{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:YVXQ377OVUXAXAGSM4MQLLUAIY","short_pith_number":"pith:YVXQ377O","canonical_record":{"source":{"id":"1008.1793","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-08-10T20:11:36Z","cross_cats_sorted":[],"title_canon_sha256":"a1ca5c1a958f2d8f96ea837d08d15728a5559519b05e5e86d7ef9e4699439062","abstract_canon_sha256":"aabc981dac79d039658fc50008e933e934646518052f44817aa064ee5558118b"},"schema_version":"1.0"},"canonical_sha256":"c56f0dffeead2e0b80d2671905ae80461eb1a7148be6bd208b070f967db17b9a","source":{"kind":"arxiv","id":"1008.1793","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.1793","created_at":"2026-05-18T02:05:49Z"},{"alias_kind":"arxiv_version","alias_value":"1008.1793v2","created_at":"2026-05-18T02:05:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.1793","created_at":"2026-05-18T02:05:49Z"},{"alias_kind":"pith_short_12","alias_value":"YVXQ377OVUXA","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"YVXQ377OVUXAXAGS","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"YVXQ377O","created_at":"2026-05-18T12:26:17Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:YVXQ377OVUXAXAGSM4MQLLUAIY","target":"record","payload":{"canonical_record":{"source":{"id":"1008.1793","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-08-10T20:11:36Z","cross_cats_sorted":[],"title_canon_sha256":"a1ca5c1a958f2d8f96ea837d08d15728a5559519b05e5e86d7ef9e4699439062","abstract_canon_sha256":"aabc981dac79d039658fc50008e933e934646518052f44817aa064ee5558118b"},"schema_version":"1.0"},"canonical_sha256":"c56f0dffeead2e0b80d2671905ae80461eb1a7148be6bd208b070f967db17b9a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:49.631056Z","signature_b64":"h+1EIMnm8ncPWBMLFxVPBp5zsZ89YmGgRSWYTA5IMsW/fkjaYVrdi/xWaRKrYqRk7+rpP3QCs48EEbOeHzq4AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c56f0dffeead2e0b80d2671905ae80461eb1a7148be6bd208b070f967db17b9a","last_reissued_at":"2026-05-18T02:05:49.630412Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:49.630412Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1008.1793","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":"2026-05-18T02:05:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"beYB9k/XRUzK30SNNJad/9TVpTXLAUakaL28K2F5zFTD/YcFPRuFjq04mEuFbWPAu66YRTrUzAf94SHuaPrRDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:49:15.952085Z"},"content_sha256":"a3b843c46d2261ae1b66e3441ecded3ae77c346e56e760dee53dcb43ae0f032b","schema_version":"1.0","event_id":"sha256:a3b843c46d2261ae1b66e3441ecded3ae77c346e56e760dee53dcb43ae0f032b"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:YVXQ377OVUXAXAGSM4MQLLUAIY","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Deepest Radio Study of the Pulsar Wind Nebula G21.5-0.9: Still No Evidence for the Supernova Shell","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Crystal Brogan, Heather Matheson, Michael F. Bietenholz, Norbert Bartel, Samar Safi-Harb","submitted_at":"2010-08-10T20:11:36Z","abstract_excerpt":"We report on sensitive new 1.4-GHz VLA radio observations of the pulsar wind nebula G21.5-0.9, powered by PSR J1833-1034, and its environs. Our observations were targeted at searching for the radio counterpart of the shell-like structure seen surrounding the pulsar wind nebula in X-rays. Some such radio emission might be expected as the ejecta from the <~ 1000 yr old supernova expand and interact with the surrounding medium. We find, however, no radio emission from the shell, and can place a conservative 3-sigma upper limit on its 1-GHz surface brightness of 7 x 10^-22 W/m^2/Hz/sr, comparable "},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.1793","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":""},"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":"2026-05-18T02:05:49Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"61p4Gzu/VOdCbyp9OjiTLQP7qr8J9a8aZSfKvYQ9G0zyDLTQ27LDetOJc6xDanSY9Y70OUp4qlT2GXzYK7OYBA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-27T11:49:15.952756Z"},"content_sha256":"4eaa71185e48ce9189143929dbf2544ae95553c067ce8b6cc2a69ecc277903de","schema_version":"1.0","event_id":"sha256:4eaa71185e48ce9189143929dbf2544ae95553c067ce8b6cc2a69ecc277903de"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YVXQ377OVUXAXAGSM4MQLLUAIY/bundle.json","state_url":"https://pith.science/pith/YVXQ377OVUXAXAGSM4MQLLUAIY/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YVXQ377OVUXAXAGSM4MQLLUAIY/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":"2026-05-27T11:49:15Z","links":{"resolver":"https://pith.science/pith/YVXQ377OVUXAXAGSM4MQLLUAIY","bundle":"https://pith.science/pith/YVXQ377OVUXAXAGSM4MQLLUAIY/bundle.json","state":"https://pith.science/pith/YVXQ377OVUXAXAGSM4MQLLUAIY/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YVXQ377OVUXAXAGSM4MQLLUAIY/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:YVXQ377OVUXAXAGSM4MQLLUAIY","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":"aabc981dac79d039658fc50008e933e934646518052f44817aa064ee5558118b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-08-10T20:11:36Z","title_canon_sha256":"a1ca5c1a958f2d8f96ea837d08d15728a5559519b05e5e86d7ef9e4699439062"},"schema_version":"1.0","source":{"id":"1008.1793","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1008.1793","created_at":"2026-05-18T02:05:49Z"},{"alias_kind":"arxiv_version","alias_value":"1008.1793v2","created_at":"2026-05-18T02:05:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1008.1793","created_at":"2026-05-18T02:05:49Z"},{"alias_kind":"pith_short_12","alias_value":"YVXQ377OVUXA","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_16","alias_value":"YVXQ377OVUXAXAGS","created_at":"2026-05-18T12:26:17Z"},{"alias_kind":"pith_short_8","alias_value":"YVXQ377O","created_at":"2026-05-18T12:26:17Z"}],"graph_snapshots":[{"event_id":"sha256:4eaa71185e48ce9189143929dbf2544ae95553c067ce8b6cc2a69ecc277903de","target":"graph","created_at":"2026-05-18T02:05:49Z","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 report on sensitive new 1.4-GHz VLA radio observations of the pulsar wind nebula G21.5-0.9, powered by PSR J1833-1034, and its environs. Our observations were targeted at searching for the radio counterpart of the shell-like structure seen surrounding the pulsar wind nebula in X-rays. Some such radio emission might be expected as the ejecta from the <~ 1000 yr old supernova expand and interact with the surrounding medium. We find, however, no radio emission from the shell, and can place a conservative 3-sigma upper limit on its 1-GHz surface brightness of 7 x 10^-22 W/m^2/Hz/sr, comparable ","authors_text":"Crystal Brogan, Heather Matheson, Michael F. Bietenholz, Norbert Bartel, Samar Safi-Harb","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-08-10T20:11:36Z","title":"The Deepest Radio Study of the Pulsar Wind Nebula G21.5-0.9: Still No Evidence for the Supernova Shell"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1008.1793","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:a3b843c46d2261ae1b66e3441ecded3ae77c346e56e760dee53dcb43ae0f032b","target":"record","created_at":"2026-05-18T02:05:49Z","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":"aabc981dac79d039658fc50008e933e934646518052f44817aa064ee5558118b","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-08-10T20:11:36Z","title_canon_sha256":"a1ca5c1a958f2d8f96ea837d08d15728a5559519b05e5e86d7ef9e4699439062"},"schema_version":"1.0","source":{"id":"1008.1793","kind":"arxiv","version":2}},"canonical_sha256":"c56f0dffeead2e0b80d2671905ae80461eb1a7148be6bd208b070f967db17b9a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c56f0dffeead2e0b80d2671905ae80461eb1a7148be6bd208b070f967db17b9a","first_computed_at":"2026-05-18T02:05:49.630412Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:49.630412Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"h+1EIMnm8ncPWBMLFxVPBp5zsZ89YmGgRSWYTA5IMsW/fkjaYVrdi/xWaRKrYqRk7+rpP3QCs48EEbOeHzq4AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:49.631056Z","signed_message":"canonical_sha256_bytes"},"source_id":"1008.1793","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a3b843c46d2261ae1b66e3441ecded3ae77c346e56e760dee53dcb43ae0f032b","sha256:4eaa71185e48ce9189143929dbf2544ae95553c067ce8b6cc2a69ecc277903de"],"state_sha256":"99de29b494f75b40943ed361f1db5fc7a541c6bf8533510f785ccb8ac859baaa"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"5eouulMUMtI4vEQe/ODy9U7IsKYRTMK3CQDQ2a8oN3KRDtC4fU4Es4OLtD2WSGOJxhrWzqfYXyUuxG5Gq9i5CA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-27T11:49:15.956334Z","bundle_sha256":"389bd4b2c39db9e7ea0548289e18a488fbd9944e66e698a686da7ee9e6d4bd5e"}}