{
  "abstract": "After decades of only failed transitions, the black hole X-ray binary GS 1354-64 has undergone a complete outburst again. We present its first X-ray polarimetric investigation in the fading steep-power-law (SPL) state, following an earlier intermediate-state IXPE campaign during the same outburst. The 2-8 keV emission has a polarization degree (PD) of 2.3 +/- 0.2% and polarization angle (PA) of 5 +/- 3 degrees. Compared with the intermediate state, where PD=3.9 +0.3/-0.2% and PA=-2 +/-2 degrees, the broadband PD is lower while the PA remains consistent. The intermediate-state type-C quasi-periodic oscillation state has also disappeared, marking a major reconfiguration of the accretion flow. Assuming a distance of 7 kpc, the observed the intensity drop from 2.5% to 1.6% of the Eddington luminosity over 10.2 days is punctuated by several broad hour-to-day-scale troughs, tracing two distinct tracks in hardness-intensity space. Simultaneous spectroscopy shows the troughs' spectra contains a cooler disk with smaller apparent normalization, while no change in the Compton component's photon index or normalization is required between tracks. The model-independent analysis identifies a steeper increase in PD with energy outside the troughs, yielding G_E=1.5 +/- 0.2%/keV, compared with G_E=0.7 +0.3/-0.5%/keV during the troughs. Their duration and spectropolarimetric morphology distinguish the troughs from traditional short absorption dips seen in X-ray binaries, providing a possible stellar-mass analog of the recurrent accretion changes that drive \"changing-look\" behavior in supermassive black hole systems.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.39384",
  "author_total": 23,
  "authors": [
    {
      "name": "Swati Ravi"
    },
    {
      "name": "James F. Steiner"
    },
    {
      "name": "Megan Masterson"
    },
    {
      "name": "Lorenzo Marra"
    },
    {
      "name": "Philip Kaaret"
    },
    {
      "name": "Alexandra Veledina"
    },
    {
      "name": "Michal Dovciak"
    },
    {
      "name": "Adam Ingram"
    },
    {
      "name": "Fiamma Capitanio"
    },
    {
      "name": "Sudeb Ranjan Datta"
    },
    {
      "name": "Elise Egron"
    },
    {
      "name": "Javier A. Garcia"
    },
    {
      "name": "Ole Koenig"
    },
    {
      "name": "Honghui Liu"
    },
    {
      "name": "Herman L. Marshall"
    },
    {
      "name": "Guglielmo Mastroserio"
    },
    {
      "name": "Romana Mikusincova"
    },
    {
      "name": "Joey Neilsen"
    },
    {
      "name": "Edward J. R. Nathan"
    },
    {
      "name": "P. -O. Petrucci"
    },
    {
      "name": "Jakub Podgorny"
    },
    {
      "name": "Jiri Svoboda"
    },
    {
      "name": "Yuexin Zhang"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7x8gv23bc6fww.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.39384",
  "fulltext_url": null,
  "id": "7x8gv23bc6fww",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.39384",
  "language": null,
  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2610.39384",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-29",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7x8gv23bc6fww.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:23Z",
      "native_id": "2610.39384",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.39384"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "The Disk Awakens: IXPE's Sequel Observation of GS 1354-64 Suggests Changing-Look Behavior in the Steep-Power-Law State",
  "title_text": "The Disk Awakens: IXPE's Sequel Observation of GS 1354-64 Suggests Changing-Look Behavior in the Steep-Power-Law State",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:45Z",
  "url": "https://research.draconitic.com/paper/7x8gv23bc6fww",
  "venue": "arXiv",
  "versions": []
}