Simultaneous radio and optical polarimetry of GRB 191221B afterglow

Urata, Y.; Toma, Kenji; Covino, S.; Wiersema, K.; Huang, K. Y.; Shimoda, Jiro; Kuwata, Asuka; Nagao, Sota; Asada, Keiichi; Nagai, Hiroshi; Takahashi, Satoko; Chung, Chao-En; Petitpas, G.; Yamaoka, K.; Izzo, L.; Fynbo, J. P. U.; Postigo, A. de Ugarte; Arabsalmani, M.; Tashiro, M.

doi:10.1038/s41550-022-01832-7

Cited by 5 publications

(1 citation statement)

References 58 publications

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“…These predictions are largely consistent with results from time-resolved GRB afterglow measurements of optical polarization (Mundell et al 2013;Covino & Gotz 2016;Stringer & Lazzati 2020). Radio polarization measurements typically show a lower PD than do the optical measurements (Urata et al 2019(Urata et al , 2023, motivating an increasing interest in a multiwavelength modeling of late-afterglow polarization (Shimoda & Toma 2021;Birenbaum & Bromberg 2021). No observations of afterglow polarization have been reported so far at X-ray energies.…”

Section: Introductionsupporting

confidence: 80%

The IXPE View of GRB 221009A

Negro

Lalla

Omodei

et al. 2023

ApJL

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We present the IXPE observation of GRB 221009A, which includes upper limits on the linear polarization degree of both prompt and afterglow emission in the soft X-ray energy band. GRB 221009A is an exceptionally bright gamma-ray burst (GRB) that reached Earth on 2022 October 9 after traveling through the dust of the Milky Way. The Imaging X-ray Polarimetry Explorer (IXPE) pointed at GRB 221009A on October 11 to observe, for the first time, the 2–8 keV X-ray polarization of a GRB afterglow. We set an upper limit to the polarization degree of the afterglow emission of 13.8% at a 99% confidence level. This result provides constraints on the jet opening angle and the viewing angle of the GRB, or alternatively, other properties of the emission region. Additionally, IXPE captured halo-rings of dust-scattered photons that are echoes of the GRB prompt emission. The 99% confidence level upper limit to the prompt polarization degree depends on the background model assumption, and it ranges between ∼55% and ∼82%. This single IXPE pointing provides both the first assessment of X-ray polarization of a GRB afterglow and the first GRB study with polarization observations of both the prompt and afterglow phases.

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Section: Introductionsupporting

confidence: 80%

The IXPE View of GRB 221009A

Negro

Lalla

Omodei

et al. 2023

ApJL

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A two-component jet model for the optical plateau in the afterglow of GRB 191221B

Zhu,

Wang,

Zhou

et al. 2023

Monthly Notices of the Royal Astronomical Society

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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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Black hole growths in gamma-ray bursts driven by the Blandford–Znajek mechanism

Li,

Liu

2023

Monthly Notices of the Royal Astronomical Society

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The Blandford–Znajek (BZ) mechanism in stellar-mass black hole (BH) hyperaccretion systems is generally considered to power gamma-ray bursts (GRBs). Based on observational GRB data, we use the BZ mechanism driven by the BH hyperaccretion disc to investigate the evolution of the BH mass and spin after the jets break out from the progenitors. We find that the BH growths are almost independent of initial BH masses. Meanwhile, the BH growths will be more efficient with smaller initial spin parameters. We conclude that (i) the BZ mechanism is efficient for triggering BH growths for only 1 of 206 typical long-duration GRBs; (ii) the mean BH mass growths of ultra-long GRBs are marginal for all 7 samples collected; (iii) for the short-duration GRBs, the results that BHs show minimal growths is consistent with the mass supply limitation in the scenario of compact object mergers.

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Simultaneous radio and optical polarimetry of GRB 191221B afterglow

Abstract: Gamma-ray bursts (GRBs) are the most luminous transients in the universe and are utilized as probes of early stars, gravitational wave counterparts, and collisionless shock physics.

Cited by 5 publications

References 58 publications

The IXPE View of GRB 221009A

The IXPE View of GRB 221009A

A two-component jet model for the optical plateau in the afterglow of GRB 191221B

Black hole growths in gamma-ray bursts driven by the Blandford–Znajek mechanism

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