{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:P5VTX7QRKXJT65VBHSNJWFEC3Z","short_pith_number":"pith:P5VTX7QR","canonical_record":{"source":{"id":"1802.07820","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T21:43:39Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"9326f9e9b963e8304cb96f3c121c2f7d4828e167011f711089452350a0554c78","abstract_canon_sha256":"efc5a0bd7c8634cd0443cecaa381023803d5aaaec2cda0e5baea1b7de0b996b5"},"schema_version":"1.0"},"canonical_sha256":"7f6b3bfe1155d33f76a13c9a9b1482de6572676cb37d8584ad5ffb41d52d3480","source":{"kind":"arxiv","id":"1802.07820","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07820","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07820v1","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07820","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"pith_short_12","alias_value":"P5VTX7QRKXJT","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"P5VTX7QRKXJT65VB","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"P5VTX7QR","created_at":"2026-05-18T12:32:43Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:P5VTX7QRKXJT65VBHSNJWFEC3Z","target":"record","payload":{"canonical_record":{"source":{"id":"1802.07820","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T21:43:39Z","cross_cats_sorted":["astro-ph.SR"],"title_canon_sha256":"9326f9e9b963e8304cb96f3c121c2f7d4828e167011f711089452350a0554c78","abstract_canon_sha256":"efc5a0bd7c8634cd0443cecaa381023803d5aaaec2cda0e5baea1b7de0b996b5"},"schema_version":"1.0"},"canonical_sha256":"7f6b3bfe1155d33f76a13c9a9b1482de6572676cb37d8584ad5ffb41d52d3480","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:21:05.791860Z","signature_b64":"zPpZ6u+2AdjdNcDRjgkxxspkL2KhCEsOsGiFmIuHZpf7m16LV8CktT6/ZXS1W5ImVsFPRpN+fmrstNmXghm9AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"7f6b3bfe1155d33f76a13c9a9b1482de6572676cb37d8584ad5ffb41d52d3480","last_reissued_at":"2026-05-18T00:21:05.791362Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:21:05.791362Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1802.07820","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":"2026-05-18T00:21:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Tx3m0znpHyfjAA5sSdBudz17TUGm6s12qK0I9eU55pwbySF583eJTT+dX4kkpji8Kzf5yHIjUtv7SidDWGXECg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T03:24:41.241839Z"},"content_sha256":"2d11364ecc0f8bcfde69ebd08ceadb0658473315f7b0beb64c790f382e0f68dc","schema_version":"1.0","event_id":"sha256:2d11364ecc0f8bcfde69ebd08ceadb0658473315f7b0beb64c790f382e0f68dc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:P5VTX7QRKXJT65VBHSNJWFEC3Z","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spectra of Hydrogen-Poor Superluminous Supernovae from the Palomar Transient Factory","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.SR"],"primary_cat":"astro-ph.HE","authors_text":"Alexei V. Filippenko, Annalisa De Cia, Assaf Sternberg, Avishay Gal-Yam, Daniel A. Perley, Giorgos Leloudas, Io K. W. Kleiser, Jeff Cooke, Jeffrey M. Silverman, Joshua S. Bloom, Lin Yan, Mansi M. Kasliwal, Mark Sullivan, Ofer Yaron, Paul M. Vreeswijk, Peter E. Nugent, Ragnhild Lunnan, Richard Ellis, Robert M. Quimby, S. Bradley Cenko, Shrinivas R. Kulkarni, Thomas Matheson, Yen-Chen Pan","submitted_at":"2018-02-21T21:43:39Z","abstract_excerpt":"Most Type I superluminous supernovae (SLSNe-I) reported to date have been identified by their high peak luminosities and spectra lacking obvious signs of hydrogen. We demonstrate that these events can be distinguished from normal-luminosity SNe (including Type Ic events) solely from their spectra over a wide range of light-curve phases. We use this distinction to select 19 SLSNe-I and 4 possible SLSNe-I from the Palomar Transient Factory archive (including 7 previously published objects). We present 127 new spectra of these objects and combine these with 39 previously published spectra, and we"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07820","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":"2026-05-18T00:21:05Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"bniapQSKaSJzYpWdSsbPF8rxaFrnb8vkVViO3HMOXjY3yIIVFJcpL869DRRFy45gvN/MSK7CaJW1LOedhrscAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-28T03:24:41.242195Z"},"content_sha256":"6a6496a9e0d160bc855a0c3bfdbba85e1638fb678c6fc597e91a1afb0e3000d7","schema_version":"1.0","event_id":"sha256:6a6496a9e0d160bc855a0c3bfdbba85e1638fb678c6fc597e91a1afb0e3000d7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z/bundle.json","state_url":"https://pith.science/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z/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":"2026-05-28T03:24:41Z","links":{"resolver":"https://pith.science/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z","bundle":"https://pith.science/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z/bundle.json","state":"https://pith.science/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z/state.json","well_known_bundle":"https://pith.science/.well-known/pith/P5VTX7QRKXJT65VBHSNJWFEC3Z/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:P5VTX7QRKXJT65VBHSNJWFEC3Z","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":"efc5a0bd7c8634cd0443cecaa381023803d5aaaec2cda0e5baea1b7de0b996b5","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T21:43:39Z","title_canon_sha256":"9326f9e9b963e8304cb96f3c121c2f7d4828e167011f711089452350a0554c78"},"schema_version":"1.0","source":{"id":"1802.07820","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1802.07820","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"arxiv_version","alias_value":"1802.07820v1","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1802.07820","created_at":"2026-05-18T00:21:05Z"},{"alias_kind":"pith_short_12","alias_value":"P5VTX7QRKXJT","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_16","alias_value":"P5VTX7QRKXJT65VB","created_at":"2026-05-18T12:32:43Z"},{"alias_kind":"pith_short_8","alias_value":"P5VTX7QR","created_at":"2026-05-18T12:32:43Z"}],"graph_snapshots":[{"event_id":"sha256:6a6496a9e0d160bc855a0c3bfdbba85e1638fb678c6fc597e91a1afb0e3000d7","target":"graph","created_at":"2026-05-18T00:21:05Z","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":"Most Type I superluminous supernovae (SLSNe-I) reported to date have been identified by their high peak luminosities and spectra lacking obvious signs of hydrogen. We demonstrate that these events can be distinguished from normal-luminosity SNe (including Type Ic events) solely from their spectra over a wide range of light-curve phases. We use this distinction to select 19 SLSNe-I and 4 possible SLSNe-I from the Palomar Transient Factory archive (including 7 previously published objects). We present 127 new spectra of these objects and combine these with 39 previously published spectra, and we","authors_text":"Alexei V. Filippenko, Annalisa De Cia, Assaf Sternberg, Avishay Gal-Yam, Daniel A. Perley, Giorgos Leloudas, Io K. W. Kleiser, Jeff Cooke, Jeffrey M. Silverman, Joshua S. Bloom, Lin Yan, Mansi M. Kasliwal, Mark Sullivan, Ofer Yaron, Paul M. Vreeswijk, Peter E. Nugent, Ragnhild Lunnan, Richard Ellis, Robert M. Quimby, S. Bradley Cenko, Shrinivas R. Kulkarni, Thomas Matheson, Yen-Chen Pan","cross_cats":["astro-ph.SR"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T21:43:39Z","title":"Spectra of Hydrogen-Poor Superluminous Supernovae from the Palomar Transient Factory"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1802.07820","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":"sha256:2d11364ecc0f8bcfde69ebd08ceadb0658473315f7b0beb64c790f382e0f68dc","target":"record","created_at":"2026-05-18T00:21:05Z","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":"efc5a0bd7c8634cd0443cecaa381023803d5aaaec2cda0e5baea1b7de0b996b5","cross_cats_sorted":["astro-ph.SR"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2018-02-21T21:43:39Z","title_canon_sha256":"9326f9e9b963e8304cb96f3c121c2f7d4828e167011f711089452350a0554c78"},"schema_version":"1.0","source":{"id":"1802.07820","kind":"arxiv","version":1}},"canonical_sha256":"7f6b3bfe1155d33f76a13c9a9b1482de6572676cb37d8584ad5ffb41d52d3480","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"7f6b3bfe1155d33f76a13c9a9b1482de6572676cb37d8584ad5ffb41d52d3480","first_computed_at":"2026-05-18T00:21:05.791362Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:21:05.791362Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"zPpZ6u+2AdjdNcDRjgkxxspkL2KhCEsOsGiFmIuHZpf7m16LV8CktT6/ZXS1W5ImVsFPRpN+fmrstNmXghm9AQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:21:05.791860Z","signed_message":"canonical_sha256_bytes"},"source_id":"1802.07820","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2d11364ecc0f8bcfde69ebd08ceadb0658473315f7b0beb64c790f382e0f68dc","sha256:6a6496a9e0d160bc855a0c3bfdbba85e1638fb678c6fc597e91a1afb0e3000d7"],"state_sha256":"868e8c4f8bc0f3bb6a8b6723338fc22b7c6898cd470db0f514b9e16bda4f1d06"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"H1atdNfW7OHcQCZUVwZ5Xp9bBFHK7pzpvV+n1tFLa771MevpnInBtNvwFTGKr1i3f8xoMcFKftDXa3Y2EgE7Cg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-28T03:24:41.244170Z","bundle_sha256":"a8b7d5825c0249de9bcfbaf3639d55d8bff6a56a36ba46e04d98c79df1ca6f45"}}