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2009:4EUEG536CJKZT2N7ANUYGFWVTV","target":"record","payload":{"canonical_record":{"source":{"id":"0905.0906","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-05-06T20:03:04Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"b844df5b6542aa3c73b1513de706f4d23648a56b704824e8edb7c6a7efe2224f","abstract_canon_sha256":"bbbd23789ee31e2f0238372ece4ad1220ec86b764ce5927d1b0d7471a81ce25b"},"schema_version":"1.0"},"canonical_sha256":"e12843777e125599e9bf03698316d59d78d44319d5d3ff36be03bb78d249855f","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:13:46.993651Z","signature_b64":"d/VZt9WNrWRSXDqcNugN1YLIC954k34WV2UrK/4C4W8nD4aHM0Q70PkhNCPASX937l8T3xaED38BB5g/rTZOCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e12843777e125599e9bf03698316d59d78d44319d5d3ff36be03bb78d249855f","last_reissued_at":"2026-05-18T02:13:46.992951Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:13:46.992951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"0905.0906","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":"2026-05-18T02:13:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YOmzZNyQX0XrsJbQFiKBKjw2RsRWPdKoIKouEwI/r768il0T4H0jMvQiLIxOWUzSiusdexiFfpO7GpY2vmMBBw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T14:42:17.691328Z"},"content_sha256":"40c619a3d4e2f12ce165090fc436217fc21ee728fe3ec80baee289fd3d4655d8","schema_version":"1.0","event_id":"sha256:40c619a3d4e2f12ce165090fc436217fc21ee728fe3ec80baee289fd3d4655d8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2009:4EUEG536CJKZT2N7ANUYGFWVTV","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Search for Diffuse Neutral Hydrogen and HI Clouds in the NGC 2403 Group","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"Felix J. Lockman, Glen I. Langston, Katie M. Chynoweth, Kelly Holley-Bockelmann","submitted_at":"2009-05-06T20:03:04Z","abstract_excerpt":"We have observed the NGC 2403 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for faint, extended neutral hydrogen clouds similar to the clouds found around the M81/M82 group, which is located approximately 250 kpc from the NGC 2403 group along the same filament of galaxies. For an HI cloud with a size < 10 kpc within 50 kpc of a group galaxy, our 7-sigma mass detection limit is 2.2 x 10^6 M_sun for a cloud with a linewidth of 20 km/s, over the velocity range from -890 to 1750 km/s. At this sensitivity level we detect 3 new HI clouds in the direction of the gr"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.0906","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":"2026-05-18T02:13:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ZHHSPooM5Lih1Gr/i3vnXjt/ty4uYBgTT4IhWhXwkJIXzl0IxKzARIVsaINVMkoUCI7iG1kjHMRYUjwjk+WlCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T14:42:17.691667Z"},"content_sha256":"64411e6659843004444dee9a7cf109c0d9858e1aa84d802d97c97f396a9a629d","schema_version":"1.0","event_id":"sha256:64411e6659843004444dee9a7cf109c0d9858e1aa84d802d97c97f396a9a629d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4EUEG536CJKZT2N7ANUYGFWVTV/bundle.json","state_url":"https://pith.science/pith/4EUEG536CJKZT2N7ANUYGFWVTV/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4EUEG536CJKZT2N7ANUYGFWVTV/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":"2026-06-05T14:42:17Z","links":{"resolver":"https://pith.science/pith/4EUEG536CJKZT2N7ANUYGFWVTV","bundle":"https://pith.science/pith/4EUEG536CJKZT2N7ANUYGFWVTV/bundle.json","state":"https://pith.science/pith/4EUEG536CJKZT2N7ANUYGFWVTV/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4EUEG536CJKZT2N7ANUYGFWVTV/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2009:4EUEG536CJKZT2N7ANUYGFWVTV","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":"bbbd23789ee31e2f0238372ece4ad1220ec86b764ce5927d1b0d7471a81ce25b","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-05-06T20:03:04Z","title_canon_sha256":"b844df5b6542aa3c73b1513de706f4d23648a56b704824e8edb7c6a7efe2224f"},"schema_version":"1.0","source":{"id":"0905.0906","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"0905.0906","created_at":"2026-05-18T02:13:46Z"},{"alias_kind":"arxiv_version","alias_value":"0905.0906v1","created_at":"2026-05-18T02:13:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.0905.0906","created_at":"2026-05-18T02:13:46Z"},{"alias_kind":"pith_short_12","alias_value":"4EUEG536CJKZ","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_16","alias_value":"4EUEG536CJKZT2N7","created_at":"2026-05-18T12:25:58Z"},{"alias_kind":"pith_short_8","alias_value":"4EUEG536","created_at":"2026-05-18T12:25:58Z"}],"graph_snapshots":[{"event_id":"sha256:64411e6659843004444dee9a7cf109c0d9858e1aa84d802d97c97f396a9a629d","target":"graph","created_at":"2026-05-18T02:13:46Z","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":"We have observed the NGC 2403 group of galaxies using the Robert C. Byrd Green Bank Telescope (GBT) in a search for faint, extended neutral hydrogen clouds similar to the clouds found around the M81/M82 group, which is located approximately 250 kpc from the NGC 2403 group along the same filament of galaxies. For an HI cloud with a size < 10 kpc within 50 kpc of a group galaxy, our 7-sigma mass detection limit is 2.2 x 10^6 M_sun for a cloud with a linewidth of 20 km/s, over the velocity range from -890 to 1750 km/s. At this sensitivity level we detect 3 new HI clouds in the direction of the gr","authors_text":"Felix J. Lockman, Glen I. Langston, Katie M. Chynoweth, Kelly Holley-Bockelmann","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-05-06T20:03:04Z","title":"Search for Diffuse Neutral Hydrogen and HI Clouds in the NGC 2403 Group"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"0905.0906","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":"sha256:40c619a3d4e2f12ce165090fc436217fc21ee728fe3ec80baee289fd3d4655d8","target":"record","created_at":"2026-05-18T02:13:46Z","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":"bbbd23789ee31e2f0238372ece4ad1220ec86b764ce5927d1b0d7471a81ce25b","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2009-05-06T20:03:04Z","title_canon_sha256":"b844df5b6542aa3c73b1513de706f4d23648a56b704824e8edb7c6a7efe2224f"},"schema_version":"1.0","source":{"id":"0905.0906","kind":"arxiv","version":1}},"canonical_sha256":"e12843777e125599e9bf03698316d59d78d44319d5d3ff36be03bb78d249855f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e12843777e125599e9bf03698316d59d78d44319d5d3ff36be03bb78d249855f","first_computed_at":"2026-05-18T02:13:46.992951Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:13:46.992951Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"d/VZt9WNrWRSXDqcNugN1YLIC954k34WV2UrK/4C4W8nD4aHM0Q70PkhNCPASX937l8T3xaED38BB5g/rTZOCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:13:46.993651Z","signed_message":"canonical_sha256_bytes"},"source_id":"0905.0906","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:40c619a3d4e2f12ce165090fc436217fc21ee728fe3ec80baee289fd3d4655d8","sha256:64411e6659843004444dee9a7cf109c0d9858e1aa84d802d97c97f396a9a629d"],"state_sha256":"5097379273ea6b47dcc7aade9f2efc612a5747b92a90300d8359651502e755d8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"e9TPlqg9aiz0CKbLlA/1Gf4rHdP6saqgvDUQhc8/tZFHkI3MkD+mRtdiX4S2KuPRKX3OS9KFHBPREhlbtMQHDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T14:42:17.693458Z","bundle_sha256":"d2253373f5f50ae4f9fd90986e15cef4a6cb44b4cf90dfe837753580a54123ef"}}