2019
DOI: 10.1051/0004-6361/201935831
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On-axis view of GRB 170817A

Abstract: The peculiar short gamma-ray burst GRB 170817A has been firmly associated to the gravitational wave event GW170817, which has been unaninmously interpreted as due to the coalescence of a double neutron star binary. The unprecedented behaviour of the non-thermal afterglow led to a debate about its nature, which was eventually settled by high-resolution VLBI observations, which strongly support the off-axis structured jet scenario. Using information on the jet structure derived from multi-wavelength fitting of t… Show more

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Cited by 75 publications
(75 citation statements)
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References 113 publications
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“…While the link between neutron star mergers and short GRBs has been clearly demonstrated by the detection of GW170817 (Abbott et al 2017c;Goldstein et al 2017), the details of the relationship remains unclear. The inferred onaxis lightcurve of GW170817 is consistent with the known population of short GRBs occuring at cosmological distances (Wu & MacFadyen 2019;Salafia et al 2019b), suggesting that all short GRBs may be produced by the same mechanism and the observed diversity in the short GRB population is caused by extrinsic properties including the viewing angle (Lipunov et al 2001;Rossi et al 2002;Salafia et al 2019a). Direct measurement of viewing angle and outflow energetics of a larger sample of events using VLBI observations will allow this claim to be tested and place tight constraints on the short GRB luminosity function.…”
Section: Observations Of Superluminal Motionsupporting
confidence: 66%
“…While the link between neutron star mergers and short GRBs has been clearly demonstrated by the detection of GW170817 (Abbott et al 2017c;Goldstein et al 2017), the details of the relationship remains unclear. The inferred onaxis lightcurve of GW170817 is consistent with the known population of short GRBs occuring at cosmological distances (Wu & MacFadyen 2019;Salafia et al 2019b), suggesting that all short GRBs may be produced by the same mechanism and the observed diversity in the short GRB population is caused by extrinsic properties including the viewing angle (Lipunov et al 2001;Rossi et al 2002;Salafia et al 2019a). Direct measurement of viewing angle and outflow energetics of a larger sample of events using VLBI observations will allow this claim to be tested and place tight constraints on the short GRB luminosity function.…”
Section: Observations Of Superluminal Motionsupporting
confidence: 66%
“…the observer was misaligned with respect to the collimated ultra-relativistic jet). However, while multi-wavelength observations over two years have built a broad consensus about the interpretation of the non-thermal afterglow emission, the origin of the extremely faint prompt gamma-ray emission observed far from the jet core is still under debate; a gamma-ray emission arising from the slower part of the jet or a gamma-ray emission due to a cocoon shock breakout [see e.g., [95][96][97][98][99].…”
Section: Relativistic Astrophysics and Short Gamma-ray Burstsmentioning
confidence: 99%
“…By assuming that S190814bv launched a short GRB jet, and that all short GRBs have a similar jet structure to that seen in GW170817, we can use the upper limits on any prompt γ-ray emission to constrain the inclination of the system (e.g. Salafia et al 2019;Saleem et al 2020;Song et al 2019). We employ the two jet structures of Lamb et al (2019a) (see also Resmi et al 2018;Salafia et al 2019), both of which are compatible with the afterglow of GRB 170817A, namely a Gaussian and a two-component structure.…”
Section: Constraints Of Grb Afterglow-like Emissionmentioning
confidence: 99%