{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2016:4S3YGOJYDVR5X2XKG4NQVSFRVH","short_pith_number":"pith:4S3YGOJY","canonical_record":{"source":{"id":"1612.02774","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-08T19:03:57Z","cross_cats_sorted":[],"title_canon_sha256":"607467188eeca29133465ad060479c7307b569acd3cce1fe0ec43473ec1ce097","abstract_canon_sha256":"110448df88a599ebb4b079eec952301571febc5eb8dd1ef23471b5d1028e2073"},"schema_version":"1.0"},"canonical_sha256":"e4b78339381d63dbeaea371b0ac8b1a9da849d44b23275e18b704a52a641ad16","source":{"kind":"arxiv","id":"1612.02774","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.02774","created_at":"2026-05-18T00:53:29Z"},{"alias_kind":"arxiv_version","alias_value":"1612.02774v1","created_at":"2026-05-18T00:53:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.02774","created_at":"2026-05-18T00:53:29Z"},{"alias_kind":"pith_short_12","alias_value":"4S3YGOJYDVR5","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"4S3YGOJYDVR5X2XK","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"4S3YGOJY","created_at":"2026-05-18T12:29:58Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2016:4S3YGOJYDVR5X2XKG4NQVSFRVH","target":"record","payload":{"canonical_record":{"source":{"id":"1612.02774","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-08T19:03:57Z","cross_cats_sorted":[],"title_canon_sha256":"607467188eeca29133465ad060479c7307b569acd3cce1fe0ec43473ec1ce097","abstract_canon_sha256":"110448df88a599ebb4b079eec952301571febc5eb8dd1ef23471b5d1028e2073"},"schema_version":"1.0"},"canonical_sha256":"e4b78339381d63dbeaea371b0ac8b1a9da849d44b23275e18b704a52a641ad16","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:53:29.365518Z","signature_b64":"v+4akW+yTxM9WGTx0nvCD7pmGecx0Gby+I2w+9Riw4bGST+811z4x2plOVzMe2ckUb9wDB1cLza0UZyzN34cDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e4b78339381d63dbeaea371b0ac8b1a9da849d44b23275e18b704a52a641ad16","last_reissued_at":"2026-05-18T00:53:29.365059Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:53:29.365059Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1612.02774","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":"2026-05-18T00:53:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"pUAD6CbbTE4YU5TO73QNtOjmYSoXnfRusB70YqKibkAYr6N938BiDA2k2VJ78bgaWdJzzndrITfarMashuxoCw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T19:23:32.887441Z"},"content_sha256":"44bab5b3842e63864077016252a31fbfcb309e30f6a650128398870c8cbbc8f8","schema_version":"1.0","event_id":"sha256:44bab5b3842e63864077016252a31fbfcb309e30f6a650128398870c8cbbc8f8"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2016:4S3YGOJYDVR5X2XKG4NQVSFRVH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The distribution of radioactive $^{44}$Ti in Cassiopeia A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.HE","authors_text":"Alan Hornstrup, Andreas Zoglauer, Brian W. Grefenstette, Charles J. Hailey, Chris L. Fryer, Daniel R. Wik, Daniel Stern, David M. Alexander, Didier Barret, Finn E. Christensen, Fiona A. Harrison, Hiromasa Miyasaka, J. E. Koglin, J. Martin Laming, Karl Forster, Kaya Mori, Kristin K. Madsen, Laura Lopez, Matteo Perri, Michael J. Pivovaroff, Niels J. Westergaard, Paolo Giommi, Peter H. Mao, Simonetta Puccetti, Stephen P. Reynolds, Steven E. Boggs, Takao Kitaguchi, Tracey DeLaney, Vikram Rana, William W. Craig, William W. Zhang","submitted_at":"2016-12-08T19:03:57Z","abstract_excerpt":"The distribution of elements produced in the inner-most layers of a supernova explosion is a key diagnostic for studying the collapse of massive stars. Here we present the results of a 2.4 Ms \\textit{NuSTAR} observing campaign aimed at studying the supernova remnant Cassiopeia A (Cas A). We perform spatially-resolved spectroscopic analyses of the $^{44}$Ti ejecta which we use to determine the Doppler shift and thus the three-dimensional (3D) velocities of the $^{44}$Ti ejecta. We find an initial $^{44}$Ti mass of 1.54 $\\pm$ 0.21 $\\times 10^{-4}$ M$_{\\odot}$ which has a present day average mome"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.02774","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":"2026-05-18T00:53:29Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"akpiomkEXa273KX07mQgHFEaq+DeETbKIn1Q0olcZrAv8KsYpQF5hfJajcjKbWo1HtUjCjt+SZk4Uqh3fwzCCA==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-30T19:23:32.887817Z"},"content_sha256":"ab5c147d0ff4fda7d870ce4d97ccfc1db0f04870f1bff7281460d34101eac36e","schema_version":"1.0","event_id":"sha256:ab5c147d0ff4fda7d870ce4d97ccfc1db0f04870f1bff7281460d34101eac36e"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH/bundle.json","state_url":"https://pith.science/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH/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":"2026-05-30T19:23:32Z","links":{"resolver":"https://pith.science/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH","bundle":"https://pith.science/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH/bundle.json","state":"https://pith.science/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4S3YGOJYDVR5X2XKG4NQVSFRVH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2016:4S3YGOJYDVR5X2XKG4NQVSFRVH","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":"110448df88a599ebb4b079eec952301571febc5eb8dd1ef23471b5d1028e2073","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-08T19:03:57Z","title_canon_sha256":"607467188eeca29133465ad060479c7307b569acd3cce1fe0ec43473ec1ce097"},"schema_version":"1.0","source":{"id":"1612.02774","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1612.02774","created_at":"2026-05-18T00:53:29Z"},{"alias_kind":"arxiv_version","alias_value":"1612.02774v1","created_at":"2026-05-18T00:53:29Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1612.02774","created_at":"2026-05-18T00:53:29Z"},{"alias_kind":"pith_short_12","alias_value":"4S3YGOJYDVR5","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_16","alias_value":"4S3YGOJYDVR5X2XK","created_at":"2026-05-18T12:29:58Z"},{"alias_kind":"pith_short_8","alias_value":"4S3YGOJY","created_at":"2026-05-18T12:29:58Z"}],"graph_snapshots":[{"event_id":"sha256:ab5c147d0ff4fda7d870ce4d97ccfc1db0f04870f1bff7281460d34101eac36e","target":"graph","created_at":"2026-05-18T00:53:29Z","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":"The distribution of elements produced in the inner-most layers of a supernova explosion is a key diagnostic for studying the collapse of massive stars. Here we present the results of a 2.4 Ms \\textit{NuSTAR} observing campaign aimed at studying the supernova remnant Cassiopeia A (Cas A). We perform spatially-resolved spectroscopic analyses of the $^{44}$Ti ejecta which we use to determine the Doppler shift and thus the three-dimensional (3D) velocities of the $^{44}$Ti ejecta. We find an initial $^{44}$Ti mass of 1.54 $\\pm$ 0.21 $\\times 10^{-4}$ M$_{\\odot}$ which has a present day average mome","authors_text":"Alan Hornstrup, Andreas Zoglauer, Brian W. Grefenstette, Charles J. Hailey, Chris L. Fryer, Daniel R. Wik, Daniel Stern, David M. Alexander, Didier Barret, Finn E. Christensen, Fiona A. Harrison, Hiromasa Miyasaka, J. E. Koglin, J. Martin Laming, Karl Forster, Kaya Mori, Kristin K. Madsen, Laura Lopez, Matteo Perri, Michael J. Pivovaroff, Niels J. Westergaard, Paolo Giommi, Peter H. Mao, Simonetta Puccetti, Stephen P. Reynolds, Steven E. Boggs, Takao Kitaguchi, Tracey DeLaney, Vikram Rana, William W. Craig, William W. Zhang","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-08T19:03:57Z","title":"The distribution of radioactive $^{44}$Ti in Cassiopeia A"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1612.02774","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":"sha256:44bab5b3842e63864077016252a31fbfcb309e30f6a650128398870c8cbbc8f8","target":"record","created_at":"2026-05-18T00:53:29Z","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":"110448df88a599ebb4b079eec952301571febc5eb8dd1ef23471b5d1028e2073","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2016-12-08T19:03:57Z","title_canon_sha256":"607467188eeca29133465ad060479c7307b569acd3cce1fe0ec43473ec1ce097"},"schema_version":"1.0","source":{"id":"1612.02774","kind":"arxiv","version":1}},"canonical_sha256":"e4b78339381d63dbeaea371b0ac8b1a9da849d44b23275e18b704a52a641ad16","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e4b78339381d63dbeaea371b0ac8b1a9da849d44b23275e18b704a52a641ad16","first_computed_at":"2026-05-18T00:53:29.365059Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:53:29.365059Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"v+4akW+yTxM9WGTx0nvCD7pmGecx0Gby+I2w+9Riw4bGST+811z4x2plOVzMe2ckUb9wDB1cLza0UZyzN34cDw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:53:29.365518Z","signed_message":"canonical_sha256_bytes"},"source_id":"1612.02774","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:44bab5b3842e63864077016252a31fbfcb309e30f6a650128398870c8cbbc8f8","sha256:ab5c147d0ff4fda7d870ce4d97ccfc1db0f04870f1bff7281460d34101eac36e"],"state_sha256":"eb54adbff11078c8b6220da04f78d61a7a7ece6d133df719b23bf21b6306452b"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"xfkjzjQcxfZRMYiNMx9veIfHSMH21HkS5ppbWT6RiFmRu7Q2pA53fRlWHB7mDZAFMwE2c6EPo4lv9zeZcsU3Aw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-30T19:23:32.889916Z","bundle_sha256":"cd6b1b808a519f65c4a359db5eda39f4628491a6cc1465a0502771a4c0bcff41"}}