2 research outputs found
Low-latency Gravitational-wave Alerts for Multimessenger Astronomy during the Second Advanced LIGO and Virgo Observing Run
Get PDFAdvanced LIGO's second observing run (O2), conducted from November 30, 2016
to August 25, 2017, combined with Advanced Virgo's first observations in August
2017 witnessed the birth of gravitational-wave multi-messenger astronomy. The
first ever gravitational-wave detection from the coalescence of two neutron
stars, GW170817, and its gamma-ray counterpart, GRB 170817A, led to an
electromagnetic follow-up of the event at an unprecedented scale. Several teams
from across the world searched for EM/neutrino counterparts to GW170817, paving
the way for the discovery of optical, X-ray, and radio counterparts. In this
article, we describe the online identification of gravitational-wave transients
and the distribution of gravitational-wave alerts by the LIGO and Virgo
collaborations during O2. We also describe the gravitational-wave observables
which were sent in the alerts to enable searches for their counterparts.
Finally, we give an overview of the online candidate alerts shared with
observing partners during O2. Alerts were issued for 14 candidates, six of
which have been confirmed as gravitational-wave events associated with the
merger of black holes or neutron stars. Eight of the 14 alerts were issued less
than an hour after data acquisition.Comment: 27 pages, 5 figures, 3 tables, accepted for publication in the
Astrophysical Journa
The NOvA Technical Design Report
No full textThis Technical Design Report (TDR) describes the preliminary design of the NOνA accelerator upgrades, NOνA detectors, detector halls and detector sites. Compared to the March 2006 and November 2006 NOνA Conceptual Design Reports (CDR), critical value engineering studies have been completed and the alternatives still active in the CDR have been narrowed to achieve a preliminary technical design ready for a Critical Decision 2 review. Many aspects of NOνA described this TDR are complete to a level far beyond a preliminary design. In particular, the access road to the NOvA Far Detector site in Minnesota has an advanced technical design at a level appropriate for a Critical Decision 3a review. Several components of the accelerator upgrade and new neutrino detectors also have advanced technical designs appropriate for a Critical Decision 3a review
