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The unusual X-ray emission of the short Swift GRB 090515: Evidence for the formation of a magnetar?

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Paper breakdownThe authors' claims, conditions and measurements, as JSON Signed receiptProof this review has not been altered
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A. Rowlinson, P.T. O'Brien, N.R. Tanvir, B. Zhang, P.A. Evans, N. Lyons, A.J. Levan, R. Willingale
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K.L. Page, O. Onal, D.N. Burrows, A.P. Beardmore, T.N. Ukwatta, E. Berger, J. Hjorth, A.S. Fruchter, R.L. Tunnicliffe, D.B. Fox, A. Cucchiara

High Energy Astrophysical Phenomena · Submitted 13 Jul 2010

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

The authors' main claim We discuss potential causes of the unusual 0.3 - 10 keV emission and suggest it might be energy injection from an unstable millisecond pulsar.

how it is stated · speculative 0.88 read the record →

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arXiv ID1007.2185 (version 2)
Pith IDIKMQR2DF, Pith's permanent record of this paper and its review
CitationA. Cucchiara, A.J. Levan, A.P. Beardmore, A. Rowlinson, A.S. Fruchter, B. Zhang, D.B. Fox, D.N. Burrows, E. Berger, J. Hjorth, K.L. Page, N. Lyons, N.R. Tanvir, O. Onal, P.A. Evans, P.T. O'Brien, R.L. Tunnicliffe, R. Willingale, T.N. Ukwatta. "The unusual X-ray emission of the short Swift GRB 090515: Evidence for the formation of a magnetar?." arXiv:1007.2185 (2010). https://pith.science/paper/IKMQR2DF
Claim paper

The compiled record

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.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 7,820 input tokens, $0.0003 reported.

What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.16 · human participants 0.01 · controlled comparison 0.30 · randomized assignment 0.01 · states quantitative result 0.94 · compares with prior results 0.91 · mentions code or data availability 0.02.

The abstract, sentence by sentence

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

The majority of short gamma-ray bursts (SGRBs) are thought to originate from the merger of compact binary systems collapsing directly to form a black hole. However, it has been proposed that both SGRBs and long gamma-ray bursts (LGRBs) may, on rare occasions, form an unstable millisecond pulsar (magnetar) prior to final collapse. GRB 090515, detected by the Swift satellite was extremely short, with a T_90 of 0.036 +/- 0.016 s, and had a very low fluence of 2 x 10^-8 erg cm^-2 and faint optical afterglow. Despite this, the 0.3 - 10 keV flux in the first 200 s was the highest observed for a SGRB by the Swift X-ray Telescope (XRT). The X-ray light curve showed an unusual plateau and steep decay, becoming undetectable after ~500 s. This behaviour is similar to that observed in some long bursts proposed to have magnetars contributing to their emission. In this paper, we present the Swift observations of GRB 090515 and compare it to other gamma-ray bursts (GRBs) in the Swift sample. Additionally, we present optical observations from Gemini, which detected an afterglow of magnitude 26.4 +/- 0.1 at T+ 1.7 hours after the burst. We discuss potential causes of the unusual 0.3 - 10 keV emission and suggest it might be energy injection from an unstable millisecond pulsar. Using the duration and flux of the plateau of GRB 090515, we place constraints on the millisecond pulsar spin period and magnetic field.

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 The majority of short gamma-ray bursts (SGRBs) are thought to originate from the merger of compact binary systems collapsing directly to form a black hole. background 1.00 0.03 0.02 hedged possibility 0.93
s1 However, it has been proposed that both SGRBs and long gamma-ray bursts (LGRBs) may, on rare occasions, form an unstable millisecond pulsar (magnetar) prior to final collapse. background 0.99 0.04 0.07 hedged possibility 0.99
s2 GRB 090515, detected by the Swift satellite was extremely short, with a T_90 of 0.036 +/- 0.016 s, and had a very low fluence of 2 x 10^-8 erg cm^-2 and faint optical afterglow. result 0.94 0.54 0.03 asserted 1.00
s3 Despite this, the 0.3 - 10 keV flux in the first 200 s was the highest observed for a SGRB by the Swift X-ray Telescope (XRT). result 1.00 0.81 0.05 asserted 1.00
s4 The X-ray light curve showed an unusual plateau and steep decay, becoming undetectable after ~500 s. result 1.00 0.84 0.05 asserted 1.00
s5 This behaviour is similar to that observed in some long bursts proposed to have magnetars contributing to their emission. interpretation 0.90 0.09 0.08 asserted 0.89
s6 In this paper, we present the Swift observations of GRB 090515 and compare it to other gamma-ray bursts (GRBs) in the Swift sample. contribution 0.99 0.91 0.03 asserted 0.79
s7 Additionally, we present optical observations from Gemini, which detected an afterglow of magnitude 26.4 +/- 0.1 at T+ 1.7 hours after the burst. result 0.63 0.92 0.02 asserted 1.00
s8 We discuss potential causes of the unusual 0.3 - 10 keV emission and suggest it might be energy injection from an unstable millisecond pulsar. interpretation 0.99 0.68 0.69 speculative 0.88
s9 Using the duration and flux of the plateau of GRB 090515, we place constraints on the millisecond pulsar spin period and magnetic field. result 0.78 0.95 0.16 asserted 0.99

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 0.87.

What was examined, and what was not

sources read
  • arXiv listing abstract v2
not examined
  • full text
  • figures and tables
  • references and citing sentences
  • relations to other papers
levels run
  • P abstract
not run
  • S sections
  • T body sentences
  • C citations
  • R cross-paper relations

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

The majority of short gamma-ray bursts (SGRBs) are thought to originate from the merger of compact binary systems collapsing directly to form a black hole. However, it has been proposed that both SGRBs and long gamma-ray bursts (LGRBs) may, on rare occasions, form an unstable millisecond pulsar (magnetar) prior to final collapse. GRB 090515, detected by the Swift satellite was extremely short, with a T_90 of 0.036 +/- 0.016 s, and had a very low fluence of 2 x 10^-8 erg cm^-2 and faint optical afterglow. Despite this, the 0.3 - 10 keV flux in the first 200 s was the highest observed for a SGRB by the Swift X-ray Telescope (XRT). The X-ray light curve showed an unusual plateau and steep decay, becoming undetectable after ~500 s. This behaviour is similar to that observed in some long bursts proposed to have magnetars contributing to their emission. In this paper, we present the Swift observations of GRB 090515 and compare it to other gamma-ray bursts (GRBs) in the Swift sample. Additionally, we present optical observations from Gemini, which detected an afterglow of magnitude 26.4 +/- 0.1 at T+ 1.7 hours after the burst. We discuss potential causes of the unusual 0.3 - 10 keV emission and suggest it might be energy injection from an unstable millisecond pulsar. Using the duration and flux of the plateau of GRB 090515, we place constraints on the millisecond pulsar spin period and magnetic field.

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References
How the literature uses it

3 arXiv papers cite this in 4 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 3 sentences without a confident label

Cites it as support 1 paper
  • Dominant emission from the RS region can be invoked to explain plateaus, in particular cases where the plateau is followed by a sudden drop in flux [ref] (rather than, or prior to, a light curve steepening).

    Gamma-ray burst afterglow blast waves · Persistent injection of energy · 0.97

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