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First Demonstration of Early Warning Gravitational-wave Alerts

Magee, Ryan and Chatterjee, Deep and Singer, Leo P. and Sachdev, Surabhi and Kovalam, Manoj and Mo, Geoffrey and Anderson, Stuart and Brady, Patrick and Brockill, Patrick and Cannon, Kipp and Dal Canton, Tito and Chu, Qi and Clearwater, Patrick and Codoreanu, Alex and Drago, Marco and Godwin, Patrick and Ghosh, Shaon and Greco, Giuseppe and Hanna, Chad and Kapadia, Shasvath J. and Katsavounidis, Erik and Oloworaran, Victor and Pace, Alexander E. and Panther, Fiona and Patwary, Anwarul and De Pietri, Roberto and Piotrzkowski, Brandon and Prestegard, Tanner and Rei, Luca and Sreekumar, Anala K. and Szczepańczyk, Marek J. and Valsan, Vinaya and Viets, Aaron and Wade, Madeline and Wen, Linqing and Zweizig, John (2021) First Demonstration of Early Warning Gravitational-wave Alerts. Astrophysical Journal Letters, 910 (2). Art. No. L21. ISSN 2041-8213. doi:10.3847/2041-8213/abed54.

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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.

Item Type:Article
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URLURL TypeDescription Paper InCaltech News
Magee, Ryan0000-0001-9769-531X
Chatterjee, Deep0000-0003-0038-5468
Singer, Leo P.0000-0001-9898-5597
Sachdev, Surabhi0000-0002-0525-2317
Kovalam, Manoj0000-0001-8143-9696
Mo, Geoffrey0000-0001-6331-112X
Brady, Patrick0000-0002-4611-9387
Cannon, Kipp0000-0003-4068-6572
Dal Canton, Tito0000-0001-5078-9044
Ghosh, Shaon0000-0003-4259-8592
Kapadia, Shasvath J.0000-0001-5318-1253
Wen, Linqing0000-0001-7987-295X
Zweizig, John0000-0002-1521-3397
Additional Information:© 2021. The American Astronomical Society. Received 2021 February 25; accepted 2021 March 10; published 2021 April 6. We are grateful to B.S. Sathyaprakash for reviewing our manuscript and providing useful comments. We thank the LIGO Laboratory for use of its computing facility to make this work possible, and we gratefully acknowledge the support of the National Science Foundation (NSF) grants PHY-0757058 and PHY-0823459. C.H. gratefully acknowledges the support of NSF grant OAC-1841480. D.C. acknowledges NSF grant No. PHY-1700765 and PHY-1912649, and is supported by the Illinois Survey Science Fellowship of the Center for Astrophysical Surveys (CAPS) at the University of Illinois Urbana-Champaign. S.S. is supported by the Eberly Research Funds of Penn State, The Pennsylvania State University, University Park, Pennsylvania. G.M. is supported by the NSF through award PHY-1764464 to the LIGO Laboratory. M.K., Q.C., F.P., L.W., A.P., A.S., and V.O. acknowledge the funding from Australian Research Council (ARC) Centre of Excellence for Gravitational Wave Discovery OzGrav under grant CE170100004. Facilities: LIGO - Laser Interferometer Gravitational-Wave Observatory, EGO:Virgo. - Software: astropy (Astropy Collaboration et al. 2013), numpy (Harris et al. 2020), matplotlib (Hunter 2007), iPython (Perez & Granger 2007), pandas (McKinney 2010), gwpy (Macleod et al. 2020), celery (Solem 2020).
Funding AgencyGrant Number
University of Illinois Urbana-ChampaignUNSPECIFIED
Eberly College of ScienceUNSPECIFIED
Pennsylvania State UniversityUNSPECIFIED
Australian Research CouncilCE170100004
Subject Keywords:Gravitational waves; Gravitational wave astronomy; Neutron stars; High energy astrophysics
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Gravitational waves (678); Gravitational wave astronomy (675); Neutron stars (1108); High energy astrophysics (739)
Record Number:CaltechAUTHORS:20210406-141403253
Persistent URL:
Official Citation:Ryan Magee et al 2021 ApJL 910 L21
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:108635
Deposited By: Tony Diaz
Deposited On:07 Apr 2021 23:33
Last Modified:10 Mar 2023 23:32

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