Low-frequency View of GW170817/GRB 170817A with the Giant Metrewave Radio Telescope

被引：73

作者：

Resmi, L. ^{[1
]}

Schulze, S. ^{[2
]}

Ishwara-Chandra, C. H. ^{[3
,4
,5
]}

Misra, K. ^{[6
]}

Buchner, J. ^{[7
]}

De Pasquale, M. ^{[8
]}

Sanchez-Ramirez, R. ^{[9
,10
]}

Klose, S. ^{[11
]}

Kim, S. ^{[12
,13
,14
]}

Tanvir, N. R. ^{[15
]}

O'Brien, P. T. ^{[15
]}

机构：

[1] Indian Inst Space Sci & Technol, Trivandrum 695547, Kerala, India

[2] Weizmann Inst Sci, Dept Particle Phys & Astrophys, IL-761000 Rehovot, Israel

[3] Natl Ctr Radio Astrophys, Pune 411007, Maharashtra, India

[4] Univ Cape Town, Interuniv Inst Data Intens Astron, ZA-7700 Cape Town, South Africa

[5] Univ Cape Town, Dept Astron, ZA-7700 Cape Town, South Africa

[6] Aryabhatta Res Inst Observat Sci ARIES, Manora Peak 263001, Nainital, India

[7] Pontificia Univ Catolica Chile, Inst Astrofis, Casilla 306, Santiago 22, Chile

[8] Istanbul Univ, Dept Astron & Space Sci, TR-34119 Istanbul, Turkey

[9] INAF, Ist Astrofis & Planetol Spaziali, Via Fosso Cavaliere 100, I-00133 Rome, Italy

[10] CSIC, IAA, Glorieta Astron S-N, E-18008 Granada, Spain

[11] Thuringer Landessternwarte, Sternwarte 5, D-07778 Tautenburg, Germany

[12] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Casilla 306, Santiago 22, Chile

[13] Pontificia Univ Catolica Chile, Fac Fis, Ctr Astroingn, Casilla 306, Santiago 22, Chile

[14] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[15] Univ Leicester, Dept Phys & Astron, Univ Rd, Leicester LE1 7RH, Leics, England

来源：

ASTROPHYSICAL JOURNAL | 2018年 / 867卷 / 01期

基金：

欧盟地平线“2020”;

关键词：

gamma-ray burst: individual (GRB 170817A); gravitational waves; GAMMA-RAY BURST; EMISSION; AFTERGLOW; MERGER; JETS;

D O I：

10.3847/1538-4357/aae1a6

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

The short gamma-ray burst (GRB) 170817A was the first GRB associated with a gravitational-wave event. Due to the exceptionally low luminosity of the prompt gamma-ray and the afterglow emission, the origin of both radiation components is highly debated. The most discussed models for the burst and the afterglow include a regular GRB jet seen off-axis and the emission from the cocoon encompassing a "choked" jet. Here, we report low radio frequency observations at 610 and 1390. MHz obtained with the Giant Metrewave Radio Telescope. Our observations span a range of similar to 7 to similar to 152 days after the burst. The afterglow started to emerge at these low frequencies about 60. days after the burst. The 1390. MHz light curve barely evolved between 60 and 150 days, but its evolution is also marginally consistent with an F-v alpha t(0.8) rise seen in higher frequencies. We model the radio data and archival X-ray, optical, and high-frequency radio data with models of top-hat and Gaussian structured GRB jets. We performed a Markov Chain Monte Carlo analysis of the structured-jet parameter space. Though highly degenerate, useful bounds on the posterior probability distributions can be obtained. Our bounds of the viewing angle are consistent with that inferred from the gravitational-wave signal. We estimate the energy budget in prompt emission to be an order of magnitude lower than that in the afterglow blast wave.

引用

页数：10

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