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    "title": "Rapid quasi-periodic X-ray oscillations in a magnetar giant-flare tail",
    "summary": "Israel and colleagues analysed Rossi X-ray Timing Explorer measurements of the tail of the 27 December 2004 SGR 1806–20 giant flare and reported a quasi-periodic signal near 92.5 Hz, together with lower-frequency candidate peaks. Watts and Strohmayer subsequently analysed RHESSI observations of the same flare and found a corresponding phase-dependent feature near 92.5 Hz, a further feature near 626.5 Hz, and broad lower-frequency features. Both groups discussed neutron-star vibration interpretations.",
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    "area": "Astrophysics",
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        "title": "Discovery of rapid X-ray oscillations in the tail of the SGR 1806–20 hyperflare",
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        "date": "2005-05-12"
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        "title": "Detection with RHESSI of high frequency X-ray oscillations in the tail of the 2004 hyperflare from SGR 1806–20",
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            "citation": "Discovery of rapid X-ray oscillations in the tail of the SGR 1806–20 hyperflare",
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          "name": "N. Rea",
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          "source": {
            "citation": "Discovery of rapid X-ray oscillations in the tail of the SGR 1806–20 hyperflare",
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        "description": "The RXTE source lay outside the nominal field of view and telemetry saturation excluded the first roughly 13 seconds. RHESSI also observed the off-axis flare, with atmospheric and spacecraft scattering affecting recorded energy and timing, especially in its rear detector segments. RHESSI did not robustly confirm the earlier 30-Hz feature under its search criteria. The two analyses use different detectors but observe the same flare, not independent astrophysical events. Peak significance depends on time, frequency and rotational-phase selection and noise models. Stellar mode identifications, internal fields and crust properties remain model-dependent, not direct measurements.",
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      "sources": [
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          "url": "https://arxiv.org/pdf/astro-ph/0505255v1"
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        {
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      "statement": "# Rapid quasi-periodic X-ray oscillations in a magnetar giant-flare tail\n\nIsrael and colleagues analysed Rossi X-ray Timing Explorer measurements of the tail of the 27 December 2004 SGR 1806–20 giant flare and reported a quasi-periodic signal near 92.5 Hz, together with lower-frequency candidate peaks. Watts and Strohmayer subsequently analysed RHESSI observations of the same flare and found a corresponding phase-dependent feature near 92.5 Hz, a further feature near 626.5 Hz, and broad lower-frequency features. Both groups discussed neutron-star vibration interpretations.\n\n## Scientific scope\n\nThe RXTE source lay outside the nominal field of view and telemetry saturation excluded the first roughly 13 seconds. RHESSI also observed the off-axis flare, with atmospheric and spacecraft scattering affecting recorded energy and timing, especially in its rear detector segments. RHESSI did not robustly confirm the earlier 30-Hz feature under its search criteria. The two analyses use different detectors but observe the same flare, not independent astrophysical events. Peak significance depends on time, frequency and rotational-phase selection and noise models. Stellar mode identifications, internal fields and crust properties remain model-dependent, not direct measurements.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nG. L. Israel; T. Belloni; L. Stella; Y. Rephaeli; D. E. Gruber; P. Casella; S. Dall’Osso; N. Rea; M. Persic; R. E. Rothschild; Anna L. Watts; Tod E. Strohmayer\n\nThese are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.\n\n\n\n## Original sources\n\n- [Discovery of rapid X-ray oscillations in the tail of the SGR 1806–20 hyperflare](https://arxiv.org/pdf/astro-ph/0505255v1)\n- [Detection with RHESSI of high frequency X-ray oscillations in the tail of the 2004 hyperflare from SGR 1806–20](https://arxiv.org/pdf/astro-ph/0512630v1)\n",
      "summary": "Israel and colleagues analysed Rossi X-ray Timing Explorer measurements of the tail of the 27 December 2004 SGR 1806–20 giant flare and reported a quasi-periodic signal near 92.5 Hz, together with lower-frequency candidate peaks. Watts and Strohmayer subsequently analysed RHESSI observations of the same flare and found a corresponding phase-dependent feature near 92.5 Hz, a further feature near 626.5 Hz, and broad lower-frequency features. Both groups discussed neutron-star vibration interpretations.",
      "title": "Rapid quasi-periodic X-ray oscillations in a magnetar giant-flare tail"
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    "title": "Rapid quasi-periodic X-ray oscillations in a magnetar giant-flare tail",
    "context": "Astrophysics",
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    "what_changed": "Israel and colleagues analysed Rossi X-ray Timing Explorer measurements of the tail of the 27 December 2004 SGR 1806–20 giant flare and reported a quasi-periodic signal near 92.5 Hz, together with lower-frequency candidate peaks. Watts and Strohmayer subsequently analysed RHESSI observations of the same flare and found a corresponding phase-dependent feature near 92.5 Hz, a further feature near 626.5 Hz, and broad lower-frequency features. Both groups discussed neutron-star vibration interpretations.",
    "scope": "Israel and colleagues analysed Rossi X-ray Timing Explorer measurements of the tail of the 27 December 2004 SGR 1806–20 giant flare and reported a quasi-periodic signal near 92.5 Hz, together with lower-frequency candidate peaks. Watts and Strohmayer subsequently analysed RHESSI observations of the same flare and found a corresponding phase-dependent feature near 92.5 Hz, a further feature near 626.5 Hz, and broad lower-frequency features. Both groups discussed neutron-star vibration interpretations. The RXTE source lay outside the nominal field of view and telemetry saturation excluded the first roughly 13 seconds. RHESSI also observed the off-axis flare, with atmospheric and spacecraft scattering affecting recorded energy and timing, especially in its rear detector segments. RHESSI did not robustly confirm the earlier 30-Hz feature under its search criteria. The two analyses use different detectors but observe the same flare, not independent astrophysical events. Peak significance depends on time, frequency and rotational-phase selection and noise models. Stellar mode identifications, internal fields and crust properties remain model-dependent, not direct measurements.",
    "evidence_summary": "The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The RXTE source lay outside the nominal field of view and telemetry saturation excluded the first roughly 13 seconds. RHESSI also observed the off-axis flare, with atmospheric and spacecraft scattering affecting recorded energy and timing, especially in its rear detector segments. RHESSI did not robustly confirm the earlier 30-Hz feature under its search criteria. The two analyses use different detectors but observe the same flare, not independent astrophysical events. Peak significance depends on time, frequency and rotational-phase selection and noise models. Stellar mode identifications, internal fields and crust properties remain model-dependent, not direct measurements.",
    "references": [
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        "title": "Discovery of rapid X-ray oscillations in the tail of the SGR 1806–20 hyperflare",
        "url": "https://arxiv.org/pdf/astro-ph/0505255v1",
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        "title": "Detection with RHESSI of high frequency X-ray oscillations in the tail of the 2004 hyperflare from SGR 1806–20",
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