Table of contents ACROSS Developed Resources The Astrophysics Cross-Observatory Science Support (ACROSS) initiative is developing tools and resources to enhance coordination in time-domain and multimessenger astronomy. Its situational awareness dashboards aggregate real-time data on mission status, scheduling, visibility, and constraints across multiple observatories, giving scientists a centralized view to quickly assess the feasibility of follow-up observations and identify optimal strategies that align with each facility’s capabilities. Complementing these dashboards, ACROSS is also building modern Application Programming Interfaces (APIs) that provide standardized, machine-readable access to mission state, observing plans, and constraints. These APIs enable automated systems to rapidly determine observatory availability, streamline the submission of target of opportunity (ToO) requests, and reduce human latency, ensuring more timely and coordinated responses to transient astrophysical events. Image FEATURED RESOURCEThe ACROSS APIACROSS is developing modern Application Programming Interfaces (APIs) to NASA TDAMM relevant missions. APIs play a critical role in enabling the rapid coordination and responsiveness required for TDAMM astronomy. By providing standardized, machine-readable access to mission state and status, observing plans, and observational constraints, APIs allow automated systems to quickly assess which observatories are available, where they are pointing, and what constraints might affect follow-up observations. Furthermore, APIs for submitting target of opportunity (ToO) requests streamline the process of triggering rapid observations across facilities, reducing human latency and enabling timely data collection in response to transient events. Learn More Contribute Situational Awareness and API Tools TitleDescription ACROSS Mission DashboardThe ACROSS mission dashboard provides a comprehensive view of the state and status of TDAMM relevant NASA observatories.#ACROSS Visibility ToolThe ACROSS visibility tool provides a convenient way to access observing constraints of NASA space-based observatories.#ACROSS API SDKThe ACROSS Software Development Kit provides tools for integrating with the ACROSS API.# Community Developed Tools and Resources The tools listed below are community developed resources that are relevant to the ACROSS initiative to further help facilitate TDAMM astrophysics. Image FEATURED RESOURCEThe General Coordinates NetworkThe General Coordinates Network (GCN) is a public collaboration platform run by NASA for the astronomy research community to share alerts and rapid communications about high-energy, multimessenger, and transient phenomena. GCN is the established platform for publishing discoveries and follow-up of gamma-ray bursts (GRBs), gravitational-wave (GW) compact binary mergers, and high-energy neutrinos. GCN distributes alerts between space- and ground-based observatories, physics experiments, and thousands of astronomers around the world.Visit gcn.nasa.gov Contribute Image FEATURED RESOURCETreasure MapThe Treasure Map is a coordination tool for followup observations of gravitational wave (GW) events with user-reported observations. The Treasure Map enables facilities coordination to quickly and efficiently identify electromagnetic counterpart to GW events.Learn More Real-Time Communication Resources TitleDescription Transient Name ServerThe official IAU mechanism for reporting new astronomical transients, provided by the IAU supernova working group.#The Astronomer's TelegramsEmail notices for the reporting of new astronomical observations of transient sources.#SCiMMA HopscotchA real-time alert service which provides a publish-subscribe capability for Multi-Messenger Astronomy# Data Analysis Toolkits TitleDescription The Multi-Mission Maximum Likelihood framework (3ML)A common high-level interface and model definition for multi-instrument and wavelength analyses.#The Gamma-ray Data Tools (GDT)A Python-based centralized toolkit for analyzing data from space-based hard X-ray and gamma-ray instruments.# Observation Planning Tools TitleDescription NASA/IPAC Extragalactic Database NED captures the most reliable census of extragalactic objects and provide essential data and tools to facilitate astrophysics research#M4OPT: Multi-Mission Multi-Messenger Observation Planning ToolkitAn open-source toolkit for multi-facility scheduling of astrophysics observing campaigns, with a focus on extremely rapid follow-up of gravitational wave and neutrino events.# Online Data Visualization TitleDescription Fermi LAT Light Curve Repository (LCR)A database of multi-cadence flux calibrated lightcurves for variable sources observed by the Fermi Large Area Telescope.#Fermi All-sky Variability Analysis (FAVA)A catalog of flaring sources observed by the Fermi Large Area Telescope.# Libraries and Modules TitleDescription AstroPyA community-developed core Python package for Astronomy.#mhealpyObject-oriented wrapper of healpy.#HEALPix-alchemyAn Python implementation of a set of methods that enables rapid all-sky geometry calculations. # FEEDBACKWhat to see your project listed here?We're always looking for great new projects to highlight.Contact Us