Unveiling the Origin of GRB 090709A: Lack of Periodicity in a Reddened Cosmological Long-Duration Gamma-Ray Burst - Astrophysics > High Energy Astrophysical PhenomenaReport as inadecuate




Unveiling the Origin of GRB 090709A: Lack of Periodicity in a Reddened Cosmological Long-Duration Gamma-Ray Burst - Astrophysics > High Energy Astrophysical Phenomena - Download this document for free, or read online. Document in PDF available to download.

Abstract: We present broadband gamma-ray, X-ray, near-infrared, optical, and radioobservations of the gamma-ray burst GRB 090709A and its afterglow in aneffort to ascertain the origin of this high-energy transient. Previous analysessuggested that GRB 090709A exhibited quasi-periodic oscillations with a periodof 8.06 s, a trait unknown in long-duration GRBs but typical of flares fromsoft gamma-ray repeaters. When properly accounting for the underlying shape ofthe power-density spectrum of GRB 090709A, we find no conclusive > 3 sigmaevidence for the reported periodicity. In conjunction with the location of thetransient far from the Galactic plane and absent any nearby host galaxy in thelocal universe and the evidence for extinction in excess of the Galacticvalue, we consider a magnetar origin relatively unlikely. A long-duration GRB,however, can account for the majority of the observed properties of thissource. GRB 090709A is distinguished from other long-duration GRBs primarily bythe large amount of obscuration from its host galaxy A K,obs >~ 2 mag.



Author: 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

Source: https://arxiv.org/



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