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Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?

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G. Ghisellini (1), G. Ghirlanda (1), S. Mereghetti (2), Z. Bosnjak (1), F. Tavecchio (1), C. Firmani (1, 3) ((1)INAF-Osservatorio Astronomico di Brera, (2)INAF-IASF-Milano
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(3)Instituto de Astronomia, U.N.A.M. Mexico)

Astrophysics · Submitted 17 May 2006

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim We then investigate if a hard-to-soft spectral evolution in GRB 031203 and GRB 980425, consistent with all the observed properties, can give rise to a time integrated spectrum with an E_peak consistent with the Amati relation.

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arXiv IDastro-ph/0605431 (version 2)
Pith IDUZOG6OR6, Pith's permanent record of this paper and its review
Citation(2)INAF-IASF-Milano, 3) ((1)INAF-Osservatorio Astronomico di Brera, (3)Instituto de Astronomia, C. Firmani (1, F. Tavecchio (1), G. Ghirlanda (1), G. Ghisellini (1), S. Mereghetti (2), U.N.A.M. Mexico), Z. Bosnjak (1). "Are GRB 980425 and GRB 031203 real outliers or twins of GRB 060218?." arXiv:astro-ph/0605431 (2006). https://pith.science/paper/UZOG6OR6
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The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

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Compiled by classifier-1.13.0 via TypeSafe API, question bank abstract-p1-20260923, 2026-09-23: 1 request, 5,256 input tokens.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.18 · human participants 0.01 · controlled comparison 0.52 · randomized assignment 0.01 · states quantitative result 0.72 · compares with prior results 0.78 · mentions code or data availability 0.01.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; .

GRB 980425 and GRB 031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy E_iso emitted in the prompt radiation phase and the peak frequency E_peak of the spectrum in a vF(v) representation (the so-called Amati relation). We discuss if these two bursts are really different from the others or if their location in the E_iso-E_peak plane is the result of other effects, such as viewing them off-axis, or through a scattering screen, or a misinterpretation of their spectral properties. The latter case seems particularly interesting after GRB 060218, that, unlike GRB 031203 and GRB 980425, had a prompt emission detected both in hard and soft X-rays which lasted ~2800 seconds. This allowed to determine its E_peak and total emitted energy. Although it shares with GRB 031203 the total energetics, it is not an outlier with respect to the Amati correlation. We then investigate if a hard-to-soft spectral evolution in GRB 031203 and GRB 980425, consistent with all the observed properties, can give rise to a time integrated spectrum with an E_peak consistent with the Amati relation.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#sentencerolethe authors' own workstates the main conclusionstrength
s0 GRB 980425 and GRB 031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy E_iso emitted in the prompt radiation phase and the peak frequency E_peak of the spectrum in a vF(v) representation (the so-called Amati relation). background 0.98 0.13 0.07 hedged possibility 0.54
s1 We discuss if these two bursts are really different from the others or if their location in the E_iso-E_peak plane is the result of other effects, such as viewing them off-axis, or through a scattering screen, or a misinterpretation of their spectral properties. contribution 0.85 0.25 0.05 unclear 0.38
s2 The latter case seems particularly interesting after GRB 060218, that, unlike GRB 031203 and GRB 980425, had a prompt emission detected both in hard and soft X-rays which lasted ~2800 seconds. background 0.94 0.09 0.04 hedged possibility 0.57
s3 This allowed to determine its E_peak and total emitted energy. background 0.40 0.22 0.03 asserted 0.98
s4 Although it shares with GRB 031203 the total energetics, it is not an outlier with respect to the Amati correlation. result 0.80 0.36 0.21 asserted 1.00
s5 We then investigate if a hard-to-soft spectral evolution in GRB 031203 and GRB 980425, consistent with all the observed properties, can give rise to a time integrated spectrum with an E_peak consistent with the Amati relation. contribution 0.84 0.53 0.11 hedged possibility 0.91

What kind of paper the classifier reports this is: position or commentary 0.71 · evidence from analysis of existing data 0.88.

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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper
Original abstract

GRB 980425 and GRB 031203 are apparently two outliers with respect to the correlation between the isotropic equivalent energy E_iso emitted in the prompt radiation phase and the peak frequency E_peak of the spectrum in a vF(v) representation (the so-called Amati relation). We discuss if these two bursts are really different from the others or if their location in the E_iso-E_peak plane is the result of other effects, such as viewing them off-axis, or through a scattering screen, or a misinterpretation of their spectral properties. The latter case seems particularly interesting after GRB 060218, that, unlike GRB 031203 and GRB 980425, had a prompt emission detected both in hard and soft X-rays which lasted ~2800 seconds. This allowed to determine its E_peak and total emitted energy. Although it shares with GRB 031203 the total energetics, it is not an outlier with respect to the Amati correlation. We then investigate if a hard-to-soft spectral evolution in GRB 031203 and GRB 980425, consistent with all the observed properties, can give rise to a time integrated spectrum with an E_peak consistent with the Amati relation.

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