{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2020:X33XNWFUPWSYQH6VPVNQSQ3FDG","short_pith_number":"pith:X33XNWFU","canonical_record":{"source":{"id":"2008.07420","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-17T15:44:14Z","cross_cats_sorted":["astro-ph.CO","gr-qc"],"title_canon_sha256":"e473b4c137af6f7a65b4f25cca2c989f7c0693fdb998a4afecb098311b66a127","abstract_canon_sha256":"7eac8beb90bc93dddcc0d78bbe4078f0ac284f2134efef375e42ba6e616ae5c8"},"schema_version":"1.0"},"canonical_sha256":"bef776d8b47da5881fd57d5b094365198ba41811fd240bff2eae9ca3f84009f5","source":{"kind":"arxiv","id":"2008.07420","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.07420","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"arxiv_version","alias_value":"2008.07420v2","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.07420","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"pith_short_12","alias_value":"X33XNWFUPWSY","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"pith_short_16","alias_value":"X33XNWFUPWSYQH6V","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"pith_short_8","alias_value":"X33XNWFU","created_at":"2026-07-05T01:31:12Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2020:X33XNWFUPWSYQH6VPVNQSQ3FDG","target":"record","payload":{"canonical_record":{"source":{"id":"2008.07420","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-17T15:44:14Z","cross_cats_sorted":["astro-ph.CO","gr-qc"],"title_canon_sha256":"e473b4c137af6f7a65b4f25cca2c989f7c0693fdb998a4afecb098311b66a127","abstract_canon_sha256":"7eac8beb90bc93dddcc0d78bbe4078f0ac284f2134efef375e42ba6e616ae5c8"},"schema_version":"1.0"},"canonical_sha256":"bef776d8b47da5881fd57d5b094365198ba41811fd240bff2eae9ca3f84009f5","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-05T01:31:12.284248Z","signature_b64":"3H87x7Ce0CeapGioKmbu17YKmKjcqDZ0lV4vdiV1N4waYxHcRSivRiMCmkVsq37SePNceU1DCIvgLUtWSvd5BQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bef776d8b47da5881fd57d5b094365198ba41811fd240bff2eae9ca3f84009f5","last_reissued_at":"2026-07-05T01:31:12.283811Z","signature_status":"signed_v1","first_computed_at":"2026-07-05T01:31:12.283811Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2008.07420","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":"2026-07-05T01:31:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"ynTYUIQTChnO5XH7ahtjMj9WnoVfk5jmcWVLY/+K+AiHx0K3K3K3P/kT2bTBSyOagk8sk+MvY8UflWfiWu5LDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T10:59:52.085352Z"},"content_sha256":"db931b9c106035e9848312d76768ba2d6a8e3cf9880911ee8edf20eb4da976c0","schema_version":"1.0","event_id":"sha256:db931b9c106035e9848312d76768ba2d6a8e3cf9880911ee8edf20eb4da976c0"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2020:X33XNWFUPWSYQH6VPVNQSQ3FDG","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Measuring the Hubble Constant with a sample of kilonovae","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO","gr-qc"],"primary_cat":"astro-ph.HE","authors_text":"David A. Coulter, Jack Heinzel, Lina Issa, Mattia Bulla, Michael W. Coughlin, Nandita Khetan, Nelson Christensen, Ryan J. Foley, Sarah Antier, Tim Dietrich","submitted_at":"2020-08-17T15:44:14Z","abstract_excerpt":"Kilonovae produced by the coalescence of compact binaries with at least one neutron star are promising standard sirens for an independent measurement of the Hubble constant ($H_0$). Through their detection via follow-up of gravitational-wave (GW), short gamma-ray bursts (sGRBs) or optical surveys, a large sample of kilonovae (even without GW data) can be used for $H_0$ contraints. Here, we show measurement of $H_0$ using light curves associated with four sGRBs, assuming these are attributable to kilonovae, combined with GW170817. Including a systematic uncertainty on the models that is as larg"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.07420","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/2008.07420/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":"2026-07-05T01:31:12Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QvACqofi7QwtD9aVycFT+1/TiSTL3u2AQ/D3fcoTUpWh9kSre7Gkiqdaxl1DDByBq9Xj1WYdRv3SCaO9k7V/CA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-08-15T10:59:52.085925Z"},"content_sha256":"50a018689064165e8bd2a984b5c1b658c389f2760fadcca543bef1027049770c","schema_version":"1.0","event_id":"sha256:50a018689064165e8bd2a984b5c1b658c389f2760fadcca543bef1027049770c"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG/bundle.json","state_url":"https://pith.science/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG/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":"2026-08-15T10:59:52Z","links":{"resolver":"https://pith.science/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG","bundle":"https://pith.science/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG/bundle.json","state":"https://pith.science/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X33XNWFUPWSYQH6VPVNQSQ3FDG/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2020:X33XNWFUPWSYQH6VPVNQSQ3FDG","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":"7eac8beb90bc93dddcc0d78bbe4078f0ac284f2134efef375e42ba6e616ae5c8","cross_cats_sorted":["astro-ph.CO","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-17T15:44:14Z","title_canon_sha256":"e473b4c137af6f7a65b4f25cca2c989f7c0693fdb998a4afecb098311b66a127"},"schema_version":"1.0","source":{"id":"2008.07420","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2008.07420","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"arxiv_version","alias_value":"2008.07420v2","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2008.07420","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"pith_short_12","alias_value":"X33XNWFUPWSY","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"pith_short_16","alias_value":"X33XNWFUPWSYQH6V","created_at":"2026-07-05T01:31:12Z"},{"alias_kind":"pith_short_8","alias_value":"X33XNWFU","created_at":"2026-07-05T01:31:12Z"}],"graph_snapshots":[{"event_id":"sha256:50a018689064165e8bd2a984b5c1b658c389f2760fadcca543bef1027049770c","target":"graph","created_at":"2026-07-05T01:31:12Z","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/2008.07420/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"Kilonovae produced by the coalescence of compact binaries with at least one neutron star are promising standard sirens for an independent measurement of the Hubble constant ($H_0$). Through their detection via follow-up of gravitational-wave (GW), short gamma-ray bursts (sGRBs) or optical surveys, a large sample of kilonovae (even without GW data) can be used for $H_0$ contraints. Here, we show measurement of $H_0$ using light curves associated with four sGRBs, assuming these are attributable to kilonovae, combined with GW170817. Including a systematic uncertainty on the models that is as larg","authors_text":"David A. Coulter, Jack Heinzel, Lina Issa, Mattia Bulla, Michael W. Coughlin, Nandita Khetan, Nelson Christensen, Ryan J. Foley, Sarah Antier, Tim Dietrich","cross_cats":["astro-ph.CO","gr-qc"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-17T15:44:14Z","title":"Measuring the Hubble Constant with a sample of kilonovae"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2008.07420","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:db931b9c106035e9848312d76768ba2d6a8e3cf9880911ee8edf20eb4da976c0","target":"record","created_at":"2026-07-05T01:31:12Z","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":"7eac8beb90bc93dddcc0d78bbe4078f0ac284f2134efef375e42ba6e616ae5c8","cross_cats_sorted":["astro-ph.CO","gr-qc"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2020-08-17T15:44:14Z","title_canon_sha256":"e473b4c137af6f7a65b4f25cca2c989f7c0693fdb998a4afecb098311b66a127"},"schema_version":"1.0","source":{"id":"2008.07420","kind":"arxiv","version":2}},"canonical_sha256":"bef776d8b47da5881fd57d5b094365198ba41811fd240bff2eae9ca3f84009f5","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bef776d8b47da5881fd57d5b094365198ba41811fd240bff2eae9ca3f84009f5","first_computed_at":"2026-07-05T01:31:12.283811Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T01:31:12.283811Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"3H87x7Ce0CeapGioKmbu17YKmKjcqDZ0lV4vdiV1N4waYxHcRSivRiMCmkVsq37SePNceU1DCIvgLUtWSvd5BQ==","signature_status":"signed_v1","signed_at":"2026-07-05T01:31:12.284248Z","signed_message":"canonical_sha256_bytes"},"source_id":"2008.07420","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:db931b9c106035e9848312d76768ba2d6a8e3cf9880911ee8edf20eb4da976c0","sha256:50a018689064165e8bd2a984b5c1b658c389f2760fadcca543bef1027049770c"],"state_sha256":"701d7ea1c8c0da4d32c830bd0fc099647fb6b37fa72e859ba5ef615872cc99cb"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"eMnImeVInn/YQzUR7KQ7mhcgRt5v9bc/TTPCWUQtRaku/MK+qka63juHuG3o2ol820MXsArzgq+8IJiMpzPvDg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-08-15T10:59:52.091116Z","bundle_sha256":"8e737e4c51e74b319714d7c6369ac30bad246c3ceeac85ff5d96d5b3c9084b29"}}