Semianalytical approach for sky localization of gravitational waves

Hu, Qian; Zhou, Cong; Peng, J.-H.; Wen, L.; Chu, Q.; Kovalam, M.

doi:10.1103/physrevd.104.104008

Cited by 1 publication

(3 citation statements)

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“…where the likelihood function appears as a Gaussian in the matrix A and is therefore analytically tractable (Hu et al 2021). The posterior of the source sky location takes the form…”

Section: Localization For Long Signalsmentioning

confidence: 99%

“…where ρ(t c ) is the S/N time series. The analytical expression of I(ρ(t c ), α, δ), including a comprehensive introduction and tests of SealGW, can be found in Hu et al (2021).…”

Section: Localization For Long Signalsmentioning

confidence: 99%

“…For instance, Magee et al (2021) demonstrated ∼0.5 s of computation time of Bayestar with sufficient (>100) threads for early-warning triggers, and ∼1.1 s for full-bandwidth triggers. In this work, to reduce the computational cost of dealing with vast number of events, we will make use of a semianalytical localization algorithm for GWs (SealGW; Hu et al 2021) that has recently been implemented in the SPIIR detection pipeline (Chu et al 2022) and is publicly available. 1 SealGW performs a semianalytical marginalization over nuisance parameters, achieves a faster performance than Bayestar, and retains a reasonable accuracy.…”

Section: Introductionmentioning

confidence: 99%

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Rapid Premerger Localization of Binary Neutron Stars in Third-generation Gravitational-wave Detectors

Hu,

Veitch

2023

ApJL

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Premerger localization of binary neutron stars (BNSs) is one of the most important scientific goals for the third-generation (3G) gravitational-wave detectors. It will enable the electromagnetic observation of the whole process of BNS coalescence, especially for the premerger and merger phases, which have not been observed yet, opening a window for deeper understandings of compact objects. To reach this goal, we describe a novel combination of multiband matched filtering and semianalytical localization algorithms to achieve early-warning localization of long BNS signals in 3G detectors. Using our method we are able to efficiently simulate one month of observations with a three-detector 3G network, and show that it is possible to provide accurate sky localizations more than 30 minutes before the merger. Our simulation shows that there could be ∼10 (∼100) BNS events localized within 100 deg2, 20 (6) minutes before merger, per month of observation.

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“…where the likelihood function appears as a Gaussian in the matrix A and is therefore analytically tractable (Hu et al 2021). The posterior of the source sky location takes the form…”

Section: Localization For Long Signalsmentioning

confidence: 99%

“…where ρ(t c ) is the S/N time series. The analytical expression of I(ρ(t c ), α, δ), including a comprehensive introduction and tests of SealGW, can be found in Hu et al (2021).…”

Section: Localization For Long Signalsmentioning

confidence: 99%