Optical and near-infrared flares in GRB afterglows

Krühler, T.

doi:10.1017/s1743921312012677

Cited by 2 publications

(1 citation statement)

References 25 publications

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“…In general, optical light curves of the gamma-ray bursts (GRBs) in the afterglow phase are described fairly well by smoothly broken-power law (Beuermann et al 1999) with temporal indices in the range from -0.5 to -2.5 (Krühler 2012). However, for the many well-sampled optical light curves after subtracting the host-galaxy component significant deviations (inhomogeneities) from the smoothly broken-power law are observed.…”

Section: Introductionmentioning

confidence: 99%

Inhomogeneities in the light curves of gamma-ray bursts afterglow

Mazaeva

Pozanenko

Minaev

2018

Int. J. Mod. Phys. D

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We discuss the inhomogeneous behavior of gamma-ray burst afterglow light curves in optic. We use well-sampled light curves based on mostly our own observations to find and identify deviations (inhomogeneities) from broken power law. By the inhomogeneous behavior we mean flashes, bumps, slow deviations from power law (wiggles) in a light curve. In particular we report parameters of broken power law, describe phenomenology, compare optical light curves with X-ray ones and classify the inhomogeneities. We show that the duration of the inhomogeneities correlates with their peak time relative to gamma-ray burst (GRB) trigger and the correlation is the same for all types of inhomogeneities.

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Section: Introductionmentioning

confidence: 99%

Inhomogeneities in the light curves of gamma-ray bursts afterglow

Mazaeva

Pozanenko

Minaev

2018

Int. J. Mod. Phys. D

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The Ultra-Long GRB 111209a. Ii. Prompt to Afterglow and Afterglow Properties

Stratta

Gendre

Atteia

et al. 2013

ApJ

113

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The "ultra-long" Gamma Ray Burst GRB 111209A at redshift z=0.677, is so far the longest GRB ever observed, with rest frame prompt emission duration of ∼ 4 hours. In order to explain the burst exceptional longevity, a low metallicity blue supergiant progenitor has been invoked. In this work, we further constrain the phenomenology and progenitor properties of this peculiar GRB by performing a multi-band temporal and spectral analysis of both the prompt and the afterglow emission. We use proprietary and publicly available data from Swift, Konus Wind, XMM-Newton, TAROT as well as from other ground based optical and radio telescopes. We find some peculiar properties that are possibly connected to the exceptional nature of this burst, namely: i) an unprecedented large optical delay of 410 ± 50 s between the peak time in gamma-rays and the peak time in optical of a marked multiwavelength flare; ii) multiwavelength prompt emission spectral modelling requires a certain amount of dust in the circumburst environment, with rest frame visual dust extinction of A V = 0.3 − 1.5 mag, that may undergo to destruction at late times; iii) we detect the presence of a hard spectral extra power law component at the end of the X-ray steep decay phase and before the start of the X-ray afterglow, which was never revealed so far in past GRBs. The optical afterglow shows more usual properties, with a flux power law decay with index 1.6±0.1 and a late re-brightening feature observed at ∼ 1.1 day after the first BAT trigger. We discuss our findings in the context of several possible interpretations given so far to the complex multi-band GRB phenomenology and propose a binary channel formation for the blue supergiant progenitor.2 Stratta et al.

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Optical and near-infrared flares in GRB afterglows

Cited by 2 publications

References 25 publications

Inhomogeneities in the light curves of gamma-ray bursts afterglow

Inhomogeneities in the light curves of gamma-ray bursts afterglow

The Ultra-Long GRB 111209a. Ii. Prompt to Afterglow and Afterglow Properties

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