{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2019:W2SPFOWVVFUHUCIJV5TWBCHE4V","short_pith_number":"pith:W2SPFOWV","canonical_record":{"source":{"id":"1903.10014","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-24T16:32:58Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"96ed5b14c8f791917190bd9e8d08ab665e8535ccab6168b803ab3cec7c22daca","abstract_canon_sha256":"2545cd52317a22728b53e1cd3dfe69b0362d5b74b928d64ef50c1a1f7a82af77"},"schema_version":"1.0"},"canonical_sha256":"b6a4f2bad5a9687a0909af676088e4e558bbf34aa81110155445cfb4aff6690a","source":{"kind":"arxiv","id":"1903.10014","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.10014","created_at":"2026-05-17T23:50:34Z"},{"alias_kind":"arxiv_version","alias_value":"1903.10014v1","created_at":"2026-05-17T23:50:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.10014","created_at":"2026-05-17T23:50:34Z"},{"alias_kind":"pith_short_12","alias_value":"W2SPFOWVVFUH","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"W2SPFOWVVFUHUCIJ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"W2SPFOWV","created_at":"2026-05-18T12:33:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2019:W2SPFOWVVFUHUCIJV5TWBCHE4V","target":"record","payload":{"canonical_record":{"source":{"id":"1903.10014","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-24T16:32:58Z","cross_cats_sorted":["astro-ph.HE"],"title_canon_sha256":"96ed5b14c8f791917190bd9e8d08ab665e8535ccab6168b803ab3cec7c22daca","abstract_canon_sha256":"2545cd52317a22728b53e1cd3dfe69b0362d5b74b928d64ef50c1a1f7a82af77"},"schema_version":"1.0"},"canonical_sha256":"b6a4f2bad5a9687a0909af676088e4e558bbf34aa81110155445cfb4aff6690a","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:50:34.776627Z","signature_b64":"Hi0EwzOXCnR6M24NkBUccAQPclukaVuv+iDJyiMVImn7wl/u9YraWCLMFQjBXK+baDqZHe6E7E6vQkKI6DrOCg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"b6a4f2bad5a9687a0909af676088e4e558bbf34aa81110155445cfb4aff6690a","last_reissued_at":"2026-05-17T23:50:34.775999Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:50:34.775999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1903.10014","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":"2026-05-17T23:50:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"11PaPV6XqfOfsPHOenssFYjmg5B96jYSt48jFPTeC9S04EBYOwAuRAlfkkzzDAEiHi+FD83CHEwXDwvu5NCVCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:10:38.150467Z"},"content_sha256":"1d2f9ac1cd5fa92c58ec80791f300a668bbd58d5b738b74646c45d044cffba85","schema_version":"1.0","event_id":"sha256:1d2f9ac1cd5fa92c58ec80791f300a668bbd58d5b738b74646c45d044cffba85"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2019:W2SPFOWVVFUHUCIJV5TWBCHE4V","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. VII. Follow-up Campaign in the Southern Hemisphere","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.HE"],"primary_cat":"astro-ph.GA","authors_text":"\\'Alvarez Crespo, A. (UniTO), C. C. (NRL), Chavushyan, Cheung, Chomiuk, CONICET-UNLP, D'Abrusco, D. (SAO), E. J. (UniPL, E. (UNAM), F. (UniRoma TRE), F. (UniTO, G. (UniPG), H. A. (INAOE, H. A. (SAO), INAF/IASF Bo), INFN-TO), Jim\\'enez-Bail\\'on, J. (Michigan State Univ.), La Franca, Landoni, L. (Michigan State Univ.), Marchesini, Masetti, Massaro, M. (Brera Obs.), Milisavljevic, N. (INAF/IASF Bo, N. (UniTO, Paggi, Pe\\~na-Herazo, Ricci, R. (SAO), Smith, Strader, Tosti, UniTo, Universidad Andr\\'es Bello), V.(INAOE)","submitted_at":"2019-03-24T16:32:58Z","abstract_excerpt":"Searching for low energy counterparts of gamma-ray sources is one of the major challenges in modern gamma-ray astronomy. In the third Fermi source catalog about 30 % of detected sources are unidentified/unassociated Gamma-ray Sources (UGSs). We recently started an optical spectroscopic follow up campaign to confirm the blazar-like nature of candidates counterparts of UGSs. Here we report the spectra of 61 targets collected with the Southern Astrophysical Research Telescope (SOAR) between 2014 and the 2017. Our sample includes 33 potential counterparts of UGSs, selected on the basis of WISE col"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.10014","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":"2026-05-17T23:50:34Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"2/nEFSBGM+4GdrJ6Ch/JoYAN7fmdIHI1eSaJq7PBDk3hkuQ/O5mQJ2LssUBh8N0o/bB5C1cr8DM5eQboz/uSAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-26T22:10:38.150838Z"},"content_sha256":"1fc42139f9939332631d5b8494123c7f058ebe1aa5f19cfbafe3a209681f6171","schema_version":"1.0","event_id":"sha256:1fc42139f9939332631d5b8494123c7f058ebe1aa5f19cfbafe3a209681f6171"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V/bundle.json","state_url":"https://pith.science/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V/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":"2026-05-26T22:10:38Z","links":{"resolver":"https://pith.science/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V","bundle":"https://pith.science/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V/bundle.json","state":"https://pith.science/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V/state.json","well_known_bundle":"https://pith.science/.well-known/pith/W2SPFOWVVFUHUCIJV5TWBCHE4V/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2019:W2SPFOWVVFUHUCIJV5TWBCHE4V","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":"2545cd52317a22728b53e1cd3dfe69b0362d5b74b928d64ef50c1a1f7a82af77","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-24T16:32:58Z","title_canon_sha256":"96ed5b14c8f791917190bd9e8d08ab665e8535ccab6168b803ab3cec7c22daca"},"schema_version":"1.0","source":{"id":"1903.10014","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1903.10014","created_at":"2026-05-17T23:50:34Z"},{"alias_kind":"arxiv_version","alias_value":"1903.10014v1","created_at":"2026-05-17T23:50:34Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1903.10014","created_at":"2026-05-17T23:50:34Z"},{"alias_kind":"pith_short_12","alias_value":"W2SPFOWVVFUH","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_16","alias_value":"W2SPFOWVVFUHUCIJ","created_at":"2026-05-18T12:33:30Z"},{"alias_kind":"pith_short_8","alias_value":"W2SPFOWV","created_at":"2026-05-18T12:33:30Z"}],"graph_snapshots":[{"event_id":"sha256:1fc42139f9939332631d5b8494123c7f058ebe1aa5f19cfbafe3a209681f6171","target":"graph","created_at":"2026-05-17T23:50:34Z","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":"Searching for low energy counterparts of gamma-ray sources is one of the major challenges in modern gamma-ray astronomy. In the third Fermi source catalog about 30 % of detected sources are unidentified/unassociated Gamma-ray Sources (UGSs). We recently started an optical spectroscopic follow up campaign to confirm the blazar-like nature of candidates counterparts of UGSs. Here we report the spectra of 61 targets collected with the Southern Astrophysical Research Telescope (SOAR) between 2014 and the 2017. Our sample includes 33 potential counterparts of UGSs, selected on the basis of WISE col","authors_text":"\\'Alvarez Crespo, A. (UniTO), C. C. (NRL), Chavushyan, Cheung, Chomiuk, CONICET-UNLP, D'Abrusco, D. (SAO), E. J. (UniPL, E. (UNAM), F. (UniRoma TRE), F. (UniTO, G. (UniPG), H. A. (INAOE, H. A. (SAO), INAF/IASF Bo), INFN-TO), Jim\\'enez-Bail\\'on, J. (Michigan State Univ.), La Franca, Landoni, L. (Michigan State Univ.), Marchesini, Masetti, Massaro, M. (Brera Obs.), Milisavljevic, N. (INAF/IASF Bo, N. (UniTO, Paggi, Pe\\~na-Herazo, Ricci, R. (SAO), Smith, Strader, Tosti, UniTo, Universidad Andr\\'es Bello), V.(INAOE)","cross_cats":["astro-ph.HE"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-24T16:32:58Z","title":"Optical Spectroscopic Observations of Gamma-Ray Blazar Candidates. VII. Follow-up Campaign in the Southern Hemisphere"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1903.10014","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":"sha256:1d2f9ac1cd5fa92c58ec80791f300a668bbd58d5b738b74646c45d044cffba85","target":"record","created_at":"2026-05-17T23:50:34Z","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":"2545cd52317a22728b53e1cd3dfe69b0362d5b74b928d64ef50c1a1f7a82af77","cross_cats_sorted":["astro-ph.HE"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-03-24T16:32:58Z","title_canon_sha256":"96ed5b14c8f791917190bd9e8d08ab665e8535ccab6168b803ab3cec7c22daca"},"schema_version":"1.0","source":{"id":"1903.10014","kind":"arxiv","version":1}},"canonical_sha256":"b6a4f2bad5a9687a0909af676088e4e558bbf34aa81110155445cfb4aff6690a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"b6a4f2bad5a9687a0909af676088e4e558bbf34aa81110155445cfb4aff6690a","first_computed_at":"2026-05-17T23:50:34.775999Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:50:34.775999Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Hi0EwzOXCnR6M24NkBUccAQPclukaVuv+iDJyiMVImn7wl/u9YraWCLMFQjBXK+baDqZHe6E7E6vQkKI6DrOCg==","signature_status":"signed_v1","signed_at":"2026-05-17T23:50:34.776627Z","signed_message":"canonical_sha256_bytes"},"source_id":"1903.10014","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1d2f9ac1cd5fa92c58ec80791f300a668bbd58d5b738b74646c45d044cffba85","sha256:1fc42139f9939332631d5b8494123c7f058ebe1aa5f19cfbafe3a209681f6171"],"state_sha256":"68d585a5232bd7ac25012ccee1374afcf38bdcb8d58859eb4d6c700bcefd8aaf"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"HM9J4uZmnrUL9Q4z4ud9ofB10layFju1CWbbbgA1aISnl87uce8+BGjQoecSyYhV1usAUT4XgUJNnVfGcPe1Dw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-26T22:10:38.153531Z","bundle_sha256":"57036edafdb3a1f1a6ccc6c64d62af81e960f87accfd159d1db4ebde7373f20f"}}