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# Short gamma-ray bursts at the dawn of the gravitational wave era

Astronomy & Astrophysics

EDP Sciences

ScienceOpenPublisher
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### Most cited references89

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### Nucleosynthesis, neutrino bursts and γ-rays from coalescing neutron stars

(1989)
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### BATSE observations of gamma-ray burst spectra. I - Spectral diversity

(1993)
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### GW151226: Observation of Gravitational Waves from a 22-Solar-Mass Binary Black Hole Coalescence

We report the observation of a gravitational-wave signal produced by the coalescence of two stellar-mass black holes. The signal, GW151226, was observed by the twin detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO) on December 26, 2015 at 03:38:53 UTC. The signal was initially identified within 70 s by an online matched-filter search targeting binary coalescences. Subsequent off-line analyses recovered GW151226 with a network signal-to-noise ratio of 13 and a significance greater than 5 $$\sigma$$. The signal persisted in the LIGO frequency band for approximately 1 s, increasing in frequency and amplitude over about 55 cycles from 35 to 450 Hz, and reached a peak gravitational strain of $$3.4_{-0.9}^{+0.7} \times 10^{-22}$$. The inferred source-frame initial black hole masses are $$14.2_{-3.7}^{+8.3} M_{\odot}$$ and $$7.5_{-2.3}^{+2.3} M_{\odot}$$ and the final black hole mass is $$20.8_{-1.7}^{+6.1} M_{\odot}$$. We find that at least one of the component black holes has spin greater than 0.2. This source is located at a luminosity distance of $$440_{-190}^{+180}$$ Mpc corresponding to a redshift $$0.09_{-0.04}^{+0.03}$$. All uncertainties define a 90 % credible interval. This second gravitational-wave observation provides improved constraints on stellar populations and on deviations from general relativity.
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### Author and article information

###### Journal
Astronomy & Astrophysics
A&A
EDP Sciences
0004-6361
1432-0746
October 2016
October 14 2016
October 2016
: 594
: A84
###### Article
10.1051/0004-6361/201628993