{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:62AROM54V2A5BRV7RKLEO2VYA2","short_pith_number":"pith:62AROM54","canonical_record":{"source":{"id":"1009.2296","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-09-13T04:39:55Z","cross_cats_sorted":[],"title_canon_sha256":"02ca102f14d92ca0ad1f7e124b808490241166aa9efd5916690063ec1a6a9afd","abstract_canon_sha256":"bd69df1e24e883a75789c1617640f8b94fdf1b13774de7667c77f4a8c8fae795"},"schema_version":"1.0"},"canonical_sha256":"f6811733bcae81d0c6bf8a96476ab806b6d9df21d77f5cad9669cc414eb45567","source":{"kind":"arxiv","id":"1009.2296","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.2296","created_at":"2026-05-18T02:05:31Z"},{"alias_kind":"arxiv_version","alias_value":"1009.2296v1","created_at":"2026-05-18T02:05:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.2296","created_at":"2026-05-18T02:05:31Z"},{"alias_kind":"pith_short_12","alias_value":"62AROM54V2A5","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"62AROM54V2A5BRV7","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"62AROM54","created_at":"2026-05-18T12:26:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:62AROM54V2A5BRV7RKLEO2VYA2","target":"record","payload":{"canonical_record":{"source":{"id":"1009.2296","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-09-13T04:39:55Z","cross_cats_sorted":[],"title_canon_sha256":"02ca102f14d92ca0ad1f7e124b808490241166aa9efd5916690063ec1a6a9afd","abstract_canon_sha256":"bd69df1e24e883a75789c1617640f8b94fdf1b13774de7667c77f4a8c8fae795"},"schema_version":"1.0"},"canonical_sha256":"f6811733bcae81d0c6bf8a96476ab806b6d9df21d77f5cad9669cc414eb45567","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:31.431934Z","signature_b64":"DvutVo3DJiilrZI/Nw9zMQIuti6nUhZP/aZDmjP0JIV5JnJwkPhF/6WRMASDHJnL6dp4Oy7xovIJYtoiAEi8DA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f6811733bcae81d0c6bf8a96476ab806b6d9df21d77f5cad9669cc414eb45567","last_reissued_at":"2026-05-18T02:05:31.431264Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:31.431264Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1009.2296","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":"2026-05-18T02:05:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YxKNihGoaworKvCqblERA3J9tvAf9jALiM0s86XNuYzcHyfVPdxc5FbSSLd0+5QGDmEla4AKS5jzTWaE4x/oAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:10:02.777625Z"},"content_sha256":"6a98b06463e8f40b1375a151ccf8bccbdc94a826c883289a3f16ef1f488933d3","schema_version":"1.0","event_id":"sha256:6a98b06463e8f40b1375a151ccf8bccbdc94a826c883289a3f16ef1f488933d3"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:62AROM54V2A5BRV7RKLEO2VYA2","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Radius-expansion burst spectra from 4U 1728-34: an ultracompact binary?","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"(2) U. Colorado, (3) MIT, (4) U. California Berkeley), Australia, Duncan K. Galloway (1), Herman Marshall (3), Nevin Weinberg (4) ((1) Monash University, Yangsen Yao (2), Zdenka Misanovic (1)","submitted_at":"2010-09-13T04:39:55Z","abstract_excerpt":"Recent theoretical and observational studies have shown that ashes from thermonuclear burning may be ejected during radius-expansion bursts, giving rise to photoionisation edges in the X-ray spectra. We report a search for such features in Chandra spectra observed from the low-mass X-ray binary 4U 1728-34. We analysed the spectra from four radius-expansion bursts detected in 2006 July, and two in 2002 March, but found no evidence for discrete features. We estimate upper limits for the equivalent widths of edges of a few hundred eV, which for the moderate temperatures observed during the bursts"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.2296","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":"2026-05-18T02:05:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V9v79t5FCakhtPRKsqZzjJvswFgtwlRXJbjGhOxT+IbQ+1KfwlTYlBGmS1WVKYtpLpqXfbyd/h9LYwg7uLddCQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-31T10:10:02.777977Z"},"content_sha256":"158cbb50232c035b61c884082e616dd3545a1e6e09afa04892d69c8447d477bd","schema_version":"1.0","event_id":"sha256:158cbb50232c035b61c884082e616dd3545a1e6e09afa04892d69c8447d477bd"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/62AROM54V2A5BRV7RKLEO2VYA2/bundle.json","state_url":"https://pith.science/pith/62AROM54V2A5BRV7RKLEO2VYA2/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/62AROM54V2A5BRV7RKLEO2VYA2/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":"2026-05-31T10:10:02Z","links":{"resolver":"https://pith.science/pith/62AROM54V2A5BRV7RKLEO2VYA2","bundle":"https://pith.science/pith/62AROM54V2A5BRV7RKLEO2VYA2/bundle.json","state":"https://pith.science/pith/62AROM54V2A5BRV7RKLEO2VYA2/state.json","well_known_bundle":"https://pith.science/.well-known/pith/62AROM54V2A5BRV7RKLEO2VYA2/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:62AROM54V2A5BRV7RKLEO2VYA2","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":"bd69df1e24e883a75789c1617640f8b94fdf1b13774de7667c77f4a8c8fae795","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-09-13T04:39:55Z","title_canon_sha256":"02ca102f14d92ca0ad1f7e124b808490241166aa9efd5916690063ec1a6a9afd"},"schema_version":"1.0","source":{"id":"1009.2296","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1009.2296","created_at":"2026-05-18T02:05:31Z"},{"alias_kind":"arxiv_version","alias_value":"1009.2296v1","created_at":"2026-05-18T02:05:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1009.2296","created_at":"2026-05-18T02:05:31Z"},{"alias_kind":"pith_short_12","alias_value":"62AROM54V2A5","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"62AROM54V2A5BRV7","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"62AROM54","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:158cbb50232c035b61c884082e616dd3545a1e6e09afa04892d69c8447d477bd","target":"graph","created_at":"2026-05-18T02:05:31Z","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":"Recent theoretical and observational studies have shown that ashes from thermonuclear burning may be ejected during radius-expansion bursts, giving rise to photoionisation edges in the X-ray spectra. We report a search for such features in Chandra spectra observed from the low-mass X-ray binary 4U 1728-34. We analysed the spectra from four radius-expansion bursts detected in 2006 July, and two in 2002 March, but found no evidence for discrete features. We estimate upper limits for the equivalent widths of edges of a few hundred eV, which for the moderate temperatures observed during the bursts","authors_text":"(2) U. Colorado, (3) MIT, (4) U. California Berkeley), Australia, Duncan K. Galloway (1), Herman Marshall (3), Nevin Weinberg (4) ((1) Monash University, Yangsen Yao (2), Zdenka Misanovic (1)","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-09-13T04:39:55Z","title":"Radius-expansion burst spectra from 4U 1728-34: an ultracompact binary?"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1009.2296","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":"sha256:6a98b06463e8f40b1375a151ccf8bccbdc94a826c883289a3f16ef1f488933d3","target":"record","created_at":"2026-05-18T02:05:31Z","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":"bd69df1e24e883a75789c1617640f8b94fdf1b13774de7667c77f4a8c8fae795","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2010-09-13T04:39:55Z","title_canon_sha256":"02ca102f14d92ca0ad1f7e124b808490241166aa9efd5916690063ec1a6a9afd"},"schema_version":"1.0","source":{"id":"1009.2296","kind":"arxiv","version":1}},"canonical_sha256":"f6811733bcae81d0c6bf8a96476ab806b6d9df21d77f5cad9669cc414eb45567","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"f6811733bcae81d0c6bf8a96476ab806b6d9df21d77f5cad9669cc414eb45567","first_computed_at":"2026-05-18T02:05:31.431264Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:05:31.431264Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"DvutVo3DJiilrZI/Nw9zMQIuti6nUhZP/aZDmjP0JIV5JnJwkPhF/6WRMASDHJnL6dp4Oy7xovIJYtoiAEi8DA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:05:31.431934Z","signed_message":"canonical_sha256_bytes"},"source_id":"1009.2296","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:6a98b06463e8f40b1375a151ccf8bccbdc94a826c883289a3f16ef1f488933d3","sha256:158cbb50232c035b61c884082e616dd3545a1e6e09afa04892d69c8447d477bd"],"state_sha256":"3df25366d0306d4dc5b29fd22491e76c96ee2f34d69baffd8f4f6e4b86846482"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Wg9fj73LUN0g8wjXdN/Et5YncbtEYTr39IzNu8q3MPYnyrShccKWNXRyUJMlI9IRBuBlqMN5IgFY3kKmCMoIAw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-31T10:10:02.781859Z","bundle_sha256":"f9b736f7292b02f40837b00bb9cf7cd97384de85f8d1e4f569b023cb59bbed8f"}}