{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:HKUJJLCSKV5WACT3KW4BQFJJEC","short_pith_number":"pith:HKUJJLCS","canonical_record":{"source":{"id":"1411.7401","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T21:28:53Z","cross_cats_sorted":[],"title_canon_sha256":"6ed22f9ad394871afbfde16acb60fd64bb8b8ff99ccfb2221b669d6b4f5d33f5","abstract_canon_sha256":"6981c88ac22ae5c241473000e7b12baed8a3831d785a0bbd29cb1371284f2a7d"},"schema_version":"1.0"},"canonical_sha256":"3aa894ac52557b600a7b55b81815292081c941913e8e46e6aebf34285e982bff","source":{"kind":"arxiv","id":"1411.7401","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.7401","created_at":"2026-05-18T02:28:39Z"},{"alias_kind":"arxiv_version","alias_value":"1411.7401v1","created_at":"2026-05-18T02:28:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.7401","created_at":"2026-05-18T02:28:39Z"},{"alias_kind":"pith_short_12","alias_value":"HKUJJLCSKV5W","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_16","alias_value":"HKUJJLCSKV5WACT3","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_8","alias_value":"HKUJJLCS","created_at":"2026-05-18T12:28:30Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:HKUJJLCSKV5WACT3KW4BQFJJEC","target":"record","payload":{"canonical_record":{"source":{"id":"1411.7401","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T21:28:53Z","cross_cats_sorted":[],"title_canon_sha256":"6ed22f9ad394871afbfde16acb60fd64bb8b8ff99ccfb2221b669d6b4f5d33f5","abstract_canon_sha256":"6981c88ac22ae5c241473000e7b12baed8a3831d785a0bbd29cb1371284f2a7d"},"schema_version":"1.0"},"canonical_sha256":"3aa894ac52557b600a7b55b81815292081c941913e8e46e6aebf34285e982bff","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:28:39.874506Z","signature_b64":"mJxtA57vOs3WCBTL6nY4fV8uR9aI8PZtugswZQFtBs2zwbF7vB63mmN3iAsZA7urWk/7SXDLnuIB93A7yl3IBA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"3aa894ac52557b600a7b55b81815292081c941913e8e46e6aebf34285e982bff","last_reissued_at":"2026-05-18T02:28:39.873829Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:28:39.873829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1411.7401","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":"2026-05-18T02:28:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"+sv/nXMAlqRuyaWsP/TPfjeBo1sd/X5fqaEXcG7stEZBMWsrwQWjsL/2BeQkKsWr+aO0FmFLeziEGGz6R5XVAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:04:10.226282Z"},"content_sha256":"621009d6a28cb88105a76f82483b9b33d5bd5cf54dfea754d59fd5dbfe5bfd6c","schema_version":"1.0","event_id":"sha256:621009d6a28cb88105a76f82483b9b33d5bd5cf54dfea754d59fd5dbfe5bfd6c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:HKUJJLCSKV5WACT3KW4BQFJJEC","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The Two-Colour EMCCD Instrument for the Danish 1.54m Telescope and SONG","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. N. S{\\o}rensen, D. M. Bramich, F. Grundahl, H. Kjeldsen, J. Christensen-Dalsgaard, Jesper Skottfelt, J. Southworth, K. B. W. Harps{\\o}e, M. F. Andersen, M. Hundertmark, M. I. Andersen, N. Michaelsen, P. Kj{\\ae}rgaard, P. L. Pall\\'e, S. Frandsen, U. G. J{\\o}rgensen","submitted_at":"2014-11-26T21:28:53Z","abstract_excerpt":"We report on the implemented design of a two-colour instrument based on electron multiplying CCD (EMCCD) detectors. This instrument is currently installed at the Danish 1.54m telescope at ESO's La Silla Observatory in Chile, and will be available at the SONG (Stellar Observations Network Group) 1m telescope node at Tenerife and at other SONG nodes as well. We present the software system for controlling the two-colour instrument and calibrating the high frame-rate imaging data delivered by the EMCCD cameras. An analysis of the performance of the Two-Colour Instrument at the Danish telescope sho"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.7401","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":"2026-05-18T02:28:39Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"4slGHTK63NnaO5LmRuZ95iAcOGJl3lGXpXXel8jLRhbs/lU4iuTjl9MfQtFPpcoBVuHkXiEyR9PltkskrfebAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-05T13:04:10.226639Z"},"content_sha256":"c1321db4640da93158d74397a86d1b03904e636802ba2a3d0c7b792734891a99","schema_version":"1.0","event_id":"sha256:c1321db4640da93158d74397a86d1b03904e636802ba2a3d0c7b792734891a99"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/HKUJJLCSKV5WACT3KW4BQFJJEC/bundle.json","state_url":"https://pith.science/pith/HKUJJLCSKV5WACT3KW4BQFJJEC/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/HKUJJLCSKV5WACT3KW4BQFJJEC/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":"2026-06-05T13:04:10Z","links":{"resolver":"https://pith.science/pith/HKUJJLCSKV5WACT3KW4BQFJJEC","bundle":"https://pith.science/pith/HKUJJLCSKV5WACT3KW4BQFJJEC/bundle.json","state":"https://pith.science/pith/HKUJJLCSKV5WACT3KW4BQFJJEC/state.json","well_known_bundle":"https://pith.science/.well-known/pith/HKUJJLCSKV5WACT3KW4BQFJJEC/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:HKUJJLCSKV5WACT3KW4BQFJJEC","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":"6981c88ac22ae5c241473000e7b12baed8a3831d785a0bbd29cb1371284f2a7d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T21:28:53Z","title_canon_sha256":"6ed22f9ad394871afbfde16acb60fd64bb8b8ff99ccfb2221b669d6b4f5d33f5"},"schema_version":"1.0","source":{"id":"1411.7401","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1411.7401","created_at":"2026-05-18T02:28:39Z"},{"alias_kind":"arxiv_version","alias_value":"1411.7401v1","created_at":"2026-05-18T02:28:39Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1411.7401","created_at":"2026-05-18T02:28:39Z"},{"alias_kind":"pith_short_12","alias_value":"HKUJJLCSKV5W","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_16","alias_value":"HKUJJLCSKV5WACT3","created_at":"2026-05-18T12:28:30Z"},{"alias_kind":"pith_short_8","alias_value":"HKUJJLCS","created_at":"2026-05-18T12:28:30Z"}],"graph_snapshots":[{"event_id":"sha256:c1321db4640da93158d74397a86d1b03904e636802ba2a3d0c7b792734891a99","target":"graph","created_at":"2026-05-18T02:28:39Z","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 report on the implemented design of a two-colour instrument based on electron multiplying CCD (EMCCD) detectors. This instrument is currently installed at the Danish 1.54m telescope at ESO's La Silla Observatory in Chile, and will be available at the SONG (Stellar Observations Network Group) 1m telescope node at Tenerife and at other SONG nodes as well. We present the software system for controlling the two-colour instrument and calibrating the high frame-rate imaging data delivered by the EMCCD cameras. An analysis of the performance of the Two-Colour Instrument at the Danish telescope sho","authors_text":"A. N. S{\\o}rensen, D. M. Bramich, F. Grundahl, H. Kjeldsen, J. Christensen-Dalsgaard, Jesper Skottfelt, J. Southworth, K. B. W. Harps{\\o}e, M. F. Andersen, M. Hundertmark, M. I. Andersen, N. Michaelsen, P. Kj{\\ae}rgaard, P. L. Pall\\'e, S. Frandsen, U. G. J{\\o}rgensen","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T21:28:53Z","title":"The Two-Colour EMCCD Instrument for the Danish 1.54m Telescope and SONG"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1411.7401","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":"sha256:621009d6a28cb88105a76f82483b9b33d5bd5cf54dfea754d59fd5dbfe5bfd6c","target":"record","created_at":"2026-05-18T02:28:39Z","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":"6981c88ac22ae5c241473000e7b12baed8a3831d785a0bbd29cb1371284f2a7d","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2014-11-26T21:28:53Z","title_canon_sha256":"6ed22f9ad394871afbfde16acb60fd64bb8b8ff99ccfb2221b669d6b4f5d33f5"},"schema_version":"1.0","source":{"id":"1411.7401","kind":"arxiv","version":1}},"canonical_sha256":"3aa894ac52557b600a7b55b81815292081c941913e8e46e6aebf34285e982bff","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3aa894ac52557b600a7b55b81815292081c941913e8e46e6aebf34285e982bff","first_computed_at":"2026-05-18T02:28:39.873829Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:28:39.873829Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"mJxtA57vOs3WCBTL6nY4fV8uR9aI8PZtugswZQFtBs2zwbF7vB63mmN3iAsZA7urWk/7SXDLnuIB93A7yl3IBA==","signature_status":"signed_v1","signed_at":"2026-05-18T02:28:39.874506Z","signed_message":"canonical_sha256_bytes"},"source_id":"1411.7401","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:621009d6a28cb88105a76f82483b9b33d5bd5cf54dfea754d59fd5dbfe5bfd6c","sha256:c1321db4640da93158d74397a86d1b03904e636802ba2a3d0c7b792734891a99"],"state_sha256":"fab18a70f2a3a0b78e2e2fc8bc02820d3e14a8a5c4b271f9e307775a04b3a2b8"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Rtv0m0ngPJKhCY+rWzdnffPjowhwZxEv6xJmtB5uTTjpr8EC2AGazywmS5WuAjgjbEWF8jWk4Pqwp9ZPsusgCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-05T13:04:10.228505Z","bundle_sha256":"d69acffa4b1163f0289d068d8476c7401ab545e8b58c5f67ec393e8295ac2cd9"}}