Precursors of short gamma-ray bursts in the SPI-ACS/INTEGRAL experiment

Minaev, P. Yu.; Pozanenko, A.

doi:10.1134/s1063773717010017

Cited by 41 publications

(39 citation statements)

References 43 publications

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“…The burst onset is delayed to GW trigger to 2 s. A third-order polynomial model was used to fit background signal in time intervals (−118, −30) s and (300, 900) s (data before −118 s are not available). We found for GRB 170817A that there is a deviation of SPI-ACS count statistics from Poisson distribution with a factor of 1.26 (see, e.g., Minaev et al 2010a;Minaev & Pozanenko 2017). Statistical uncertainties for SPI-ACS data were estimated, taking into account the factor of deviation.…”

Section: A4 Sss17a Observationsmentioning

confidence: 99%

“…The duration, T 90 = 1.0 ± 0.4 s, characterizes the burst to be from a short (or type I) population with a probability of ∼ 74% (see Fig. 11 in Minaev & Pozanenko 2017).…”

Section: A4 Sss17a Observationsmentioning

confidence: 99%

“…Using the experimental data given in Svinkin et al (2016);Qin & Chen (2013) ;Minaev & Pozanenko (2017) we constructed the Amati diagram for 20 short bursts and fitted the relation with a power-law-like logarithmic model: log E peak (1+z) 1 keV = (0.50 ± 0.04) log Eiso 1erg + (−22.4 ± 1.8). Details on the investigation of the Amati relation for short GRBs can be found elsewhere (P. Minaev 2018, in preparation).…”

Section: Gbm/fermimentioning

confidence: 99%

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GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission

Pozanenko

Barkov

Minaev

et al. 2018

ApJL

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119

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We present our observations of electromagnetic transients associated with GW170817/GRB 170817A using optical telescopes of Chilescope observatory and Big Scanning Antenna (BSA) of Pushchino Radio Astronomy Observatory at 110 MHz. The Chilescope observatory detected an optical transient of ∼ 19 m on the third day in the outskirts of the galaxy NGC 4993; we continued observations following its rapid decrease. We put an upper limit of 1.5 × 10 4 Jy on any radio source with a duration of 10-60 s which may be associated with GW170817/GRB 170817A. The prompt gamma-ray emission consists of two distinctive components -a hard short pulse delayed by ∼ 2 seconds with respect to the LIGO signal and softer thermal pulse with T ∼ 10 keV lasting for another ∼ 2 seconds. The appearance of a thermal component at the end of the burst is unusual for short GRBs. Both the hard and the soft components do not satisfy the Amati relation, making GRB 170817A distinctively different from other short GRBs. Based on gamma-ray and optical observations, we develop a model for the prompt high-energy emission associated with GRB 170817A. The merger of two neutron stars creates an accretion torus of ∼ 10 −2 M , which supplies the black hole with magnetic flux and confines the BlandfordZnajek-powered jet. We associate the hard prompt spike with the quasispherical breakout of the jet from the disk wind. As the jet plows through the wind with subrelativistic velocity, it creates a radiation-dominated shock that heats the wind material to tens of kiloelectron volts, producing the soft thermal component.

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Section: A4 Sss17a Observationsmentioning

confidence: 99%

“…The duration, T 90 = 1.0 ± 0.4 s, characterizes the burst to be from a short (or type I) population with a probability of ∼ 74% (see Fig. 11 in Minaev & Pozanenko 2017).…”

Section: A4 Sss17a Observationsmentioning

confidence: 99%

Section: Gbm/fermimentioning

confidence: 99%

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GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission

Pozanenko

Barkov

Minaev

et al. 2018

ApJL

Self Cite

119

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show abstract

“…This proposal is strongly supported by the combined detection of the gravitational wave (GW) event GW170817 from coalescing NSs and the subsequent SGRB that was observed by Fermi and INTEGRAL ∼ 1.7 s after [4,5]. Although not observed for this particular event, some SGRBs are preceded by 'precursor' flares: energetically weaker but spectrally similar flashes are seen several seconds prior to the main burst in some cases [6][7][8][9]. If the main episode arises within 2 seconds after the merger, this would imply that some precursors occur before coalescence.…”

Section: Introductionmentioning

confidence: 91%

“…In this paper, we investigate tidally-forced oscillations and the induced crustal strains of rotating, magnetised NSs, to then compare quake energetics and resonance times with the luminosities and orbital frequencies observed for precursor flares from SGRBs [6][7][8][9]. Strong magnetic fields may be important in this scenario, as there is some evidence to suggest that those binaries which emit precursor flares contain magnetars.…”

Section: Introductionmentioning

confidence: 99%

Precursor flares of short gamma-ray bursts from crust yielding due to tidal resonances in coalescing binaries of rotating, magnetized neutron stars

Suvorov

Kokkotas

2020

Phys. Rev. D

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As evidenced by the coincident detections of GW170817 and GRB 170817A, short gamma-ray bursts are likely associated with neutron star-neutron star merger events. Although rare, some bursts display episodes of early emission, with precursor flares being observed up to ∼ 10 seconds prior to the main burst. As the stars inspiral due to gravitational wave emission, the exertion of mutual tidal forces leads to the excitation of stellar oscillation modes, which may come into resonance with the orbital motion. Mode amplitudes increase substantially during a period of resonance as tidal energy is deposited into the star. The neutron star crust experiences shear stress due to the oscillations and, if the resonant amplitudes are large enough, may become over-strained. This over-straining can lead to fractures or quakes which release energy, thereby fueling precursor activity prior to the merger. Using some simple Maclaurin spheroid models, we investigate the influence of magnetic fields and rapid rotation on tidally-forced f -and r-modes, and connect the associated eigenfrequencies with the orbital frequencies corresponding to precursor events seen in, for example, GRB 090510.

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Classification Problem and Parameter Estimating of Gamma-Ray Bursts

Minaev

Pozanenko

2021

Communications in Computer and Information Science

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Precursors of short gamma-ray bursts in the SPI-ACS/INTEGRAL experiment

Cited by 41 publications

References 43 publications

GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission

GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission

Precursor flares of short gamma-ray bursts from crust yielding due to tidal resonances in coalescing binaries of rotating, magnetized neutron stars

Classification Problem and Parameter Estimating of Gamma-Ray Bursts

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