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  • 1
    Online Resource
    Online Resource
    First Demonstration of Early Warning Gravitational-wave Alerts
    American Astronomical Society ; 2021
    In:  The Astrophysical Journal Letters Vol. 910, No. 2 ( 2021-04-01), p. L21-
    Details
    In: The Astrophysical Journal Letters, American Astronomical Society, Vol. 910, No. 2 ( 2021-04-01), p. L21-
    Abstract: Gravitational-wave observations became commonplace in Advanced LIGO-Virgo’s recently concluded third observing run. 56 nonretracted candidates were identified and publicly announced in near real time. Gravitational waves from binary neutron star mergers, however, remain of special interest since they can be precursors to high-energy astrophysical phenomena like γ -ray bursts and kilonovae. While late-time electromagnetic emissions provide important information about the astrophysical processes within, the prompt emission along with gravitational waves uniquely reveals the extreme matter and gravity during—and in the seconds following—merger. Rapid communication of source location and properties from the gravitational-wave data is crucial to facilitate multimessenger follow-up of such sources. This is especially enabled if the partner facilities are forewarned via an early warning (pre-merger) alert. Here we describe the commissioning and performance of such a low-latency infrastructure within LIGO-Virgo. We present results from an end-to-end mock data challenge that detects binary neutron star mergers and alerts partner facilities before merger. We set expectations for these alerts in future observing runs.
    Type of Medium: Online Resource
    ISSN: 2041-8205 , 2041-8213
    URL: Article
    DOI: 10.3847/2041-8213/abed54
    Language: Unknown
    Publisher: American Astronomical Society
    Publication Date: 2021
    detail.hit.zdb_id: 2207648-7
    detail.hit.zdb_id: 2006858-X
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  • 2
    Online Resource
    Online Resource
    Modeling spurious forces on the LISA spacecraft across a full solar cycle
    IOP Publishing ; 2020
    In:  Classical and Quantum Gravity Vol. 37, No. 17 ( 2020-09-03), p. 175007-
    Details
    In: Classical and Quantum Gravity, IOP Publishing, Vol. 37, No. 17 ( 2020-09-03), p. 175007-
    Type of Medium: Online Resource
    ISSN: 0264-9381 , 1361-6382
    URL: Article
    DOI: 10.1088/1361-6382/ab9bba
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1473117-4
    SSG: 16,12
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  • 3
    Online Resource
    Online Resource
    Deep Multimessenger Search for Compact Binary Mergers in LIGO, Virgo, and Fermi/GBM Data from 2016–2017
    American Astronomical Society ; 2023
    In:  The Astrophysical Journal Vol. 956, No. 1 ( 2023-10-01), p. 56-
    Details
    In: The Astrophysical Journal, American Astronomical Society, Vol. 956, No. 1 ( 2023-10-01), p. 56-
    Abstract: GW170817–GRB 170817A provided the first observation of gravitational waves from a neutron star merger with associated transient counterparts across the entire electromagnetic spectrum. This discovery demonstrated the long-hypothesized association between short gamma-ray bursts and neutron star mergers. More joint detections are needed to explore the relation between the parameters inferred from the gravitational wave and the properties of the gamma-ray burst signal. We developed a joint multimessenger analysis of LIGO, Virgo, and Fermi/GBM data designed for detecting weak gravitational-wave transients associated with weak gamma-ray bursts. As such, it does not start from confident (GWTC-1) events only. Instead, we take the full list of existing compact binary coalescence triggers generated with the PyCBC pipeline from the second Gravitational-Wave Observing Run (O2), and reanalyze the entire set of public Fermi/GBM data covering this observing run to generate a corresponding set of gamma-ray burst candidate triggers. We then search for coincidences between the gravitational-wave and gamma-ray burst triggers without requiring a confident detection in any channel. The candidate coincidences are ranked according to a statistic combining each candidate’s strength in gravitational-wave and gamma-ray data, their time proximity, and the overlap of their sky localization. The ranking is then converted to a false alarm rate using time shifts between the gravitational-wave and gamma-ray burst triggers. We present the results using O2 triggers, which allowed us to check the validity of our method against GW170817–GRB 170817A. We also discuss the different configurations tested to maximize the significance of the joint detection.
    Type of Medium: Online Resource
    ISSN: 0004-637X , 1538-4357
    URL: Article
    DOI: 10.3847/1538-4357/acf458
    RVK:
    UA 1000
    Language: Unknown
    Publisher: American Astronomical Society
    Publication Date: 2023
    detail.hit.zdb_id: 2207648-7
    detail.hit.zdb_id: 1473835-1
    SSG: 16,12
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  • 4
    Online Resource
    Online Resource
    Current observations are insufficient to confidently associate the binary black hole merger GW190521 with AGN J124942.3 + 344929
    IOP Publishing ; 2021
    In:  Classical and Quantum Gravity Vol. 38, No. 23 ( 2021-12-03), p. 235004-
    Details
    In: Classical and Quantum Gravity, IOP Publishing, Vol. 38, No. 23 ( 2021-12-03), p. 235004-
    Abstract: Recently, Graham et al (2020 arXiv: 2006.14122 ) identified ZTF19abanrhr as a candidate electromagnetic counterpart to the binary black hole merger GW190521. The authors argue that the observations are consistent with a kicked binary black hole interacting with the accretion disk of the active galactic nucleus AGN J124942.3 + 344929. If a real association (rather than happenstance), this has implications for the sources of LIGO/Virgo binary mergers, future prospects for electromagnetic counterparts, and measurements of the expansion rate of the Universe. In this work, we provide an analysis of the multi-messenger coincident-significance based on the localisation overlap and find that, under optimistic assumptions, the odds of a common source for GW190521 and ZTF19abanrhr range between 1 and 12. These odds are strongly dependent on the waveform model and, with current models, are unable to consistently capture both the effects of precession and orbital eccentricity. We consider this insufficient evidence to warrant confidently associating GW190521 with ZTF19abanrhr and hence caution against any astrophysical conclusions based on the association.
    Type of Medium: Online Resource
    ISSN: 0264-9381 , 1361-6382
    URL: Article
    DOI: 10.1088/1361-6382/ac33bb
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 1473117-4
    SSG: 16,12
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  • 5
    Online Resource
    Online Resource
    A joint ranking statistic for multi-messenger astronomical searches with gravitational waves
    IOP Publishing ; 2022
    In:  Classical and Quantum Gravity Vol. 39, No. 8 ( 2022-04-21), p. 085010-
    Details
    In: Classical and Quantum Gravity, IOP Publishing, Vol. 39, No. 8 ( 2022-04-21), p. 085010-
    Abstract: Joint ranking statistics are used to distinguish real from random coincidences, ideally considering whether shared parameters are consistent with each other as well as whether the individual candidates are distinguishable from noise. We expand on previous works to include additional shared parameters, we use galaxy catalogues as priors for sky localization and distance, and avoid some approximations previously used. We develop methods to calculate this statistic both in low-latency using HEALPix sky maps, as well as with posterior samples. We show that these changes lead to a factor of one to two orders of magnitude improvement for GW170817-GRB 170817A depending on the method used, placing this significant event further into the foreground. We also examined the more tenuous joint candidate GBM-GW150914, which was largely penalized by these methods. Finally, we performed a simplistic simulation that argues these changes could better help distinguish between real and random coincidences in searches, although more realistic simulations are needed to confirm this.
    Type of Medium: Online Resource
    ISSN: 0264-9381 , 1361-6382
    URL: Article
    DOI: 10.1088/1361-6382/ac5c00
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 1473117-4
    SSG: 16,12
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  • 6
    Online Resource
    Online Resource
    Testing Ranking Statistics for Joint Gravitational Wave and Gamma-Ray Burst Searches
    Wisconsin Space Grant Consortium ; 2022
    In:  Proceedings of the Wisconsin Space Conference Vol. 1, No. 1 ( 2022-02-25)
    Details
    In: Proceedings of the Wisconsin Space Conference, Wisconsin Space Grant Consortium, Vol. 1, No. 1 ( 2022-02-25)
    Abstract: Joint searches looking for associations between gravitational waves and gamma-ray bursts use ranking statistics toseparate real from random coincidences. However, there is no clear choice of which ranking statistics are more useful.We perform a simulated joint search simulating gravitational waves from the LIGO-Virgo-KAGRA (LVK) collabo-ration and Fermi-GBM gamma-ray candidates from the third operating run of LVK. We find evidence that rankingstatistics that include more information on the significance of the individual candidates perform better, although morerealistic data is needed to confirm this.
    Type of Medium: Online Resource
    ISSN: 2374-8885 , 2374-8877
    URL: Article
    DOI: 10.17307/wsc.v1i1.350
    Language: Unknown
    Publisher: Wisconsin Space Grant Consortium
    Publication Date: 2022
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