Preprint

4th TDAMM Workshop White Paper

Daniel KocevskiRaffaella MarguttiMichael CoughlinChristopher FryerLos Alamos National LaboratoryKate AlexanderIgor Lorenzo AndreoniDepartment of Physics and Astronomy , University of North Carolina at Chapel HillJ. L. AtteiaCentre National d'Études SpatialesE. AydiDepartment of Physics and Astronomy , Texas Tech UniversityMatthew BARINGDepartment of Physics and Astronomy , Rice UniversityJoe BrightAstrophysics , Department of Physics , University of OxfordEric BurnsBrad CenkoNASA Goddard Space Flight CenterSanjana CurtisDepartment of Physics , Oregon State UniversityFabio DeColleInstituto de Ciencias Nucleares , Universidad Nacional Autónoma de MéxicoCourey ElliottDepartment of Physics & Astronomy , Louisiana State UniversityC. FletcherUniversities Space Research AssociationAnna FranckowiakCarla Fr"ohlichadam goldsteinA. HabigDepartment of Physics and Astronomy , University of Minnesota DuluthErica HammersteinA. Y. Q. HoDepartment of Astronomy , Cornell University 20 Las Cumbres ObservatoryD. Andrew HowellDepartment of Physics , University of California , Santa BarbaraChin-Ping HuDepartment of Physics , National Changhua University of EducationXiaoshan HuangTheoretical Astrophysics , California Institute of TechnologyC. M. HuiNASA Marshall Space Flight CenterBrian HumenskyNASA Marshall Space Flight CenterJamie KenneaAli KheirandishDepartment of Physics & Astronomy , University of Nevada , Las Vegas 26R. LauM. Coleman MillerBrenna MocklerMichela NegroJan-Uwe NessEuropean Space Astronomy Centre , European Space Agency 30 McWilliams Center for Cosmology and Astrophysics ,Brendan O'ConnorKim PageSchool of Physics & Astronomy , University of LeicesterTyler PritchardNASA Goddard Space Flight CenterJudith RacusinDavid RadiceChristopher RobertsNASA Goddard Space Flight CenterDave RussellCenter for Astrophysics and Space Science , New York University Abu DhabiDave SandSteward Observatory , University of ArizonaPeter ShawhanDepartment of Physics , University of MarylandRachel StreetAlexander van der HorstJustin VandenbrouckeDepartment of Physics , University of Wisconsin-MadisonZorawar WadiasinghNASA Goddard Space Flight CenterYuhan YaoDepartment of Physics , Carnegie Mellon UniversityGeorge YounesNASA Goddard Space Flight Center

2026

ABI

Annotatsiya

Time-Domain and Multi-Messenger Astrophysics (TDAMM) is entering a new era in which the rate and diversity of transient discoveries will grow rapidly across electromagnetic, gravitational-wave, neutrino, and cosmic-ray facilities. The scientific return from these investments will increasingly depend not on discovery alone, but on the ability to identify, prioritize, and coordinate follow-up observations across a heterogeneous and globally distributed network of observatories. This white paper summarizes the outcomes of the Fourth TDAMM Workshop and assesses the near-term discovery landscape, the infrastructure and tools that support coordinated observations, and the technical, policy, and capability gaps that may limit future progress. The workshop identified three principal challenges: insufficiently scalable and interoperable alert and coordination infrastructure, policies that impede rapid multi-facility observations and rare-event science, and the potential loss of critical high-energy, rapid-response, and spectroscopic capabilities. The white paper identifies the need for sustained support for alert distribution, brokers, standardized observatory metadata, cross-facility coordination platforms, and unified follow-up repositories; expanded joint observing opportunities and funding mechanisms for coordinated analysis; and strategic investment in future TDAMM facilities. The white paper also present a framework for community observing plans that would establish pre-coordinated responses to rare, high-impact events, supported by transparent governance, immediate public data release, and regular community revision. Science overviews and detailed observing strategies are provided for gamma-ray bursts, tidal disruption events, X-ray binaries, novae, supernovae, magnetars, compact binary mergers, and high-energy neutrino sources.

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