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

Abstract

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 ~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 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 blackmore » 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.« less

Authors:
 [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)
Publication Date:
Research Org.:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Fusion Energy Sciences (FES) (SC-24)
OSTI Identifier:
1542036
Grant/Contract Number:  
SC0016369
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 852; Journal Issue: 2; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; accretion, accretion disks; gamma-ray burst: individual (GRB 170817A); gravitational waves; radio continuum: general; techniques: photometric

Citation Formats

Pozanenko, A. S., Barkov, M. V., Minaev, P. Yu., Volnova, A. A., Mazaeva, E. D., Moskvitin, A. S., Krugov, M. A., Samodurov, V. A., Loznikov, V. M., and Lyutikov, M. GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission. United States: N. p., 2018. Web. doi:10.3847/2041-8213/aaa2f6.
Pozanenko, A. S., Barkov, M. V., Minaev, P. Yu., Volnova, A. A., Mazaeva, E. D., Moskvitin, A. S., Krugov, M. A., Samodurov, V. A., Loznikov, V. M., & Lyutikov, M. GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission. United States. doi:10.3847/2041-8213/aaa2f6.
Pozanenko, A. S., Barkov, M. V., Minaev, P. Yu., Volnova, A. A., Mazaeva, E. D., Moskvitin, A. S., Krugov, M. A., Samodurov, V. A., Loznikov, V. M., and Lyutikov, M. Tue . "GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission". United States. doi:10.3847/2041-8213/aaa2f6. https://www.osti.gov/servlets/purl/1542036.
@article{osti_1542036,
title = {GRB 170817A Associated with GW170817: Multi-frequency Observations and Modeling of Prompt Gamma-Ray Emission},
author = {Pozanenko, A. S. and Barkov, M. V. and Minaev, P. Yu. and Volnova, A. A. and Mazaeva, E. D. and Moskvitin, A. S. and Krugov, M. A. and Samodurov, V. A. and Loznikov, V. M. and Lyutikov, M.},
abstractNote = {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.},
doi = {10.3847/2041-8213/aaa2f6},
journal = {The Astrophysical Journal. Letters},
number = 2,
volume = 852,
place = {United States},
year = {2018},
month = {1}
}

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