{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:YCZUCY5JUF3YYX2CSMIPDNHGMH","short_pith_number":"pith:YCZUCY5J","canonical_record":{"source":{"id":"1602.04156","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-12T18:56:45Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"fcd5c1063523859d62a83bce6e0aa7c2f68e77da31cb6c356e1e76239981ef3a","abstract_canon_sha256":"d4172f1d1d84177bd2edc5e1e930d18682d129d66c7b62ab7d8d2bbd2a547a2d"},"schema_version":"1.0"},"canonical_sha256":"c0b34163a9a1778c5f429310f1b4e661ee625084b0d7d9a1f6f8586c3d7415e1","source":{"kind":"arxiv","id":"1602.04156","version":4},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.04156","created_at":"2026-05-18T01:04:13Z"},{"alias_kind":"arxiv_version","alias_value":"1602.04156v4","created_at":"2026-05-18T01:04:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.04156","created_at":"2026-05-18T01:04:13Z"},{"alias_kind":"pith_short_12","alias_value":"YCZUCY5JUF3Y","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YCZUCY5JUF3YYX2C","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YCZUCY5J","created_at":"2026-05-18T12:30:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:YCZUCY5JUF3YYX2CSMIPDNHGMH","target":"record","payload":{"canonical_record":{"source":{"id":"1602.04156","kind":"arxiv","version":4},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-12T18:56:45Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"fcd5c1063523859d62a83bce6e0aa7c2f68e77da31cb6c356e1e76239981ef3a","abstract_canon_sha256":"d4172f1d1d84177bd2edc5e1e930d18682d129d66c7b62ab7d8d2bbd2a547a2d"},"schema_version":"1.0"},"canonical_sha256":"c0b34163a9a1778c5f429310f1b4e661ee625084b0d7d9a1f6f8586c3d7415e1","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:04:13.849181Z","signature_b64":"q93//c5lcpbxlcUfo/0fE678YGPJwu4Z6i9RNhisFBmmO3M5qvUWLsy1cJS4DeDJd4gAntCJzze8ycwVrHewBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c0b34163a9a1778c5f429310f1b4e661ee625084b0d7d9a1f6f8586c3d7415e1","last_reissued_at":"2026-05-18T01:04:13.848783Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:04:13.848783Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1602.04156","source_version":4,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T01:04:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"1iZamLzMHkLZRi6/ZLiT5JEMFH31q05kF4XttaeZyLfHJi8YSm64xZtSSJ4pDLRQJoJlOb4vJAcdD7EvkjZqDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T11:21:21.424438Z"},"content_sha256":"2ff311592e48991c758296cbc31fe2f7aa01cf27d91ab83ed7e8053930bdbea7","schema_version":"1.0","event_id":"sha256:2ff311592e48991c758296cbc31fe2f7aa01cf27d91ab83ed7e8053930bdbea7"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:YCZUCY5JUF3YYX2CSMIPDNHGMH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Pan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational wave source GW150914","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"A. Gal-Yam, A. Heinze, A. Mitra, A. Razza, A. Rest, A. S. B. Schultz, A. Sherstyuk, B. Gibson, B. Stalder, C. Baltay, C. Inserra, C. Waters, C. W. Stubbs, D. E. Wright, D. Rabinowitz, D. R. Young, E. A. Magnier, E. Cappellaro, E. Kankare, F. E Olivares, G. Terreran, H. Campbell, H. Flewelling, J. D. Lyman, J. Harmanen, J. P. Anderson, J. Sollerman, J. Tonry, K. C. Chambers, K. Maguire, K. W. Smith, L. Denneau, L. Galbany, L. Le Guillou, M. Coughlin, M. Della Valle, M. Dennefeld, M. E. Huber, M. Fraser, M. Nicholl, M. Smith, M. T. Botticella, M. Willman, N. Elias-Rosa, N. Primak, R. Kotak, S.J. Smartt, S. Valenti, T. Goggia, T. Kupfer, T.-W. Chen","submitted_at":"2016-02-12T18:56:45Z","abstract_excerpt":"We searched for an optical counterpart to the first gravitational wave source discovered by LIGO (GW150914), using a combination of the Pan-STARRS1 wide-field telescope and the PESSTO spectroscopic follow-up programme. As the final LIGO sky maps changed during analysis, the total probability of the source being spatially coincident with our fields was finally only 4.2 per cent. Therefore we discuss our results primarily as a demonstration of the survey capability of Pan-STARRS and spectroscopic capability of PESSTO. We mapped out 442 square degrees of the northern sky region of the initial map"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.04156","kind":"arxiv","version":4},"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":"2026-05-18T01:04:13Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"YAyN5JmqutQy9z2opzQXnYtGTz61irPCiQ1zYAkd/GMmtBIjvw4aUwZfSJq5vYoZ95DhfZ3coHP51/FDuxH0Ag==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-09T11:21:21.424803Z"},"content_sha256":"3081f6a812eac4c976fab5e54485d23f224f3d503862230e26323476a15baafb","schema_version":"1.0","event_id":"sha256:3081f6a812eac4c976fab5e54485d23f224f3d503862230e26323476a15baafb"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH/bundle.json","state_url":"https://pith.science/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH/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":"2026-06-09T11:21:21Z","links":{"resolver":"https://pith.science/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH","bundle":"https://pith.science/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH/bundle.json","state":"https://pith.science/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/YCZUCY5JUF3YYX2CSMIPDNHGMH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:YCZUCY5JUF3YYX2CSMIPDNHGMH","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":"d4172f1d1d84177bd2edc5e1e930d18682d129d66c7b62ab7d8d2bbd2a547a2d","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-12T18:56:45Z","title_canon_sha256":"fcd5c1063523859d62a83bce6e0aa7c2f68e77da31cb6c356e1e76239981ef3a"},"schema_version":"1.0","source":{"id":"1602.04156","kind":"arxiv","version":4}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1602.04156","created_at":"2026-05-18T01:04:13Z"},{"alias_kind":"arxiv_version","alias_value":"1602.04156v4","created_at":"2026-05-18T01:04:13Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1602.04156","created_at":"2026-05-18T01:04:13Z"},{"alias_kind":"pith_short_12","alias_value":"YCZUCY5JUF3Y","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_16","alias_value":"YCZUCY5JUF3YYX2C","created_at":"2026-05-18T12:30:53Z"},{"alias_kind":"pith_short_8","alias_value":"YCZUCY5J","created_at":"2026-05-18T12:30:53Z"}],"graph_snapshots":[{"event_id":"sha256:3081f6a812eac4c976fab5e54485d23f224f3d503862230e26323476a15baafb","target":"graph","created_at":"2026-05-18T01:04:13Z","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 searched for an optical counterpart to the first gravitational wave source discovered by LIGO (GW150914), using a combination of the Pan-STARRS1 wide-field telescope and the PESSTO spectroscopic follow-up programme. As the final LIGO sky maps changed during analysis, the total probability of the source being spatially coincident with our fields was finally only 4.2 per cent. Therefore we discuss our results primarily as a demonstration of the survey capability of Pan-STARRS and spectroscopic capability of PESSTO. We mapped out 442 square degrees of the northern sky region of the initial map","authors_text":"A. Gal-Yam, A. Heinze, A. Mitra, A. Razza, A. Rest, A. S. B. Schultz, A. Sherstyuk, B. Gibson, B. Stalder, C. Baltay, C. Inserra, C. Waters, C. W. Stubbs, D. E. Wright, D. Rabinowitz, D. R. Young, E. A. Magnier, E. Cappellaro, E. Kankare, F. E Olivares, G. Terreran, H. Campbell, H. Flewelling, J. D. Lyman, J. Harmanen, J. P. Anderson, J. Sollerman, J. Tonry, K. C. Chambers, K. Maguire, K. W. Smith, L. Denneau, L. Galbany, L. Le Guillou, M. Coughlin, M. Della Valle, M. Dennefeld, M. E. Huber, M. Fraser, M. Nicholl, M. Smith, M. T. Botticella, M. Willman, N. Elias-Rosa, N. Primak, R. Kotak, S.J. Smartt, S. Valenti, T. Goggia, T. Kupfer, T.-W. Chen","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-12T18:56:45Z","title":"Pan-STARRS and PESSTO search for an optical counterpart to the LIGO gravitational wave source GW150914"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1602.04156","kind":"arxiv","version":4},"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":"sha256:2ff311592e48991c758296cbc31fe2f7aa01cf27d91ab83ed7e8053930bdbea7","target":"record","created_at":"2026-05-18T01:04:13Z","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":"d4172f1d1d84177bd2edc5e1e930d18682d129d66c7b62ab7d8d2bbd2a547a2d","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-02-12T18:56:45Z","title_canon_sha256":"fcd5c1063523859d62a83bce6e0aa7c2f68e77da31cb6c356e1e76239981ef3a"},"schema_version":"1.0","source":{"id":"1602.04156","kind":"arxiv","version":4}},"canonical_sha256":"c0b34163a9a1778c5f429310f1b4e661ee625084b0d7d9a1f6f8586c3d7415e1","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"c0b34163a9a1778c5f429310f1b4e661ee625084b0d7d9a1f6f8586c3d7415e1","first_computed_at":"2026-05-18T01:04:13.848783Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:04:13.848783Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"q93//c5lcpbxlcUfo/0fE678YGPJwu4Z6i9RNhisFBmmO3M5qvUWLsy1cJS4DeDJd4gAntCJzze8ycwVrHewBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:04:13.849181Z","signed_message":"canonical_sha256_bytes"},"source_id":"1602.04156","source_kind":"arxiv","source_version":4}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2ff311592e48991c758296cbc31fe2f7aa01cf27d91ab83ed7e8053930bdbea7","sha256:3081f6a812eac4c976fab5e54485d23f224f3d503862230e26323476a15baafb"],"state_sha256":"36a50d6420d4d4fc861fe3e189130366043b4816895012fb3f71a0bb4212219d"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AIoQC3uOAE6BdUH6YPSkufQyN1cucbuCNSA0CewM6osit+yM1keoKY6+S8kU74pRCFUsu+FPKJA8GmWXoBk0BA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-09T11:21:21.426701Z","bundle_sha256":"3a3d7b79c0296e4fb275456294feaf89d89e5cb96d5cb40d3c3d01efcae6dd88"}}