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

Journal Article · · The Astrophysical Journal. Letters (Online)
 [1]; ORCiD logo [2];  [3];  [3];  [3];  [4];  [5];  [6];  [7]; ORCiD logo [8]
  1. Space Research Inst., Moscow (Russian Federation); National Research Univ. Higher School of Economics, Moscow (Russian Federation)
  2. Purdue Univ., West Lafayette, IN (United States); RIKEN, Saitama (Japan)
  3. Space Research Inst., Moscow (Russian Federation)
  4. Russian Academy of Sciences (RAS), Moscow (Russian Federation)
  5. Fesenkov Astrophysical Inst., Almaty (Kazakhstan)
  6. National Research Univ. Higher School of Economics, Moscow (Russian Federation); Pushchino Radio Astronomy Observatory ASC LPI (Russian Federation)
  7. Space Research Inst., Moscow (Russian Federation)
  8. Purdue Univ., West Lafayette, IN (United States)

We introduce 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 ~19m 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 × 104 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 s with respect to the LIGO signal and softer thermal pulse with T ~ 10 keV lasting for another ~2 s. 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 determine 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 Blandford–Znajek-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.

Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Fusion Energy Sciences (FES)
Grant/Contract Number:
SC0016369
OSTI ID:
1542036
Journal Information:
The Astrophysical Journal. Letters (Online), Vol. 852, Issue 2; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 64 works
Citation information provided by
Web of Science

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Observational evidence for mass ejection accompanying short gamma ray bursts text January 2017
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Off-axis prompt X-ray transients from the cocoon of short gamma-ray bursts text January 2017
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Cited By (33)

GRID: a student project to monitor the transient gamma-ray sky in the multi-messenger astronomy era journal August 2019
Superluminal motion of a relativistic jet in the neutron-star merger GW170817 journal September 2018
Interpreting GRB170817A as a giant flare from a jet-less double neutron star merger journal November 2018
On-axis view of GRB 170817A journal July 2019
Exclusion of standard ℏω gravitons by LIGO observation journal September 2018
Spectral classification of gravitational-wave emission and equation of state constraints in binary neutron star mergers journal September 2019
Constraints on the emitting region of the gamma-rays observed in GW170817 journal November 2018
Implications of the radio and X-ray emission that followed GW170817 journal April 2018
Observable features of GW170817 kilonova afterglow journal June 2019
Detectability of neutron star merger afterglows journal July 2019
The Palomar Transient Factory Sky2Night programme journal January 2019
The Ep,i–Eiso correlation: type I gamma-ray bursts and the new classification method journal December 2019
Generalized compactness limit from an arbitrary viewing angle journal April 2019
EM counterparts of structured jets from 3D GRMHD simulations
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  • Monthly Notices of the Royal Astronomical Society: Letters, Vol. 484, Issue 1 https://doi.org/10.1093/mnrasl/slz012
journal January 2019
New Gamma-Ray Bursts Found in the Archival Data from the IBIS/ISGRI Telescope of the INTEGRAL Observatory journal October 2019
From γ to Radio: The Electromagnetic Counterpart of GW170817 journal October 2018
Scattered Short Gamma-Ray Bursts as Electromagnetic Counterparts to Gravitational Waves and Implications of GW170817 and GRB 170817A journal October 2018
Diversity of Kilonova Light Curves journal February 2020
Spitzer Space Telescope Infrared Observations of the Binary Neutron Star Merger GW170817 journal July 2018
Multi-messenger Extended Emission from the Compact Remnant in GW170817 journal April 2019
The properties of prompt emission in short gamma-ray bursts with extended emission observed by Fermi/GBM journal January 2020
Monte Carlo simulations of relativistic radiation-mediated shocks: II. photon-starved regime journal December 2019
A multiwavelength analysis of a collection of short-duration GRBs observed between 2012 and 2015 journal February 2019
The First Hours of the GW170817 Kilonova and the Importance of Early Optical and Ultraviolet Observations for Constraining Emission Models journal March 2018
Observational evidence for extended emission to GW170817 journal September 2018
Follow-up of the Neutron Star Bearing Gravitational-wave Candidate Events S190425z and S190426c with MMT and SOAR journal July 2019
Spitzer Space Telescope Infrared Observations of the Binary Neutron Star Merger GW170817 text January 2018
Observational evidence for Extended Emission to GW170817 text January 2018
Superluminal motion of a relativistic jet in the neutron star merger GW170817 text January 2018
A multi-wavelength analysis of a collection of short-duration GRBs observed between 2012-2015 text January 2019
GRID: a Student Project to Monitor the Transient Gamma-Ray Sky in the Multi-Messenger Astronomy Era text January 2019
The Ep,i - Eiso correlation: type I gamma-ray bursts and the new classification method text January 2019
Possible correlations between gamma-ray burst and its host galaxy offset text January 2019

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