{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2015:EFR3LEWKT3YAN5UNNDCWYGEERK","short_pith_number":"pith:EFR3LEWK","canonical_record":{"source":{"id":"1506.08252","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-27T03:44:19Z","cross_cats_sorted":[],"title_canon_sha256":"4b04ba854787665d1b1c251b0fe7a0d7ca14a42a59026a4510cc83802efedde9","abstract_canon_sha256":"e555f69d3352aeaca37a41a40feeae25a6b38716d93011b40f88c337adb830b3"},"schema_version":"1.0"},"canonical_sha256":"2163b592ca9ef006f68d68c56c18848a97b873a5fe4c919324ff04bbe2655fef","source":{"kind":"arxiv","id":"1506.08252","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.08252","created_at":"2026-05-18T01:37:46Z"},{"alias_kind":"arxiv_version","alias_value":"1506.08252v1","created_at":"2026-05-18T01:37:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.08252","created_at":"2026-05-18T01:37:46Z"},{"alias_kind":"pith_short_12","alias_value":"EFR3LEWKT3YA","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EFR3LEWKT3YAN5UN","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EFR3LEWK","created_at":"2026-05-18T12:29:19Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2015:EFR3LEWKT3YAN5UNNDCWYGEERK","target":"record","payload":{"canonical_record":{"source":{"id":"1506.08252","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-27T03:44:19Z","cross_cats_sorted":[],"title_canon_sha256":"4b04ba854787665d1b1c251b0fe7a0d7ca14a42a59026a4510cc83802efedde9","abstract_canon_sha256":"e555f69d3352aeaca37a41a40feeae25a6b38716d93011b40f88c337adb830b3"},"schema_version":"1.0"},"canonical_sha256":"2163b592ca9ef006f68d68c56c18848a97b873a5fe4c919324ff04bbe2655fef","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:37:46.927291Z","signature_b64":"n590WlcdPnM5nIYVrKMxHcVQ2yzf2BhoWCPiZwg1Inj0WNAS/2h0HuK/IxtTfne+90XntzTSGhnOduv7zfQdBQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"2163b592ca9ef006f68d68c56c18848a97b873a5fe4c919324ff04bbe2655fef","last_reissued_at":"2026-05-18T01:37:46.926906Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:37:46.926906Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1506.08252","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":"2026-05-18T01:37:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"UQM/n7Hj8mXkJpINC2RR2COPXlCk8o3sv3ChY/wglh3cfH3WMsvEQ92U5dXBoXt1mQjKh36Vt6LptYe9o7T5Aw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:46:02.317684Z"},"content_sha256":"72e06b0f2d08caf20877918aeae1aea8022e0a52e3c9dbbbf16d96f485f5d607","schema_version":"1.0","event_id":"sha256:72e06b0f2d08caf20877918aeae1aea8022e0a52e3c9dbbbf16d96f485f5d607"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2015:EFR3LEWKT3YAN5UNNDCWYGEERK","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"A beam-displacement prism based, three band stellar photo-polarimeter","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.IM","authors_text":"A. V. Raveendran, G. Srinivasulu, K. Jayakumar, K. Sagayanathan, M. J. Rosario, M. R. Somashekar, M. V. Mekkaden, N. Jayavel, S. Muneer, S. Ramamoorthy","submitted_at":"2015-06-27T03:44:19Z","abstract_excerpt":"A new astronomical photo-polarimeter that can measure linear polarization of point sources simultaneously in three spectral bands was designed and built in Indian Institute of Astrophysics. The polarimeter has a Calcite beam-displacement prism as the analyzer. The ordinary and extra-ordinary emerging beams in each spectral band are quasi-simultaneously detected by the same photomultiplier by using a high speed rotating chopper. The effective chopping frequency can be set to as high as 200 Hz. A rotating superachromatic Pancharatnam halfwave plate is used to modulate the light incident on the a"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.08252","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":"2026-05-18T01:37:46Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"z9LYF2QHjKW+u1xCIfVFt60oQqmW4mEwd5XD42QWl8u31XmE6v7wm7FIVLvPuR8isbwOpUHYHU5Z8aaC0d/dCg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-25T20:46:02.318347Z"},"content_sha256":"cf1bbced08f6efedaf1b4b2344e344e28649271435041bc5f4e6dc00710f478d","schema_version":"1.0","event_id":"sha256:cf1bbced08f6efedaf1b4b2344e344e28649271435041bc5f4e6dc00710f478d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/EFR3LEWKT3YAN5UNNDCWYGEERK/bundle.json","state_url":"https://pith.science/pith/EFR3LEWKT3YAN5UNNDCWYGEERK/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/EFR3LEWKT3YAN5UNNDCWYGEERK/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":"2026-05-25T20:46:02Z","links":{"resolver":"https://pith.science/pith/EFR3LEWKT3YAN5UNNDCWYGEERK","bundle":"https://pith.science/pith/EFR3LEWKT3YAN5UNNDCWYGEERK/bundle.json","state":"https://pith.science/pith/EFR3LEWKT3YAN5UNNDCWYGEERK/state.json","well_known_bundle":"https://pith.science/.well-known/pith/EFR3LEWKT3YAN5UNNDCWYGEERK/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2015:EFR3LEWKT3YAN5UNNDCWYGEERK","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":"e555f69d3352aeaca37a41a40feeae25a6b38716d93011b40f88c337adb830b3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-27T03:44:19Z","title_canon_sha256":"4b04ba854787665d1b1c251b0fe7a0d7ca14a42a59026a4510cc83802efedde9"},"schema_version":"1.0","source":{"id":"1506.08252","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1506.08252","created_at":"2026-05-18T01:37:46Z"},{"alias_kind":"arxiv_version","alias_value":"1506.08252v1","created_at":"2026-05-18T01:37:46Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1506.08252","created_at":"2026-05-18T01:37:46Z"},{"alias_kind":"pith_short_12","alias_value":"EFR3LEWKT3YA","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_16","alias_value":"EFR3LEWKT3YAN5UN","created_at":"2026-05-18T12:29:19Z"},{"alias_kind":"pith_short_8","alias_value":"EFR3LEWK","created_at":"2026-05-18T12:29:19Z"}],"graph_snapshots":[{"event_id":"sha256:cf1bbced08f6efedaf1b4b2344e344e28649271435041bc5f4e6dc00710f478d","target":"graph","created_at":"2026-05-18T01:37:46Z","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":"A new astronomical photo-polarimeter that can measure linear polarization of point sources simultaneously in three spectral bands was designed and built in Indian Institute of Astrophysics. The polarimeter has a Calcite beam-displacement prism as the analyzer. The ordinary and extra-ordinary emerging beams in each spectral band are quasi-simultaneously detected by the same photomultiplier by using a high speed rotating chopper. The effective chopping frequency can be set to as high as 200 Hz. A rotating superachromatic Pancharatnam halfwave plate is used to modulate the light incident on the a","authors_text":"A. V. Raveendran, G. Srinivasulu, K. Jayakumar, K. Sagayanathan, M. J. Rosario, M. R. Somashekar, M. V. Mekkaden, N. Jayavel, S. Muneer, S. Ramamoorthy","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-27T03:44:19Z","title":"A beam-displacement prism based, three band stellar photo-polarimeter"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1506.08252","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":"sha256:72e06b0f2d08caf20877918aeae1aea8022e0a52e3c9dbbbf16d96f485f5d607","target":"record","created_at":"2026-05-18T01:37:46Z","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":"e555f69d3352aeaca37a41a40feeae25a6b38716d93011b40f88c337adb830b3","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2015-06-27T03:44:19Z","title_canon_sha256":"4b04ba854787665d1b1c251b0fe7a0d7ca14a42a59026a4510cc83802efedde9"},"schema_version":"1.0","source":{"id":"1506.08252","kind":"arxiv","version":1}},"canonical_sha256":"2163b592ca9ef006f68d68c56c18848a97b873a5fe4c919324ff04bbe2655fef","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2163b592ca9ef006f68d68c56c18848a97b873a5fe4c919324ff04bbe2655fef","first_computed_at":"2026-05-18T01:37:46.926906Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:37:46.926906Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"n590WlcdPnM5nIYVrKMxHcVQ2yzf2BhoWCPiZwg1Inj0WNAS/2h0HuK/IxtTfne+90XntzTSGhnOduv7zfQdBQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:37:46.927291Z","signed_message":"canonical_sha256_bytes"},"source_id":"1506.08252","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:72e06b0f2d08caf20877918aeae1aea8022e0a52e3c9dbbbf16d96f485f5d607","sha256:cf1bbced08f6efedaf1b4b2344e344e28649271435041bc5f4e6dc00710f478d"],"state_sha256":"d360129ef95c7be3306d90726e01bcff269b6229918bf13fcf006ed04a6eb274"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"V1qn5UzqslzA7+ivYAqQGn4ERDcLKaCWxn5WkUjsoO4LwR/6Qvl9A6+AvB4JCyeVNMAqNX4LZnJoc2vMXaibBA==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-25T20:46:02.321839Z","bundle_sha256":"f6a4dca75ae38e0286d12330a00abf97930f62856a5eae4d6d432b29996ab2d0"}}