{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2013:TKTKJZHW5EX5BSLCT5CLWQSAX6","short_pith_number":"pith:TKTKJZHW","canonical_record":{"source":{"id":"1311.3304","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-13T21:00:07Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"610bdf5398e0fe9666f05ab91f5ac6f2793a5a954dd74b47f7c77d8bd13f7c03","abstract_canon_sha256":"142a56c8fce8026adab1a557ade984edc5684bd67577cbbc1bd997cd8e04bed1"},"schema_version":"1.0"},"canonical_sha256":"9aa6a4e4f6e92fd0c9629f44bb4240bf92ff9c1f2f8bf8b6afc59f2f149204d8","source":{"kind":"arxiv","id":"1311.3304","version":2},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.3304","created_at":"2026-05-18T01:46:31Z"},{"alias_kind":"arxiv_version","alias_value":"1311.3304v2","created_at":"2026-05-18T01:46:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.3304","created_at":"2026-05-18T01:46:31Z"},{"alias_kind":"pith_short_12","alias_value":"TKTKJZHW5EX5","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"TKTKJZHW5EX5BSLC","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"TKTKJZHW","created_at":"2026-05-18T12:28:02Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2013:TKTKJZHW5EX5BSLCT5CLWQSAX6","target":"record","payload":{"canonical_record":{"source":{"id":"1311.3304","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-13T21:00:07Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"610bdf5398e0fe9666f05ab91f5ac6f2793a5a954dd74b47f7c77d8bd13f7c03","abstract_canon_sha256":"142a56c8fce8026adab1a557ade984edc5684bd67577cbbc1bd997cd8e04bed1"},"schema_version":"1.0"},"canonical_sha256":"9aa6a4e4f6e92fd0c9629f44bb4240bf92ff9c1f2f8bf8b6afc59f2f149204d8","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:46:31.335391Z","signature_b64":"oUCUTBkdzqphTCiTS6eFUNwn5cTofuYstIbY/uVkbCPxQa0b0SB1I+nGKiS7/uVKjo6DjKoGq3wQiEhpaNMXAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9aa6a4e4f6e92fd0c9629f44bb4240bf92ff9c1f2f8bf8b6afc59f2f149204d8","last_reissued_at":"2026-05-18T01:46:31.334912Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:46:31.334912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1311.3304","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":"2026-05-18T01:46:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"zz35mOpeFN/+ChSBkd5DzRrsMxb0Ikp6/c+hEBFcHbLloMUK/TzV0fQY/IZ/sqpC4/fnTSOccvwT+c6JL0MlDA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:47:49.288539Z"},"content_sha256":"5aa7ab3ddaa80a80f97eb2222364f7cf9e9dc90474ebd16e3a7ba54b24b63c97","schema_version":"1.0","event_id":"sha256:5aa7ab3ddaa80a80f97eb2222364f7cf9e9dc90474ebd16e3a7ba54b24b63c97"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2013:TKTKJZHW5EX5BSLCT5CLWQSAX6","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The RoboPol optical polarization survey of gamma-ray - loud blazars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.HE","authors_text":"A.C.S. Readhead, A. Kus, A. Ramaprakash, B. Pazderska, C. Rajarshi, D. Blinov, D. Modi, E. Angelakis, E. Paleologou, E. Pazderski, G. Panopoulou, I. Myserlis, I. Papadakis, I. Papamastorakis, J.A. Zensus, K. Tassis, L. Fuhrmann, M. Balokovi\\'c, N. Kylafis, O.G. King, P. Khodade, P. Reig, R. Feiler, T. Hovatta, T.J. Pearson, V. Pavlidou","submitted_at":"2013-11-13T21:00:07Z","abstract_excerpt":"We present first results from RoboPol, a novel-design optical polarimeter operating at the Skinakas Observatory in Crete. The data, taken during the May - June 2013 commissioning of the instrument, constitute a single-epoch linear polarization survey of a sample of gamma-ray - loud blazars, defined according to unbiased and objective selection criteria, easily reproducible in simulations, as well as a comparison sample of, otherwise similar, gamma-ray - quiet blazars. As such, the results of this survey are appropriate for both phenomenological population studies and for tests of theoretical p"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.3304","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":"2026-05-18T01:46:31Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"QrOyU8mHl2qRp7aFsoTGlaTRs+HDWRHWh5/Z0qcHS13F6bTNu2U1oME1HwOp05Vt51znWI5l1KrB5qi/rwizBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T02:47:49.289180Z"},"content_sha256":"c2b4f9b2c89664984579c38fa44e672b6ce4e80163eb10e20bfbdb8eb8c2186e","schema_version":"1.0","event_id":"sha256:c2b4f9b2c89664984579c38fa44e672b6ce4e80163eb10e20bfbdb8eb8c2186e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6/bundle.json","state_url":"https://pith.science/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6/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":"2026-05-26T02:47:49Z","links":{"resolver":"https://pith.science/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6","bundle":"https://pith.science/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6/bundle.json","state":"https://pith.science/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6/state.json","well_known_bundle":"https://pith.science/.well-known/pith/TKTKJZHW5EX5BSLCT5CLWQSAX6/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2013:TKTKJZHW5EX5BSLCT5CLWQSAX6","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":"142a56c8fce8026adab1a557ade984edc5684bd67577cbbc1bd997cd8e04bed1","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-13T21:00:07Z","title_canon_sha256":"610bdf5398e0fe9666f05ab91f5ac6f2793a5a954dd74b47f7c77d8bd13f7c03"},"schema_version":"1.0","source":{"id":"1311.3304","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1311.3304","created_at":"2026-05-18T01:46:31Z"},{"alias_kind":"arxiv_version","alias_value":"1311.3304v2","created_at":"2026-05-18T01:46:31Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1311.3304","created_at":"2026-05-18T01:46:31Z"},{"alias_kind":"pith_short_12","alias_value":"TKTKJZHW5EX5","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_16","alias_value":"TKTKJZHW5EX5BSLC","created_at":"2026-05-18T12:28:02Z"},{"alias_kind":"pith_short_8","alias_value":"TKTKJZHW","created_at":"2026-05-18T12:28:02Z"}],"graph_snapshots":[{"event_id":"sha256:c2b4f9b2c89664984579c38fa44e672b6ce4e80163eb10e20bfbdb8eb8c2186e","target":"graph","created_at":"2026-05-18T01:46:31Z","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":"We present first results from RoboPol, a novel-design optical polarimeter operating at the Skinakas Observatory in Crete. The data, taken during the May - June 2013 commissioning of the instrument, constitute a single-epoch linear polarization survey of a sample of gamma-ray - loud blazars, defined according to unbiased and objective selection criteria, easily reproducible in simulations, as well as a comparison sample of, otherwise similar, gamma-ray - quiet blazars. As such, the results of this survey are appropriate for both phenomenological population studies and for tests of theoretical p","authors_text":"A.C.S. Readhead, A. Kus, A. Ramaprakash, B. Pazderska, C. Rajarshi, D. Blinov, D. Modi, E. Angelakis, E. Paleologou, E. Pazderski, G. Panopoulou, I. Myserlis, I. Papadakis, I. Papamastorakis, J.A. Zensus, K. Tassis, L. Fuhrmann, M. Balokovi\\'c, N. Kylafis, O.G. King, P. Khodade, P. Reig, R. Feiler, T. Hovatta, T.J. Pearson, V. Pavlidou","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-13T21:00:07Z","title":"The RoboPol optical polarization survey of gamma-ray - loud blazars"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1311.3304","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":"sha256:5aa7ab3ddaa80a80f97eb2222364f7cf9e9dc90474ebd16e3a7ba54b24b63c97","target":"record","created_at":"2026-05-18T01:46:31Z","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":"142a56c8fce8026adab1a557ade984edc5684bd67577cbbc1bd997cd8e04bed1","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2013-11-13T21:00:07Z","title_canon_sha256":"610bdf5398e0fe9666f05ab91f5ac6f2793a5a954dd74b47f7c77d8bd13f7c03"},"schema_version":"1.0","source":{"id":"1311.3304","kind":"arxiv","version":2}},"canonical_sha256":"9aa6a4e4f6e92fd0c9629f44bb4240bf92ff9c1f2f8bf8b6afc59f2f149204d8","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9aa6a4e4f6e92fd0c9629f44bb4240bf92ff9c1f2f8bf8b6afc59f2f149204d8","first_computed_at":"2026-05-18T01:46:31.334912Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:46:31.334912Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"oUCUTBkdzqphTCiTS6eFUNwn5cTofuYstIbY/uVkbCPxQa0b0SB1I+nGKiS7/uVKjo6DjKoGq3wQiEhpaNMXAA==","signature_status":"signed_v1","signed_at":"2026-05-18T01:46:31.335391Z","signed_message":"canonical_sha256_bytes"},"source_id":"1311.3304","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5aa7ab3ddaa80a80f97eb2222364f7cf9e9dc90474ebd16e3a7ba54b24b63c97","sha256:c2b4f9b2c89664984579c38fa44e672b6ce4e80163eb10e20bfbdb8eb8c2186e"],"state_sha256":"10d052df9428ee32a2cf5bd6c9f6d38788445b93637ec0bd1fa8ff603d64f04c"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"i032aOXeUMUjy/tJlmUpxjNcWF78s0BbPvlJ7MNd3RjmXR2zbJA0sEb9g9LQEJ895yRF4yx/8KYvu6n+27/9Cw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T02:47:49.292090Z","bundle_sha256":"6beae41e358909113e3b4d0a775192b8a7540bc1fe6c43af7aaa679cbdd1c60e"}}