{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2014:4Y4MXW22KMBG562CAY3VKBWJOF","short_pith_number":"pith:4Y4MXW22","canonical_record":{"source":{"id":"1408.1951","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-08T19:57:43Z","cross_cats_sorted":[],"title_canon_sha256":"e763c13d11749f0a9d943c2cf236f5ca742baaad24f8a97f970b64caa8722a41","abstract_canon_sha256":"cd9369783b87aacc57eec9e4f241de555c8f2d15641c5ded95aa04a6db885791"},"schema_version":"1.0"},"canonical_sha256":"e638cbdb5a53026efb4206375506c97171a4aecb2a504a85812ed7d4e64472c0","source":{"kind":"arxiv","id":"1408.1951","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.1951","created_at":"2026-05-18T01:42:22Z"},{"alias_kind":"arxiv_version","alias_value":"1408.1951v1","created_at":"2026-05-18T01:42:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.1951","created_at":"2026-05-18T01:42:22Z"},{"alias_kind":"pith_short_12","alias_value":"4Y4MXW22KMBG","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"4Y4MXW22KMBG562C","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"4Y4MXW22","created_at":"2026-05-18T12:28:14Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2014:4Y4MXW22KMBG562CAY3VKBWJOF","target":"record","payload":{"canonical_record":{"source":{"id":"1408.1951","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-08T19:57:43Z","cross_cats_sorted":[],"title_canon_sha256":"e763c13d11749f0a9d943c2cf236f5ca742baaad24f8a97f970b64caa8722a41","abstract_canon_sha256":"cd9369783b87aacc57eec9e4f241de555c8f2d15641c5ded95aa04a6db885791"},"schema_version":"1.0"},"canonical_sha256":"e638cbdb5a53026efb4206375506c97171a4aecb2a504a85812ed7d4e64472c0","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:22.375504Z","signature_b64":"cYXtIe/TV00bxDoaDdmY9WIgYAyizdktH1z6JUrSB27IZuQNk97xhIYWnz7mVJq/V4JJycjmwn1xZza9KlhvBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e638cbdb5a53026efb4206375506c97171a4aecb2a504a85812ed7d4e64472c0","last_reissued_at":"2026-05-18T01:42:22.375019Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:22.375019Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1408.1951","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":"2026-05-18T01:42:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rWBDEM3ZoIvO+IMNKHIFmkTN/DmUSs5CXl8xOxqQcsaNeL3jtsgG5w3VUfwfagzax3kYpyn8PZtObiZcKIp7Bg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T17:59:17.778424Z"},"content_sha256":"d196fde6ac70f1d7f1ad567cb65b86c60dbecf4b3678db68011a45610b3fd82a","schema_version":"1.0","event_id":"sha256:d196fde6ac70f1d7f1ad567cb65b86c60dbecf4b3678db68011a45610b3fd82a"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2014:4Y4MXW22KMBG562CAY3VKBWJOF","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Spitzer/IRAC Observations of the Variability of Sgr A* and the Object G2 at 4.5 microns","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"A. Ghez, E. E. Becklin, G. G. Fazio, G. Witzel, H. A. Smith, J. Ingalls, J. L. Hora, L. Meyer, M. L. N. Ashby, M. R. Morris, S. Carey, S. P. Willner","submitted_at":"2014-08-08T19:57:43Z","abstract_excerpt":"We present the first detection from the Spitzer Space Telescope of 4.5 micron variability from Sgr A*, the emitting source associated with the Milky Way's central black hole. The >23 hour continuous light curve was obtained with the IRAC instrument in 2013 December. The result characterizes the variability of Sgr A* prior to the closest approach of the G2 object, a putative infalling gas cloud that orbits close to Sgr A*. The high stellar density at the location of Sgr A* produces a background of ~250 mJy at 4.5 microns in each pixel with a large pixel-to-pixel gradient, but the light curve fo"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.1951","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":"2026-05-18T01:42:22Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"BMtsEdq2es8aL4zaZviffSs96xHizlduiVTzgdHQR1QeprHetjIFeHuVL8lmuXWzMVLvh7pulTAJRy74WVXmBQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-18T17:59:17.779097Z"},"content_sha256":"e78505461d8f68aaf55d4caa9bc8f18036c50e7145dfadf559327d2687a69428","schema_version":"1.0","event_id":"sha256:e78505461d8f68aaf55d4caa9bc8f18036c50e7145dfadf559327d2687a69428"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4Y4MXW22KMBG562CAY3VKBWJOF/bundle.json","state_url":"https://pith.science/pith/4Y4MXW22KMBG562CAY3VKBWJOF/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4Y4MXW22KMBG562CAY3VKBWJOF/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":"2026-05-18T17:59:17Z","links":{"resolver":"https://pith.science/pith/4Y4MXW22KMBG562CAY3VKBWJOF","bundle":"https://pith.science/pith/4Y4MXW22KMBG562CAY3VKBWJOF/bundle.json","state":"https://pith.science/pith/4Y4MXW22KMBG562CAY3VKBWJOF/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4Y4MXW22KMBG562CAY3VKBWJOF/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:4Y4MXW22KMBG562CAY3VKBWJOF","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":"cd9369783b87aacc57eec9e4f241de555c8f2d15641c5ded95aa04a6db885791","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-08T19:57:43Z","title_canon_sha256":"e763c13d11749f0a9d943c2cf236f5ca742baaad24f8a97f970b64caa8722a41"},"schema_version":"1.0","source":{"id":"1408.1951","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1408.1951","created_at":"2026-05-18T01:42:22Z"},{"alias_kind":"arxiv_version","alias_value":"1408.1951v1","created_at":"2026-05-18T01:42:22Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1408.1951","created_at":"2026-05-18T01:42:22Z"},{"alias_kind":"pith_short_12","alias_value":"4Y4MXW22KMBG","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_16","alias_value":"4Y4MXW22KMBG562C","created_at":"2026-05-18T12:28:14Z"},{"alias_kind":"pith_short_8","alias_value":"4Y4MXW22","created_at":"2026-05-18T12:28:14Z"}],"graph_snapshots":[{"event_id":"sha256:e78505461d8f68aaf55d4caa9bc8f18036c50e7145dfadf559327d2687a69428","target":"graph","created_at":"2026-05-18T01:42:22Z","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 present the first detection from the Spitzer Space Telescope of 4.5 micron variability from Sgr A*, the emitting source associated with the Milky Way's central black hole. The >23 hour continuous light curve was obtained with the IRAC instrument in 2013 December. The result characterizes the variability of Sgr A* prior to the closest approach of the G2 object, a putative infalling gas cloud that orbits close to Sgr A*. The high stellar density at the location of Sgr A* produces a background of ~250 mJy at 4.5 microns in each pixel with a large pixel-to-pixel gradient, but the light curve fo","authors_text":"A. Ghez, E. E. Becklin, G. G. Fazio, G. Witzel, H. A. Smith, J. Ingalls, J. L. Hora, L. Meyer, M. L. N. Ashby, M. R. Morris, S. Carey, S. P. Willner","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-08T19:57:43Z","title":"Spitzer/IRAC Observations of the Variability of Sgr A* and the Object G2 at 4.5 microns"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1408.1951","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:d196fde6ac70f1d7f1ad567cb65b86c60dbecf4b3678db68011a45610b3fd82a","target":"record","created_at":"2026-05-18T01:42:22Z","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":"cd9369783b87aacc57eec9e4f241de555c8f2d15641c5ded95aa04a6db885791","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-08-08T19:57:43Z","title_canon_sha256":"e763c13d11749f0a9d943c2cf236f5ca742baaad24f8a97f970b64caa8722a41"},"schema_version":"1.0","source":{"id":"1408.1951","kind":"arxiv","version":1}},"canonical_sha256":"e638cbdb5a53026efb4206375506c97171a4aecb2a504a85812ed7d4e64472c0","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e638cbdb5a53026efb4206375506c97171a4aecb2a504a85812ed7d4e64472c0","first_computed_at":"2026-05-18T01:42:22.375019Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:22.375019Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"cYXtIe/TV00bxDoaDdmY9WIgYAyizdktH1z6JUrSB27IZuQNk97xhIYWnz7mVJq/V4JJycjmwn1xZza9KlhvBg==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:22.375504Z","signed_message":"canonical_sha256_bytes"},"source_id":"1408.1951","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d196fde6ac70f1d7f1ad567cb65b86c60dbecf4b3678db68011a45610b3fd82a","sha256:e78505461d8f68aaf55d4caa9bc8f18036c50e7145dfadf559327d2687a69428"],"state_sha256":"9b2735811bf51e6ba06c94fdb4356a1859a4b1fe40bb9b1b46787af6b0b3ffbd"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"be7dd7ycT54CbBLQraTIEfqLjEztS9rvjoVPIqGG586wkOLYTxKGoYM014f5vvRgghT1R01Igm5IgdrlBWqABQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-18T17:59:17.781294Z","bundle_sha256":"8d9e24ba39a124ea8b2ed89b8f794b83ff47875624de15e9dc612f510bf137ff"}}