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Time-Domain And Multi-Messenger Astrophysics
Communications Science Analysis Group


Space-based astrophysics requires that missions be able to downlink data to the ground. In the burgeoning field of time domain and multi-messenger astrophysics (TDAMM), the science drives the frequency of this communication both for downlinking data and uplinking commands. In the last few decades, NASA has provided a wide array of options for communications, including Near Space Network (NSN), which is composed of Direct-to-Earth (DTE) ground stations for communicating with missions in near-Earth orbits; the Space Relay (SR), which operates a fleet of geostationary satellites known as the Tracking and Data Relay Satellite System (TDRSS); and finally the Deep Space Network (DSN) for communicating with missions at larger distances (e.g., Planetary Distances, Lagrange points).

The current fleet of rapidly-communicating TDAMM missions (e.g., Fermi, Swift, NICER) have utilized TDRSS assets to perform low-latency alerts and commanding that have enabled transformational TDAMM science. However, in the future it has been communicated that TDRSS will be decommissioned and replaced by a commercial service by 2030, with some period of overlap. The goal of this SAG is to, based on the science drivers, define requirements for comms systems to enable rapid commanding and downlinking of data for future NASA TDAMM missions.

The SAG will consider various questions relating to how future communications solutions can be developed to better support TDAMM missions. These questions include looking at the science drivers that will define future comms needs; the needs for missions in a variety of orbits; looking into bandwidth and latency requirements for future TDAMM missions; the issue of cost of comms for TDAMM missions; the need for high availability and flexible scheduling of comms; and how the future of communications can be better advertised to proposers.

Related Documents

  • APAC approval letter [PDF]
  • Terms of Reference (TOR) [PDF]

TDAMMComm SAG Team Organization

Co-Chairs: Jamie Kennea (Penn State), Judy Racusin (NASA GSFC)

TDAMM Comm SAG Meetings

  • Non-LEO Orbits: Advantages and Disadvantages for TDAMM Missions
    Tuesday, September 19th, 11 am – 12 pm (EDT)

Previous Meetings

How to Join the TDAMMComm SAG

The TDAMMComm SAG welcomes input from community stakeholders, including those involved in mission concepts currently in development.

If you’re interested in joining the TDAMMComm SAG, please fill out this form by June 19th, 2023.

JAXA, NASA XRISM Mission Ready for Liftoff

XRISM launched successfully on Wednesday, Sept. 6, 2023, at 7:42 p.m. EDT (Thursday, Sept. 7, 8:42 a.m. in Japan). The spacecraft separated from the rocket at 7:56 p.m. EDT.Read more.

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