{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:XLDZMUZC5M5N272KQQP72IXM37","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":"c718e6486778010a59f07303ec32ded61da2ee1e5c0144b2468ce29ab9f9fb08","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-09-27T14:19:38Z","title_canon_sha256":"e157ae59f7201c7a899ae56bf00b976ef3628b6309d1e919b47673d4f54d4bf6"},"schema_version":"1.0","source":{"id":"1909.13810","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1909.13810","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"arxiv_version","alias_value":"1909.13810v2","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1909.13810","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_12","alias_value":"XLDZMUZC5M5N","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_16","alias_value":"XLDZMUZC5M5N272K","created_at":"2026-07-05T00:33:17Z"},{"alias_kind":"pith_short_8","alias_value":"XLDZMUZC","created_at":"2026-07-05T00:33:17Z"}],"graph_snapshots":[{"event_id":"sha256:f323911a234bbe5b1fc9d97a8e7f6d26a2182af56239c732ad2a81d4b590d57b","target":"graph","created_at":"2026-07-05T00:33:17Z","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/1909.13810/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"There is a strong degeneracy between the luminosity distance ($D_L$) and the observer viewing angle ($\\theta_{\\rm obs}$; hereafter viewing angle) of the gravitational wave (GW) source with an electromagnetic counterpart, GW170817. Here, for the first time, we present independent constraints on $\\theta_{\\rm obs} = 32.5 ^{\\circ +11.7}_{-9.7}$ from broad-band photometry of the kilonova (kN) AT2017gfo associated with GW170817. These constraints are consistent with independent results presented in the literature using the associated gamma ray burst GRB170817A. Combining the constraints on $\\theta_{","authors_text":"A. Goobar, A. Sagu\\'es Carracedo, C. N. Setzer, M. Bulla, S. Dhawan","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-09-27T14:19:38Z","title":"Constraining the observer angle of the kilonova AT2017gfo associated with GW170817: Implications for the Hubble constant"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1909.13810","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:b67ddceb4688372ab8c3fc4718d9dc1d83f1bbd46e4b62561e90bcc7c14f6762","target":"record","created_at":"2026-07-05T00:33:17Z","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":"c718e6486778010a59f07303ec32ded61da2ee1e5c0144b2468ce29ab9f9fb08","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2019-09-27T14:19:38Z","title_canon_sha256":"e157ae59f7201c7a899ae56bf00b976ef3628b6309d1e919b47673d4f54d4bf6"},"schema_version":"1.0","source":{"id":"1909.13810","kind":"arxiv","version":2}},"canonical_sha256":"bac7965322eb3add7f4a841ffd22ecdfcf260f827e88e83e0b42aae0adb75470","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bac7965322eb3add7f4a841ffd22ecdfcf260f827e88e83e0b42aae0adb75470","first_computed_at":"2026-07-05T00:33:17.788311Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T00:33:17.788311Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"NQWo51DlHeXcC74rOXKwfFSfHSTkXWIWMLeudFY3DRcN/K5LaMcAUVbpvAhZGvSFsgw6w8zfPwijgyEC8EYDCw==","signature_status":"signed_v1","signed_at":"2026-07-05T00:33:17.788805Z","signed_message":"canonical_sha256_bytes"},"source_id":"1909.13810","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:b67ddceb4688372ab8c3fc4718d9dc1d83f1bbd46e4b62561e90bcc7c14f6762","sha256:f323911a234bbe5b1fc9d97a8e7f6d26a2182af56239c732ad2a81d4b590d57b"],"state_sha256":"e78a101f9e5feb463f313bc119af717b4cac37c01a440a00543c1dd979bc8a3b"}