{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2026:SNKVGHVW3ZOW6ODHM7E7GD7PR3","short_pith_number":"pith:SNKVGHVW","canonical_record":{"source":{"id":"2606.17170","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-15T18:09:00Z","cross_cats_sorted":[],"title_canon_sha256":"49dff49c20f9ab9cf7de465f10a6381a6dab9b5f22b7cb6d80d69919bf16ce47","abstract_canon_sha256":"82b1f0931fbf6833a41cf17b44e1943045083572d4394309fc441ab5b84ce6b2"},"schema_version":"1.0"},"canonical_sha256":"9355531eb6de5d6f386767c9f30fef8ed4c341a85d1312ba01c9d00ac3c09f51","source":{"kind":"arxiv","id":"2606.17170","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.17170","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"arxiv_version","alias_value":"2606.17170v1","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.17170","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"pith_short_12","alias_value":"SNKVGHVW3ZOW","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"pith_short_16","alias_value":"SNKVGHVW3ZOW6ODH","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"pith_short_8","alias_value":"SNKVGHVW","created_at":"2026-06-19T16:10:04Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2026:SNKVGHVW3ZOW6ODHM7E7GD7PR3","target":"record","payload":{"canonical_record":{"source":{"id":"2606.17170","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-15T18:09:00Z","cross_cats_sorted":[],"title_canon_sha256":"49dff49c20f9ab9cf7de465f10a6381a6dab9b5f22b7cb6d80d69919bf16ce47","abstract_canon_sha256":"82b1f0931fbf6833a41cf17b44e1943045083572d4394309fc441ab5b84ce6b2"},"schema_version":"1.0"},"canonical_sha256":"9355531eb6de5d6f386767c9f30fef8ed4c341a85d1312ba01c9d00ac3c09f51","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-06-19T16:10:04.920536Z","signature_b64":"v6+tIVCCMbm40L2zJfyr7+JIqE/yUP+xAz9+EmzEpDpNmWmXrp6yVzuw9xKRS0GM+/WsF2sr3+BeonNw3YLpCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9355531eb6de5d6f386767c9f30fef8ed4c341a85d1312ba01c9d00ac3c09f51","last_reissued_at":"2026-06-19T16:10:04.920198Z","signature_status":"signed_v1","first_computed_at":"2026-06-19T16:10:04.920198Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"2606.17170","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":"2026-06-19T16:10:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"/XfnAb4+0FO6RLso37ryHQyke4cjb+QjpMOy7pYn1mebMEsDp1JwOkqxAmNpqEloAxkmJWWTq6sjCCGzJU5qCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T12:52:38.061012Z"},"content_sha256":"2b6c68d9b46d9f6cf425d131f5cccd053634338203f37bffd9608e8de51d9bf2","schema_version":"1.0","event_id":"sha256:2b6c68d9b46d9f6cf425d131f5cccd053634338203f37bffd9608e8de51d9bf2"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2026:SNKVGHVW3ZOW6ODHM7E7GD7PR3","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Discovery of a Supernova Following the Einstein Probe Transient EP250302a at z = 1.131","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Antonella Palmese, Brendan O'Connor, Daniel Gruen, Igor Andreoni, James Freeburn, Julius Gassert, Lei Hu, Malte Busmann, Noel Klingler, Xander J. Hall","submitted_at":"2026-06-15T18:09:00Z","abstract_excerpt":"We present a multi-wavelength analysis of the Einstein Probe (EP) fast X-ray transient (FXT) EP250302a located at redshift $z=1.131$. Despite its luminous prompt X-ray emission, the event was not detected in gamma-rays. Multi-wavelength follow-up identified a bright optical and X-ray source that displayed rapid chromatic flaring before returning to the standard decay of a gamma-ray burst afterglow. We interpret the chromatic flare as either due to a refreshed shock caused by a discrete shell collision or as reverse shock emission. Using the early optical data, we place constraints on the Loren"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.17170","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/2606.17170/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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":"2026-06-19T16:10:04Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"SmmrsYUlzePgKmAl+ONMepjSORpBn7r/Mtrt1hOOnplYuXWowxLBWcKNxLzQDFQZCuUt3rUaRNqy5R44sKSZAA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-27T12:52:38.061392Z"},"content_sha256":"b583c7d9e27d18be3f50da4f8efeeffe09493985f154fc156911567004116f36","schema_version":"1.0","event_id":"sha256:b583c7d9e27d18be3f50da4f8efeeffe09493985f154fc156911567004116f36"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3/bundle.json","state_url":"https://pith.science/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3/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":"2026-06-27T12:52:38Z","links":{"resolver":"https://pith.science/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3","bundle":"https://pith.science/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3/bundle.json","state":"https://pith.science/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3/state.json","well_known_bundle":"https://pith.science/.well-known/pith/SNKVGHVW3ZOW6ODHM7E7GD7PR3/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2026:SNKVGHVW3ZOW6ODHM7E7GD7PR3","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":"82b1f0931fbf6833a41cf17b44e1943045083572d4394309fc441ab5b84ce6b2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-15T18:09:00Z","title_canon_sha256":"49dff49c20f9ab9cf7de465f10a6381a6dab9b5f22b7cb6d80d69919bf16ce47"},"schema_version":"1.0","source":{"id":"2606.17170","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2606.17170","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"arxiv_version","alias_value":"2606.17170v1","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2606.17170","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"pith_short_12","alias_value":"SNKVGHVW3ZOW","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"pith_short_16","alias_value":"SNKVGHVW3ZOW6ODH","created_at":"2026-06-19T16:10:04Z"},{"alias_kind":"pith_short_8","alias_value":"SNKVGHVW","created_at":"2026-06-19T16:10:04Z"}],"graph_snapshots":[{"event_id":"sha256:b583c7d9e27d18be3f50da4f8efeeffe09493985f154fc156911567004116f36","target":"graph","created_at":"2026-06-19T16:10:04Z","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/2606.17170/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a multi-wavelength analysis of the Einstein Probe (EP) fast X-ray transient (FXT) EP250302a located at redshift $z=1.131$. Despite its luminous prompt X-ray emission, the event was not detected in gamma-rays. Multi-wavelength follow-up identified a bright optical and X-ray source that displayed rapid chromatic flaring before returning to the standard decay of a gamma-ray burst afterglow. We interpret the chromatic flare as either due to a refreshed shock caused by a discrete shell collision or as reverse shock emission. Using the early optical data, we place constraints on the Loren","authors_text":"Antonella Palmese, Brendan O'Connor, Daniel Gruen, Igor Andreoni, James Freeburn, Julius Gassert, Lei Hu, Malte Busmann, Noel Klingler, Xander J. Hall","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-15T18:09:00Z","title":"Discovery of a Supernova Following the Einstein Probe Transient EP250302a at z = 1.131"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2606.17170","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":"sha256:2b6c68d9b46d9f6cf425d131f5cccd053634338203f37bffd9608e8de51d9bf2","target":"record","created_at":"2026-06-19T16:10:04Z","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":"82b1f0931fbf6833a41cf17b44e1943045083572d4394309fc441ab5b84ce6b2","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2026-06-15T18:09:00Z","title_canon_sha256":"49dff49c20f9ab9cf7de465f10a6381a6dab9b5f22b7cb6d80d69919bf16ce47"},"schema_version":"1.0","source":{"id":"2606.17170","kind":"arxiv","version":1}},"canonical_sha256":"9355531eb6de5d6f386767c9f30fef8ed4c341a85d1312ba01c9d00ac3c09f51","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"9355531eb6de5d6f386767c9f30fef8ed4c341a85d1312ba01c9d00ac3c09f51","first_computed_at":"2026-06-19T16:10:04.920198Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-06-19T16:10:04.920198Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v6+tIVCCMbm40L2zJfyr7+JIqE/yUP+xAz9+EmzEpDpNmWmXrp6yVzuw9xKRS0GM+/WsF2sr3+BeonNw3YLpCw==","signature_status":"signed_v1","signed_at":"2026-06-19T16:10:04.920536Z","signed_message":"canonical_sha256_bytes"},"source_id":"2606.17170","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:2b6c68d9b46d9f6cf425d131f5cccd053634338203f37bffd9608e8de51d9bf2","sha256:b583c7d9e27d18be3f50da4f8efeeffe09493985f154fc156911567004116f36"],"state_sha256":"bb12e0da79867ce8abaeb32dc934399fb709b06f8000463e0b9d1ca99773218e"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mvtWJPem9KbsIE0w5bMEPNMQ8+tQkOdEx2S/Ll4o5SOkKq4nNawvCTI8evuFRs64hOv/ApsPLYgtBq+TZ1xICg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-27T12:52:38.063354Z","bundle_sha256":"95e046396d121421d055dd6e3f2faa73354fe7501b269cf123716604922c577b"}}