Unveiling the origin of GRB090709A: Lack of periodicity in a reddened cosmological long-duration gamma-ray burst

S. B. Cenko; N. R. Butler; E. O. Ofek; D. A. Perley; A. N. Morgan; D. A. Frail; J. Gorosabel; J. S. Bloom; A. J. Castro-Tirado; J. Cepa; P. Chandra; A. De Ugarte Postigo; A. V. Filippenko; C. R. Klein; S. R. Kulkarni; A. A. Miller; P. E. Nugent; D. L. Starr

doi:10.1088/0004-6256/140/1/224

Unveiling the origin of GRB090709A: Lack of periodicity in a reddened cosmological long-duration gamma-ray burst

S. B. Cenko, N. R. Butler, E. O. Ofek, D. A. Perley, A. N. Morgan, D. A. Frail, J. Gorosabel, J. S. Bloom, A. J. Castro-Tirado, J. Cepa, P. Chandra, A. De Ugarte Postigo, A. V. Filippenko, C. R. Klein, S. R. Kulkarni, A. A. Miller, P. E. Nugent, D. L. Starr

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Abstract

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 GRB090709A exhibited quasi-periodic oscillations with a period of 8.06s, 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 GRB090709A, we find no conclusive (>3σ) 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. GRB090709A is distinguished from other long-duration GRBs primarily by the large amount of obscuration from its host galaxy (A_K,obs ≳ 2mag).

Original language	English (US)
Pages (from-to)	224-234
Number of pages	11
Journal	Astronomical Journal
Volume	140
Issue number	1
DOIs	https://doi.org/10.1088/0004-6256/140/1/224
State	Published - 2010
Externally published	Yes

Keywords

Gamma-ray burst: general
Stars: neutron

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-6256/140/1/224

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Cenko, S. B., Butler, N. R., Ofek, E. O., Perley, D. A., Morgan, A. N., Frail, D. A., Gorosabel, J., Bloom, J. S., Castro-Tirado, A. J., Cepa, J., Chandra, P., De Ugarte Postigo, A., Filippenko, A. V., Klein, C. R., Kulkarni, S. R., Miller, A. A., Nugent, P. E., & Starr, D. L. (2010). Unveiling the origin of GRB090709A: Lack of periodicity in a reddened cosmological long-duration gamma-ray burst. Astronomical Journal, 140(1), 224-234. https://doi.org/10.1088/0004-6256/140/1/224

Cenko, SB, Butler, NR, Ofek, EO, Perley, DA, Morgan, AN, Frail, DA, Gorosabel, J, Bloom, JS, Castro-Tirado, AJ, Cepa, J, Chandra, P, De Ugarte Postigo, A, Filippenko, AV, Klein, CR, Kulkarni, SR, Miller, AA, Nugent, PE & Starr, DL 2010, 'Unveiling the origin of GRB090709A: Lack of periodicity in a reddened cosmological long-duration gamma-ray burst', Astronomical Journal, vol. 140, no. 1, pp. 224-234. https://doi.org/10.1088/0004-6256/140/1/224

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abstract = "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 GRB090709A exhibited quasi-periodic oscillations with a period of 8.06s, 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 GRB090709A, we find no conclusive (>3σ) 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. GRB090709A is distinguished from other long-duration GRBs primarily by the large amount of obscuration from its host galaxy (AK,obs ≳ 2mag).",

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AU - Cenko, S. B.

AU - Butler, N. R.

AU - Ofek, E. O.

AU - Perley, D. A.

AU - Morgan, A. N.

AU - Frail, D. A.

AU - Gorosabel, J.

AU - Bloom, J. S.

AU - Castro-Tirado, A. J.

AU - Cepa, J.

AU - Chandra, P.

AU - De Ugarte Postigo, A.

AU - Filippenko, A. V.

AU - Klein, C. R.

AU - Kulkarni, S. R.

AU - Miller, A. A.

AU - Nugent, P. E.

AU - Starr, D. L.

PY - 2010

Y1 - 2010

N2 - 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 GRB090709A exhibited quasi-periodic oscillations with a period of 8.06s, 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 GRB090709A, we find no conclusive (>3σ) 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. GRB090709A is distinguished from other long-duration GRBs primarily by the large amount of obscuration from its host galaxy (AK,obs ≳ 2mag).

AB - 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 GRB090709A exhibited quasi-periodic oscillations with a period of 8.06s, 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 GRB090709A, we find no conclusive (>3σ) 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. GRB090709A is distinguished from other long-duration GRBs primarily by the large amount of obscuration from its host galaxy (AK,obs ≳ 2mag).

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KW - Stars: neutron

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Unveiling the origin of GRB090709A: Lack of periodicity in a reddened cosmological long-duration gamma-ray burst

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Keywords

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