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

S. B. Cenko, Nathaniel 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

Research output: Contribution to journalArticle

26 Citations (Scopus)

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).

Original languageEnglish (US)
Pages (from-to)224-234
Number of pages11
JournalAstronomical Journal
Volume140
Issue number1
DOIs
StatePublished - 2010
Externally publishedYes

Fingerprint

gamma ray bursts
periodicity
periodic variations
near infrared
extinction
oscillation
radio
gamma rays
galaxies
energy
magnetars
repeaters
radio observation
occultation
afterglows
flares
radiant flux density
universe
broadband
oscillations

Keywords

  • Gamma-ray burst: general
  • Stars: neutron

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Unveiling the origin of GRB090709A : Lack of periodicity in a reddened cosmological long-duration gamma-ray burst. / Cenko, S. B.; Butler, Nathaniel; 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.

In: Astronomical Journal, Vol. 140, No. 1, 2010, p. 224-234.

Research output: Contribution to journalArticle

Cenko, SB, Butler, N, 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
Cenko, S. B. ; Butler, Nathaniel ; 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. / Unveiling the origin of GRB090709A : Lack of periodicity in a reddened cosmological long-duration gamma-ray burst. In: Astronomical Journal. 2010 ; Vol. 140, No. 1. pp. 224-234.
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AU - Perley, D. A.

AU - Morgan, A. N.

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AU - Gorosabel, J.

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AU - De Ugarte Postigo, A.

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