The Submillimeter Array (SMA) on Hawaii's Maunakea has achieved a breakthrough in time-domain astronomy by detecting a gamma-ray burst within minutes of its initial discovery. On January 26, 2026, researchers from the Center for Astrophysics (CfA) at Harvard and the Smithsonian deployed a newly developed rapid-response system that allowed the facility to observe the cosmic eruption at millimeter and submillimeter wavelengths faster than ever before.
Gamma-ray bursts are among the universe's most violent explosions, releasing energy equivalent to billions of suns in seconds. Catching them early matters enormously because the burst's initial phase contains clues about its source and mechanism. Previous observations at these wavelengths typically arrived too late to capture the earliest moments. The SMA's new system collapsed that response time to minutes, marking the first time submillimeter observations have been obtained during a burst's nascent phase.
The team captured data at frequencies that probe the burst's cooling electrons and expanding debris. These wavelengths reveal information complementary to gamma-ray and X-ray observations, offering a more complete picture of the explosion's physics. The rapid dataset will help astronomers understand how gamma-ray bursts release their tremendous energy and what triggers them.
The CfA team published their findings in The Astrophysical Journal Letters, detailing both the burst observations and the technical upgrades that made rapid response possible. The system required improvements to the SMA's data acquisition, analysis, and alert distribution pipelines. Engineers streamlined communication between the facility and automated trigger systems that can slew the array to a new target quickly.
This capability opens a new window for transient astronomy. Future observations of gamma-ray bursts, kilonovae from neutron star mergers, and other transient events promise insights into fundamental physics. The demonstration also