{
  "abstract": "We present a multiwavelength study of the long-duration gamma-ray burst GRB 230328B, combining prompt gamma-ray observations with exceptionally early simultaneous optical photometry and extensive X-ray, radio, and host-galaxy follow-up. NUTTELA- TAO began simultaneous g'r'i' observations only 41 s after the Swift/BAT trigger, corresponding to approximately 16 s in the rest frame for the adopted host-galaxy photometric redshift of z_phot = 1.54+-0.06. Unlike sequential multiband measurements, these observations provide an instantaneous optical spectral slope without temporal-interpolation uncertainties. The early optical continuum remains statistically consistent with a constant slope from approximately 10^2 to 7*10^3 s, providing no evidence for rapid dust destruction. The absence of significant color evolution across the pronounced optical rebrightening at approximately 4*10^3 s demonstrates that it is achromatic and favours a dynamical rather than spectral origin. Broadband modelling shows that the optical, X-ray, and radio evolution can be broadly explained by forward-shock emission with late energy injection, although alternative scenarios cannot be excluded. The red optical continuum is consistent with substantial line-of-sight extinction in a massive, dusty host galaxy. Late-time observations are insufficient to constrain a typical GRB-associated supernova at the adopted redshift. GRB 230328B therefore provides a benchmark for connecting the earliest simultaneous optical colors with afterglow dynamics and the host environment of a representative long GRB.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: Mon Not R Astron Soc (2026)",
  "arxiv": "2606.04585",
  "author_total": 39,
  "authors": [
    {
      "name": "T. Komesh"
    },
    {
      "name": "A. Pozanenko"
    },
    {
      "name": "N. Pankov"
    },
    {
      "name": "A. Volnova"
    },
    {
      "name": "P. Minaev"
    },
    {
      "name": "R. Gill"
    },
    {
      "name": "D. Berdikhan"
    },
    {
      "name": "B. Grossan"
    },
    {
      "name": "Z. Maksut"
    },
    {
      "name": "Z. Abdullayev"
    },
    {
      "name": "S. Belkin"
    },
    {
      "name": "M. Krugov"
    },
    {
      "name": "A. Moskvitin"
    },
    {
      "name": "K. Baigarin"
    },
    {
      "name": "A. Tursynkan"
    },
    {
      "name": "E. Klunko"
    },
    {
      "name": "A. Tatarnikov"
    },
    {
      "name": "S. Zheltoukhov"
    },
    {
      "name": "V. Rumyantsev"
    },
    {
      "name": "A. Volvach"
    },
    {
      "name": "L. Volvach"
    },
    {
      "name": "O. A. Burkhonov"
    },
    {
      "name": "S. A. Ehgamberdiev"
    },
    {
      "name": "R. Inasaridze"
    },
    {
      "name": "L. Elenin"
    },
    {
      "name": "A. Krylov"
    },
    {
      "name": "M. Zheltobryukhov"
    },
    {
      "name": "S. B. Pandey"
    },
    {
      "name": "A. K. Ror"
    },
    {
      "name": "R. Gupta"
    },
    {
      "name": "V. Swain"
    },
    {
      "name": "V. Bhalerao"
    },
    {
      "name": "G. C. Anupama"
    },
    {
      "name": "S. Barway"
    },
    {
      "name": "R. Sánchez-Ramírez"
    },
    {
      "name": "A. J. Castro-Tirado"
    },
    {
      "name": "S. Antier"
    },
    {
      "name": "P. Beniamini"
    },
    {
      "name": "E. Abdikamalov"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/ca9t820m02sct.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.04585",
  "fulltext_url": null,
  "id": "ca9t820m02sct",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.04585",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.04585",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/ca9t820m02sct.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:21:41Z",
      "native_id": "2606.04585",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.04585"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Earliest simultaneous multi-color optical observations of GRB 230328B: from 41 seconds to the host-galaxy identification",
  "title_text": "Earliest simultaneous multi-color optical observations of GRB 230328B: from 41 seconds to the host-galaxy identification",
  "type": "preprint",
  "updated_at": "2026-10-30T12:21:41Z",
  "url": "https://research.draconitic.com/paper/ca9t820m02sct",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1093/mnras/stag1595",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}