An unusual transient following the short GRB 071227

Eyles, R.; O’Brien, P. T.; Wiersema, K.; Starling, R. L. C.; Gompertz, B. P.; Lamb, Gavin P.; Lyman, J. D.; Levan, A. J.; Rosswog, Stephan; Tanvir, N. R.

doi:10.1093/mnras/stz2040

Cited by 4 publications

(1 citation statement)

References 125 publications

(179 reference statements)

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“…Nonetheless, even the color information may be insufficient for an unambiguous identification. A counterpart with unusually red colors was found for the short GRB 070724A (𝑖-𝐾 𝑠 ≈4; Berger et al 2009) and GRB 071227 (𝑟-𝑧≈1.5; Eyles et al 2019) and, in both cases, attributed to dust effects at the GRB site. The rapid timescales and high luminosity (≈ 10 43 erg s −1 ) of these two sources did not match the predictions of a radioactive-powered kilonova, although they could fit within the expected range for a magnetar-powered kilonova (Yu et al 2013).…”

Section: Introductionmentioning

confidence: 93%

A tale of two mergers: constraints on kilonova detection in two short GRBs at z$\sim$0.5

O'Connor,

Troja,

Dichiara

et al. 2020

Preprint

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We present a detailed multi-wavelength analysis of two short Gamma-Ray Bursts (sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at 𝑧 = 0.483 and GRB 200522A at 𝑧 = 0.554. These sGRBs demonstrate very different properties in their observed emission and environment. GRB 160624A is associated to a late-type galaxy with an old stellar population (≈3 Gyr) and moderate on-going star formation (≈1 𝑀 yr −1 ). Hubble and Gemini limits on optical/nIR emission from GRB 160624A are among the most stringent for sGRBs, leading to tight constraints on the allowed kilonova properties. In particular, we rule out any kilonova brighter than AT2017gfo, disfavoring large masses of wind ejecta ( 0.03 𝑀 ).In contrast, observations of GRB 200522A uncovered a luminous (𝐿 F125W ≈ 10 42 erg s −1 at 2.3 d) and red (𝑟 − 𝐻 ≈ 1.3 mag) counterpart. The red color can be explained either by bright kilonova emission powered by the radioactive decay of a large amount of wind ejecta (0.03 𝑀 𝑀 0.1 𝑀 ) or moderate extinction, 𝐸 (𝐵 − 𝑉) ≈ 0.1 − 0.2 mag, along the line of sight. The location of this sGRB in the inner regions of a young (≈0.1 Gyr) star-forming (≈2-4 𝑀 yr −1 ) galaxy and the limited sampling of its counterpart do not allow us to rule out dust effects as contributing, at least in part, to the red color.

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Section: Introductionmentioning

confidence: 93%

A tale of two mergers: constraints on kilonova detection in two short GRBs at z$\sim$0.5

O'Connor,

Troja,

Dichiara

et al. 2020

Preprint

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Investigating the off-axis GRB afterglow scenario for extragalactic fast X-ray transients

Wichern,

Ravasio,

Jonker

et al. 2024

A&A

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Extragalactic fast X-ray transients (FXTs) are short-duration (sim ks) X-ray flashes of unknown origin, potentially arising from binary neutron star (BNS) mergers, tidal disruption events, or supernova shock breakouts. In the context of the BNS scenario, we investigate the possible link between FXTs and the afterglows of off-axis merger-induced gamma-ray bursts (GRBs). By modelling well-sampled broadband afterglows of 13 merger-induced GRBs, we make predictions for their X-ray light curve behaviour had they been observed off-axis, considering both a uniform jet with core angle $ C $ and a Gaussian-structured jet whose edge lies at an angle $ W C $. We compare their peak X-ray luminosity, duration, and temporal indices alpha (where $F alpha $) with those of the currently known extragalactic FXTs. Our analysis reveals that a slightly off-axis observing angle of $ obs C $ and a structured jet are required to explain the shallow ($| 0.3) temporal indices of the FXT light curves, which cannot be reproduced in the uniform-jet case at any viewing angle. In the case of a structured jet with truncation angle $ W C $, the distributions of the duration of the FXTs are consistent with those of the off-axis afterglows for the same range of observing angles, $ obs C $. While the distributions of the off-axis peak X-ray luminosity are consistent only for $ obs C $, focussing on individual events with different intrinsic luminosities reveals that the match of all three properties (peak X-ray luminosity, duration and temporal indices) of the FXTs at the same viewing angle is possible in the range $ obs C $. Despite the small sample of GRBs analysed, these results show that there is a region of the parameter space -- although quite limited -- where the observational properties of off-axis GRB afterglow can be consistent with those of the newly discovered FXTs. Future observations of FXTs discovered by the recently launched Einstein Probe mission and GRB population studies combined with more complex afterglow models will shed light on this possible GRB-FXT connection, and eventually unveil the progenitors of some FXTs.

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OUP accepted manuscript

2021

MNRAS

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We present a detailed multiwavelength analysis of two short gamma-ray bursts (sGRBs) detected by the Neil Gehrels Swift Observatory: GRB 160624A at z = 0.483 and GRB 200522A at z = 0.554. These sGRBs demonstrate very different properties in their observed emission and environment. GRB 160624A is associated with a late-type galaxy with an old stellar population (≈3 Gyr) and moderate ongoing star formation (≈1 M yr −1 ). Hubble and Gemini limits on optical/near-infrared emission from GRB 160624A are among the most stringent for sGRBs, leading to tight constraints on the allowed kilonova properties. In particular, we rule out any kilonova brighter than AT2017gfo, disfavouring large masses of wind ejecta ( 0.03 M ). In contrast, observations of GRB 200522A uncovered a luminous (L F125W ≈ 10 42 erg s −1 at 2.3 d) and red (r − H ≈ 1.3 mag) counterpart. The red colour can be explained either by bright kilonova emission powered by the radioactive decay of a large amount of wind ejecta (0.03 M M 0.1 M ) or moderate extinction, E(B − V) ≈ 0.1−0.2 mag, along the line of sight. The location of this sGRB in the inner regions of a young (≈0.1 Gyr) star-forming (≈2−6 M yr −1 ) galaxy and the limited sampling of its counterpart do not allow us to rule out dust effects as contributing, at least in part, to the red colour.

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An unusual transient following the short GRB 071227

Cited by 4 publications

References 125 publications

A tale of two mergers: constraints on kilonova detection in two short GRBs at z$\sim$0.5

A tale of two mergers: constraints on kilonova detection in two short GRBs at z$\sim$0.5

Investigating the off-axis GRB afterglow scenario for extragalactic fast X-ray transients

OUP accepted manuscript

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