Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A

Sato, Yuri; Obayashi, Kaori; Yamazaki, Ryo; Murase, Kohta; Ohira, Yutaka

doi:10.1093/mnras/stab1273

Cited by 28 publications

(25 citation statements)

References 77 publications

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“…The lack of detectable optical polarization allows us to disfavor emission from a misaligned jet with θ v 2θ jet (e.g. Sato et al 2021), indicating that viewing angle effects can not explain the bright and delayed peak observed at optical and X-ray wavelengths. Our study of the multi-color light curves and broadband SEDs favors a forward shock plus reverse shock model (Rhodes et al 2020;Salafia et al 2021) in which the early afterglow peak is powered by the reverse shock emission.…”

Section: Discussionmentioning

confidence: 99%

“…It also indicate that a slow component with a soft spectrum is dominating the signal. This could be ascribed to viewing angle effects (Sato et al 2021), thermal emission from the photosphere (Vetere et al 2006;Zhang & Yan 2011) or the cocoon break-out.…”

Section: Prompt Emissionmentioning

confidence: 99%

“…In the case of GRB 190829A, the delayed X-ray and optical peak was interpreted by Sato et al (2021) as emission from a narrow jet (θ j 1 • ) observed at an off-axis angle θ v ∼ 2θ jet . Assuming the same jet parameters of Sato et al ( 2021), we compare our polarization limit with the predictions of off-axis emission using the different jet structures described in Rossi et al (2004): a homogeneous (or top-hat), a Gaussian, and a power-law angular profile.…”

Section: Polarizationmentioning

confidence: 99%

“…& Arons 2013). Sato et al (2021) discussed instead an off-axis twocomponent jet model to explain the peculiar properties of this event, such as its low gamma-ray energy and delayed afterglow peak (e.g. Chand et al 2020;Fraija et al 2021).…”

Section: Introductionmentioning

confidence: 99%

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The early afterglow of GRB 190829A

Dichiara,

Troja,

Lipunov

et al. 2021

Preprint

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GRB 190829A at z=0.0785 is the fourth closest long GRB ever detected by the Neil Gehrels Swift observatory, and the third confirmed case with a very high energy component. We present our multi-wavelength analysis of this rare event, focusing on its early stages of evolution, and including data from Swift, the MASTER global network of optical telescopes, ALMA, and ATCA. We report sensitive limits on the linear polarization of the optical emission, disfavouring models of off-axis jets to explain the delayed afterglow peak. The study of the multi-wavelength light curves and broadband spectra supports a model with at least two emission components: a bright reverse shock emission, visible at early times in the optical and X-rays and, later, in the radio band; and a forward shock component dominating at later times and lower radio frequencies. A combined study of the prompt and afterglow properties shows many similarities with cosmological long GRBs, suggesting that GRB 190829A is an example of classical GRBs in the nearby universe.

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Section: Discussionmentioning

confidence: 99%

Section: Prompt Emissionmentioning

confidence: 99%

Section: Polarizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The early afterglow of GRB 190829A

Dichiara,

Troja,

Lipunov

et al. 2021

Preprint

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“…The inference on the afterglow parameters described so far is based on the assumption of an on-axis viewing angle. On the other hand, a slightly off-axis viewing angle could explain the relatively low luminosity and low peak energy of the observed prompt emission (Sato et al 2021). This would imply, however, some degree of proper motion in the VLBI images (Fernández et al 2021), which can be tested, in principle, with our observations.…”

Section: Viewing Angle Limitsmentioning

confidence: 99%

Multiwavelength View of the Close-by GRB 190829A Sheds Light on Gamma-Ray Burst Physics

Salafia

Ravasio

Yang

et al. 2022

ApJL

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We monitored the position of the close-by (about 370 Mpc) gamma-ray burst GRB 190829A, which originated from a massive star collapse, through very long baseline interferometry (VLBI) observations with the European VLBI Network and the Very Long Baseline Array, carrying out a total of nine observations between 9 and 117 days after the gamma-ray burst at 5 and 15 GHz, with a typical resolution of a few milliarcseconds. From a state-of-the art analysis of these data, we obtained valuable limits on the source size and expansion rate. The limits are in agreement with the size evolution entailed by a detailed modeling of the multiwavelength light curves with a forward-plus-reverse shock model, which agrees with the observations across almost 18 orders of magnitude in frequency (including the HESS data at TeV photon energies) and more than 4 orders of magnitude in time. Thanks to the multiwavelength, high-cadence coverage of the afterglow, inherent degeneracies in the afterglow model are broken to a large extent, allowing us to capture some unique physical insights; we find a low prompt emission efficiency of ≲10−3, a low fraction of relativistic electrons in the forward shock downstream χ e < 13% (90% credible level), and a rapid decay of the magnetic field in the reverse shock downstream after the shock crossing. While our model assumes an on-axis jet, our VLBI astrometry is not sufficiently tight as to exclude any off-axis viewing angle, but we can exclude the line of sight to have been more than ∼2° away from the border of the gamma-ray-producing region based on compactness arguments.

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The Purple Mountain Observatory and Modernization of Chinese Astronomy

2021

Western Influences in the History of Science and Technology in Modern China

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The long gamma-ray burst GRB 191221B has abundant observations in X-ray, optical and radio bands. In the literature, the observed optical light curve of GRB 191221B displays a plateau around 0.1-day, which is rather peculiar in gamma-ray bursts.Here we performed detailed analysis of the observational data from Swift/UVOT, VLT and LCO, obtained the light curve of the multi-band afterglow of GRB 191221B. By examining optical, ultraviolet, X-ray, and radio data for this event, we demonstrate that an on-axis two-component jet model can explain the observations. Our analysis suggests that the narrow component has an initial Lorentz factor of 400 and a jet opening half-angle of 1.4 • , while the wide component has an initial Lorentz factor of 25 and a jet opening half-angle of 2.8 • . The narrow jet dominates the early decay, whereas the wider jet causes the optical plateau and dominates late decay. According to this model, the reason for the absence of the X-ray plateau is due to the steeper spectral index of the wide component, resulting in a less significant flux contribution from the wide jet in the X-ray bands than in the optical bands. Moreover, we have explained the inconsistency in the decay indices of the UVOT and Rc-band data around 2000 seconds using reverse shock emission.

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Off-axis jet scenario for early afterglow emission of low-luminosity gamma-ray burst GRB 190829A

Cited by 28 publications

References 77 publications

The early afterglow of GRB 190829A

The early afterglow of GRB 190829A

Multiwavelength View of the Close-by GRB 190829A Sheds Light on Gamma-Ray Burst Physics

The Purple Mountain Observatory and Modernization of Chinese Astronomy

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