{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:H72VGIMPF32LGZGSF6LBYZT73D","short_pith_number":"pith:H72VGIMP","canonical_record":{"source":{"id":"1903.02660","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-03-06T23:47:01Z","cross_cats_sorted":[],"title_canon_sha256":"aff67a5902bc79b0c896cc87538fb1bc58e0152b8c20f7b93d8a45ca40258cda","abstract_canon_sha256":"264da90603484fe4d16e776a5963c1c076ed02dfce526a13ec81ce2cb37897d0"},"schema_version":"1.0"},"canonical_sha256":"3ff553218f2ef4b364d22f961c667fd8e14a6a96572792dbdbeec88d06c3b0b5","source":{"kind":"arxiv","id":"1903.02660","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.02660","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"arxiv_version","alias_value":"1903.02660v2","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.02660","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"pith_short_12","alias_value":"H72VGIMPF32L","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"pith_short_16","alias_value":"H72VGIMPF32LGZGS","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"pith_short_8","alias_value":"H72VGIMP","created_at":"2026-07-04T23:51:39Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:H72VGIMPF32LGZGSF6LBYZT73D","target":"record","payload":{"canonical_record":{"source":{"id":"1903.02660","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-03-06T23:47:01Z","cross_cats_sorted":[],"title_canon_sha256":"aff67a5902bc79b0c896cc87538fb1bc58e0152b8c20f7b93d8a45ca40258cda","abstract_canon_sha256":"264da90603484fe4d16e776a5963c1c076ed02dfce526a13ec81ce2cb37897d0"},"schema_version":"1.0"},"canonical_sha256":"3ff553218f2ef4b364d22f961c667fd8e14a6a96572792dbdbeec88d06c3b0b5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T23:51:39.891263Z","signature_b64":"HcGAIsnt3GlU1kO4kGP9g4KVkJWDFloK3jEuByvhKUelvEovMvw8m5/vTEgZG8JTVQk4MvBPWFsECyePD1o3DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3ff553218f2ef4b364d22f961c667fd8e14a6a96572792dbdbeec88d06c3b0b5","last_reissued_at":"2026-07-04T23:51:39.890831Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T23:51:39.890831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.02660","source_version":2,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-07-04T23:51:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SZQGBBrCCIz7RJjgMGH/C0F+oBy/ey/+QE+IUVRvLX7ZIfyCKikwXvce2DQCiBSwAVHcn2l2+dRDLP7gxzL6AA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-15T08:53:13.155363Z"},"content_sha256":"9d6e3747ac9fbdb3779394aed57d6260e2496d83be7bd1425287c6f07eda0521","schema_version":"1.0","event_id":"sha256:9d6e3747ac9fbdb3779394aed57d6260e2496d83be7bd1425287c6f07eda0521"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:H72VGIMPF32LGZGSF6LBYZT73D","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spin frequency evolution and pulse profile variations of the recently re-activated radio magnetar XTE J1810-197","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. G. Lyne, B. W. Stappers, G. Desvignes, L. Levin, M. Kramer, M. Mickaliger, P. Weltevrede, R. Karuppusamy, R. P. Eatough","submitted_at":"2019-03-06T23:47:01Z","abstract_excerpt":"After spending almost a decade in a radio-quiet state, the Anomalous X-ray Pulsar XTE J1810-197 turned back on in early December 2018. We have observed this radio magnetar at 1.5 GHz with ~daily cadence since the first detection of radio re-activation on 8 December 2018. In this paper, we report on the current timing properties of XTE J1810-197 and find that the magnitude of the spin frequency derivative has increased by a factor of 2.6 over our 48-day data set. We compare our results with the spin-down evolution reported during its previous active phase in the radio band. We also present tota"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.02660","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/1903.02660/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-07-04T23:51:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"gwH0X8tgIKY0llfJAgOs7WFLT96MFo2wVx9dqOR2PxV5R2x9xGpMryl34LVxdfB/OEHDyD07pBaiw9z2jmzBCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-07-15T08:53:13.155734Z"},"content_sha256":"e7455cd3646119f4f9c361bf2155017e101c24469eac8402dc608805f95f9a6c","schema_version":"1.0","event_id":"sha256:e7455cd3646119f4f9c361bf2155017e101c24469eac8402dc608805f95f9a6c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/H72VGIMPF32LGZGSF6LBYZT73D/bundle.json","state_url":"https://pith.science/pith/H72VGIMPF32LGZGSF6LBYZT73D/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/H72VGIMPF32LGZGSF6LBYZT73D/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":"2026-07-15T08:53:13Z","links":{"resolver":"https://pith.science/pith/H72VGIMPF32LGZGSF6LBYZT73D","bundle":"https://pith.science/pith/H72VGIMPF32LGZGSF6LBYZT73D/bundle.json","state":"https://pith.science/pith/H72VGIMPF32LGZGSF6LBYZT73D/state.json","well_known_bundle":"https://pith.science/.well-known/pith/H72VGIMPF32LGZGSF6LBYZT73D/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:H72VGIMPF32LGZGSF6LBYZT73D","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":"264da90603484fe4d16e776a5963c1c076ed02dfce526a13ec81ce2cb37897d0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-03-06T23:47:01Z","title_canon_sha256":"aff67a5902bc79b0c896cc87538fb1bc58e0152b8c20f7b93d8a45ca40258cda"},"schema_version":"1.0","source":{"id":"1903.02660","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.02660","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"arxiv_version","alias_value":"1903.02660v2","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.02660","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"pith_short_12","alias_value":"H72VGIMPF32L","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"pith_short_16","alias_value":"H72VGIMPF32LGZGS","created_at":"2026-07-04T23:51:39Z"},{"alias_kind":"pith_short_8","alias_value":"H72VGIMP","created_at":"2026-07-04T23:51:39Z"}],"graph_snapshots":[{"event_id":"sha256:e7455cd3646119f4f9c361bf2155017e101c24469eac8402dc608805f95f9a6c","target":"graph","created_at":"2026-07-04T23:51:39Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/1903.02660/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"After spending almost a decade in a radio-quiet state, the Anomalous X-ray Pulsar XTE J1810-197 turned back on in early December 2018. We have observed this radio magnetar at 1.5 GHz with ~daily cadence since the first detection of radio re-activation on 8 December 2018. In this paper, we report on the current timing properties of XTE J1810-197 and find that the magnitude of the spin frequency derivative has increased by a factor of 2.6 over our 48-day data set. We compare our results with the spin-down evolution reported during its previous active phase in the radio band. We also present tota","authors_text":"A. G. Lyne, B. W. Stappers, G. Desvignes, L. Levin, M. Kramer, M. Mickaliger, P. Weltevrede, R. Karuppusamy, R. P. Eatough","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-03-06T23:47:01Z","title":"Spin frequency evolution and pulse profile variations of the recently re-activated radio magnetar XTE J1810-197"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.02660","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":"sha256:9d6e3747ac9fbdb3779394aed57d6260e2496d83be7bd1425287c6f07eda0521","target":"record","created_at":"2026-07-04T23:51:39Z","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":"264da90603484fe4d16e776a5963c1c076ed02dfce526a13ec81ce2cb37897d0","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-03-06T23:47:01Z","title_canon_sha256":"aff67a5902bc79b0c896cc87538fb1bc58e0152b8c20f7b93d8a45ca40258cda"},"schema_version":"1.0","source":{"id":"1903.02660","kind":"arxiv","version":2}},"canonical_sha256":"3ff553218f2ef4b364d22f961c667fd8e14a6a96572792dbdbeec88d06c3b0b5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3ff553218f2ef4b364d22f961c667fd8e14a6a96572792dbdbeec88d06c3b0b5","first_computed_at":"2026-07-04T23:51:39.890831Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-04T23:51:39.890831Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HcGAIsnt3GlU1kO4kGP9g4KVkJWDFloK3jEuByvhKUelvEovMvw8m5/vTEgZG8JTVQk4MvBPWFsECyePD1o3DA==","signature_status":"signed_v1","signed_at":"2026-07-04T23:51:39.891263Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.02660","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:9d6e3747ac9fbdb3779394aed57d6260e2496d83be7bd1425287c6f07eda0521","sha256:e7455cd3646119f4f9c361bf2155017e101c24469eac8402dc608805f95f9a6c"],"state_sha256":"287c1bf4e5db78e013816b9c4c02dbb8d1a821a2f7e9b4a5b2a041404a776fea"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5YcwpYwdTuGF8HQDibExzj9hdYnHK51s6i7Vle/i4Q1wvhmRmn3F5dBY2JXFo/+os6DwdVR+ld63FBHGMMsoCA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-07-15T08:53:13.157915Z","bundle_sha256":"23bc953e8f9dd92ae03bdcf8a2c243a1ce4e8f4daa78fad427680ef668c8ef09"}}