A global test of jet structure and delay time distribution of short-duration gamma-ray bursts

Abstract

The multi-messenger joint observations of GW170817 and GRB170817A shed new light on the study of short-duration gamma-ray bursts (SGRBs). Not only did it substantiate the assumption that SGRBs originate from binary neutron star (BNS) mergers, but it also confirms that the jet generated by this type of merger must be structured, hence the observed energy of an SGRB depends on the viewing angle from the observer. However, the precise structure of the jet is still subject to debate. Moreover, whether a single unified jet model can be applied to all SGRBs is not known. Another uncertainty is the delay timescale of BNS mergers with respect to star formation history of the Universe. In this paper, we conduct a global test of both delay and jet models of BNS mergers across a wide parameter space with simulated SGRBs. We compare the simulated peak flux, redshift and luminosity distributions with the observed ones and test the goodness-of-fit for a set of models and parameter combinations. Our simulations suggest that GW170817/GRB 170817A and all SGRBs can be understood within the framework of a universal structured jet viewed at different viewing angles. Furthermore, models invoking a jet plus cocoon structure with a lognormal delay timescale is most favored. Some other combinations (e.g. a Gaussian delay with a power-law jet model) are also acceptable. However, the Gaussian delay with Gaussian jet model and the entire set of power-law delay models are disfavored.

9 pages, 5 figures, Published in MNRAS. Updated to correct typos

References in corpus (20)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• Multi-messenger Observations of a Binary Neutron Star Merger
• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• The Supernova -- Gamma-Ray Burst Connection
• An Ordinary Short Gamma-Ray Burst with Extraordinary Implications: Fermi-GBM Detection of GRB 170817A
• The X-ray counterpart to the gravitational wave event GW 170817
• Discerning the physical origins of cosmological Gamma-ray bursts based on multiple observational criteria: the cases of z=6.7 GRB 080913, z=8.3 GRB 090423, and some short/hard GRBs
• The rate, luminosity function and time delay of non-Collapsar short GRBs
• Afterglow Lightcurves from Misaligned Structured Jets
• Revisiting the Long/Soft-Short/Hard Classification of Gamma-Ray Bursts in the Fermi Era
• A Comparative Study of Long and Short GRBs. I. Overlapping Properties
• On the energy and redshift distributions of fast radio bursts
• The Delay Time of Gravitational Wave -- Gamma-Ray Burst Associations
• Propagation of a Short GRB Jet in the Ejecta: Jet Launching Delay Time, Jet Structure, and GW170817/GRB 170817A
• Robust Features of Off-Axis Gamma-Ray Burst Afterglow Lightcurves
• Observational Inference on the Delay Time Distribution of Short Gamma-ray Bursts
• Afterglows and Kilonovae Associated with Nearby Low-Luminosity Short-Duration Gamma-Ray Bursts: Application to GW170817/GRB170817A
• The Consequences of Gamma-ray Burst Jet Opening Angle Evolution on the Inferred Star Formation Rate
• The Luminosity Distribution of Short Gamma-Ray Bursts under a Structured Jet Scenario
• Jet-Cocoon Geometry in the Optically Dark, Very High Energy Gamma-ray Burst 201216C

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• Diverse origins for non-repeating fast radio bursts: Rotational radio transient sources and cosmological compact binary merger remnants
• Constraining the Luminosity Function and Delay-Time Distribution of Short Gamma-Ray Bursts for Multimessenger Gravitational-Wave Detection Rate Estimation
• Short gamma-ray burst progenitors have short delay times