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Investigating signatures of cosmological time dilation in duration measures of prompt gamma-ray burst light curves. (arXiv:1408.6525v1 [astro-ph.HE])

August 29th, 2014

O. M. Littlejohns, N. R. Butler

We study the evolution with redshift of three measures of gamma-ray burst
(GRB) duration ($T_{\rm 90}$, $T_{\rm 50}$ and $T_{\rm R45}$) in a fixed rest
frame energy band for a sample of 232 Swift/BAT detected GRBs. Binning the data
in redshift we demonstrate a trend of increasing duration with increasing
redshift that can be modelled with a power-law for all three measures.
Comparing redshift defined subsets of rest-frame duration reveals that the
observed distributions of these durations are broadly consistent with
cosmological time dilation. To ascertain if this is an instrumental effect, a
similar analysis of Fermi/GBM data for the 57 bursts detected by both
instruments is conducted, but inconclusive due to small number statistics. We
then investigate under-populated regions of the duration redshift parameter
space. We propose that the lack of low-redshift, long duration GRBs is a
physical effect due to the sample being volume limited at such redshifts.
However, we also find that the high-redshift, short duration region of
parameter space suffers from censorship as any Swift GRB sample is
fundamentally defined by trigger criteria determined in the observer frame
energy band of Swift/BAT. As a result, we find that the significance of any
evidence for cosmological time dilation in our sample of duration measures
typically reduces to $<2\sigma$.


http://arxiv.org/abs/1408.6525


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The Large Observatory For x-ray Timing. (arXiv:1408.6526v1 [astro-ph.IM])

August 29th, 2014


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The LOFT Burst Alert System and its Burst On-board Trigger. (arXiv:1408.6536v1 [astro-ph.IM])

August 29th, 2014


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The LOFT Ground Segment. (arXiv:1408.6541v1 [astro-ph.IM])

August 29th, 2014


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A search for \textit{Fermi} bursts associated to supernovae and their frequency of occurrence. (arXiv:1408.6227v1 [astro-ph.HE])

August 28th, 2014


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Neutrino Telescope Array Letter of Intent: A Large Array of High Resolution Imaging Atmospheric Cherenkov and Fluorescence Detectors for Survey of Air Showers from Cosmic Tau Neutrinos in the PeV-EeV Energy Range. (arXiv:1408.6244v1 [astro-ph.IM])

August 28th, 2014


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A Small, Rapid Optical-IR Response Gamma-Ray Burst Space Observatory. (arXiv:1402.4856v3 [astro-ph.IM] UPDATED)

August 26th, 2014


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Herschel observations of gamma-ray burst host galaxies: implications for the topology of the dusty interstellar medium. (arXiv:1408.5076v1 [astro-ph.GA])

August 22nd, 2014


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Gamma-ray burst supernovae as standardizable candles. (arXiv:1407.2589v2 [astro-ph.HE] UPDATED)

August 22nd, 2014


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Testing the neutrino annihilation model for launching GRB jets. (arXiv:1408.4509v1 [astro-ph.HE])

August 21st, 2014


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