{"record_type":"pith_number_record","schema_url":"https://pith.science/schemas/pith-number/v1.json","pith_number":"pith:2006:L7SQDXKJAZTT4NSPPVMAFZJKYM","short_pith_number":"pith:L7SQDXKJ","schema_version":"1.0","canonical_sha256":"5fe501dd4906673e364f7d5802e52ac30835d4674c4d82abdf519cf034a80c7f","source":{"kind":"arxiv","id":"astro-ph/0608599","version":1},"attestation_state":"computed","paper":{"title":"INTEGRAL spectral variability study of the atoll 4U 1820-30: first detection of hard X-ray emission","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), Andrzej A. Zdziarski (3) ((1)IASF/INAF-Roma, Angela Bazzano (1), Antonella Tarana (1, Italy (2) Universita' di Roma Tor Vergata, Italy (3)Centrum Astronomiczne im. M. Kopernika, Pietro Ubertini (1), Poland), Warszawa","submitted_at":"2006-08-28T16:12:27Z","abstract_excerpt":"We study the 4-200 keV spectral and temporal behaviour of the low mass X-ray binary 4U 1820-30 with INTEGRAL during 2003-2005. This source as been observed in both the soft (banana) and hard (island) spectral states. A high energy tail, above 50 keV, in the hard state has been observed for the first time. This places the source in the category of X-ray bursters showing high-energy emission. The tail can be modeled as a soft power law component, with the photon index of ~2.4, on top of thermal Comptonization emission from a plasma with the electron temperature of kT_e~6 keV and optical depth of"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"astro-ph/0608599","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-08-28T16:12:27Z","cross_cats_sorted":[],"title_canon_sha256":"dc925b9109ee5a7d97ac097eda3812100aa23a99f2a58f66adb3f47388834bc8","abstract_canon_sha256":"b66dad9542cb9dfe76e1b4c65aea687b3dbb8e6d22b8f81aa6ae6e2430114ba3"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T15:16:51.793168Z","signature_b64":"cA+C96mDuN+x6obZcMYsdNuGuzCWHrBIiuDpFV+tZKea88IbNtejuvnoksj+uji+C8mkDYkiECoJGuBs+LOVAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5fe501dd4906673e364f7d5802e52ac30835d4674c4d82abdf519cf034a80c7f","last_reissued_at":"2026-07-04T15:16:51.792753Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T15:16:51.792753Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"INTEGRAL spectral variability study of the atoll 4U 1820-30: first detection of hard X-ray emission","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"2), Andrzej A. Zdziarski (3) ((1)IASF/INAF-Roma, Angela Bazzano (1), Antonella Tarana (1, Italy (2) Universita' di Roma Tor Vergata, Italy (3)Centrum Astronomiczne im. M. Kopernika, Pietro Ubertini (1), Poland), Warszawa","submitted_at":"2006-08-28T16:12:27Z","abstract_excerpt":"We study the 4-200 keV spectral and temporal behaviour of the low mass X-ray binary 4U 1820-30 with INTEGRAL during 2003-2005. This source as been observed in both the soft (banana) and hard (island) spectral states. A high energy tail, above 50 keV, in the hard state has been observed for the first time. This places the source in the category of X-ray bursters showing high-energy emission. The tail can be modeled as a soft power law component, with the photon index of ~2.4, on top of thermal Comptonization emission from a plasma with the electron temperature of kT_e~6 keV and optical depth of"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0608599","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/astro-ph/0608599/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"},"aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0608599","created_at":"2026-07-04T15:16:51.792807+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0608599v1","created_at":"2026-07-04T15:16:51.792807+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0608599","created_at":"2026-07-04T15:16:51.792807+00:00"},{"alias_kind":"pith_short_12","alias_value":"L7SQDXKJAZTT","created_at":"2026-07-04T15:16:51.792807+00:00"},{"alias_kind":"pith_short_16","alias_value":"L7SQDXKJAZTT4NSP","created_at":"2026-07-04T15:16:51.792807+00:00"},{"alias_kind":"pith_short_8","alias_value":"L7SQDXKJ","created_at":"2026-07-04T15:16:51.792807+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":1,"internal_anchor_count":1,"sample":[{"citing_arxiv_id":"2605.19877","citing_title":"The first IXPE view of the eclipsing ADC source 4U 1822-37","ref_index":74,"is_internal_anchor":true}]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM","json":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM.json","graph_json":"https://pith.science/api/pith-number/L7SQDXKJAZTT4NSPPVMAFZJKYM/graph.json","events_json":"https://pith.science/api/pith-number/L7SQDXKJAZTT4NSPPVMAFZJKYM/events.json","paper":"https://pith.science/paper/L7SQDXKJ"},"agent_actions":{"view_html":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM","download_json":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM.json","view_paper":"https://pith.science/paper/L7SQDXKJ","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0608599&json=true","fetch_graph":"https://pith.science/api/pith-number/L7SQDXKJAZTT4NSPPVMAFZJKYM/graph.json","fetch_events":"https://pith.science/api/pith-number/L7SQDXKJAZTT4NSPPVMAFZJKYM/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM/action/timestamp_anchor","attest_storage":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM/action/storage_attestation","attest_author":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM/action/author_attestation","sign_citation":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM/action/citation_signature","submit_replication":"https://pith.science/pith/L7SQDXKJAZTT4NSPPVMAFZJKYM/action/replication_record"}},"created_at":"2026-07-04T15:16:51.792807+00:00","updated_at":"2026-07-04T15:16:51.792807+00:00"}