UNVEILING THE ORIGIN OF GRB 090709A: LACK OF PERIODICITY IN A REDDENED COSMOLOGICAL LONG-DURATION GAMMA-RAY BURST

被引：41

作者：

Cenko, S. B. ^{[1
]}

Butler, N. R. ^{[1
]}

Ofek, E. O. ^{[2
]}

Perley, D. A. ^{[1
]}

Morgan, A. N. ^{[1
]}

Frail, D. A. ^{[3
]}

Gorosabel, J. ^{[4
]}

Bloom, J. S. ^{[1
]}

Castro-Tirado, A. J. ^{[4
]}

Cepa, J. ^{[5
]}

Chandra, P. ^{[6
]}

Postigo, A. de Ugarte ^{[7
]}

Filippenko, A. V. ^{[1
]}

Klein, C. R. ^{[1
]}

Kulkarni, S. R. ^{[2
]}

Miller, A. A. ^{[1
]}

Nugent, P. E. ^{[8
]}

Starr, D. L. ^{[1
,9
]}

机构：

[1] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[2] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[3] Natl Radio Astron Observ, Socorro, NM 87801 USA

[4] IAA CSIC, E-18080 Granada, Spain

[5] Inst Astrofis Canarias, San Cristobal la Laguna 38205, Spain

[6] Royal Mil Coll Canada, Dept Phys, Kingston, ON, Canada

[7] INAF Osservatorio Astron Brera, I-23807 Merate, LC, Italy

[8] Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[9] Las Cumbres Observ Global Telescope Network Inc, Goleta, CA 93117 USA

来源：

ASTRONOMICAL JOURNAL | 2010年 / 140卷 / 01期

基金：

美国国家科学基金会;

关键词：

gamma-ray burst: general; stars: neutron; GIANT FLARE; HOST GALAXIES; LUMINOSITY FUNCTION; NEUTRON-STAR; MILKY-WAY; REPEATER; AFTERGLOW; REDSHIFT; PULSAR; DUST;

D O I：

10.1088/0004-6256/140/1/224

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present broadband (gamma-ray, X-ray, near-infrared, optical, and radio) observations of the Swift gamma-ray burst (GRB) 090709A and its afterglow in an effort to ascertain the origin of this high-energy transient. Previous analyses suggested that GRB 090709A exhibited quasi-periodic oscillations with a period of 8.06 s, a trait unknown in long-duration GRBs but typical of flares from soft gamma-ray repeaters. When properly accounting for the underlying shape of the power-density spectrum of GRB 090709A, we find no conclusive (>3 sigma) evidence for the reported periodicity. In conjunction with the location of the transient (far from the Galactic plane and absent any nearby host galaxy in the local universe) and the evidence for extinction in excess of the Galactic value, we consider a magnetar origin relatively unlikely. A long-duration GRB, however, can account for the majority of the observed properties of this source. GRB 090709A is distinguished from other long-duration GRBs primarily by the large amount of obscuration from its host galaxy (A(K,obs) greater than or similar to 2 mag).

引用

页码：224 / 234

页数：11

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