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GRB 140206A: the most distant polarized Gamma-Ray Burst. (arXiv:1408.4121v1 [astro-ph.HE])

August 20th, 2014

D. Gotz, P. Laurent, S. Antier, S. Covino, P. D'Avanzo, V. D'Elia, A. Melandri

The nature of the prompt gamma-ray emission of Gamma-Ray Bursts (GRBs) is
still far from being completely elucidated. The measure of linear polarization
is a powerful tool that can be used to put further constraints on the content
and magnetization of the GRB relativistic outflows, as well as on the radiation
processes at work.

To date only a handful of polarization measurements are available for the
prompt emission of GRBs. Here we present the analysis of the prompt emission of
GRB 140206A, obtained with INTEGRAL/IBIS, Swift/BAT, and Fermi/GBM. Using
INTEGRAL/IBIS as a Compton polarimeter we were able to constrain the linear
polarization level of the second peak of this GRB as being larger than 28% at
90% c.l.

We also present the GRB afterglow optical spectroscopy obtained at the
Telescopio Nazionale Galileo (TNG), which allowed us the measure the distance
of this GRB, z=2.739. This distance value together with the polarization
measure obtained with IBIS, allowed us to derive the deepest and most reliable
limit to date (xi <1×10-16) on the possibility of Lorentz Invariance Violation,
measured through the vacuum birefringence effect on a cosmological source.


http://arxiv.org/abs/1408.4121


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Initial follow-up of optical transients with COLORES using the BOOTES network. (arXiv:1408.4370v1 [astro-ph.IM])

August 20th, 2014


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Detailed Afterglow Modeling and Host Galaxy Properties of the Dark GRB 111215A. (arXiv:1408.3923v1 [astro-ph.HE])

August 19th, 2014


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On Spectral Evolution and Temporal Binning in Gamma-Ray Bursts. (arXiv:1408.3973v1 [astro-ph.HE])

August 19th, 2014


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Gamma-Ray Bursts: Temporal Scales and the Bulk Lorentz Factor. (arXiv:1408.3042v1 [astro-ph.HE])

August 14th, 2014


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A Comprehensive Radio View of the Extremely Bright Gamma-Ray Burst 130427A. (arXiv:1404.1945v2 [astro-ph.HE] UPDATED)

August 14th, 2014


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ALMA Observations of the Host Galaxy of GRB090423 at z=8.23: Deep Limits on Obscured Star Formation 630 Million Years After the Big Bang. (arXiv:1408.2520v1 [astro-ph.GA])

August 13th, 2014


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There is a short gamma-ray burst prompt phase at the beginning of each long one. (arXiv:1408.1608v1 [astro-ph.HE])

August 8th, 2014


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Numerical models of black body dominated GRBs: I. Hydrodynamics and the origin of the thermal emission. (arXiv:1408.1305v1 [astro-ph.HE])

August 7th, 2014


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Probing Strange Stars with Advanced Gravitational Wave Detectors. (arXiv:1408.0929v1 [astro-ph.SR])

August 6th, 2014


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