On January 26, 2026, astronomers achieved a significant advancement in time-domain astronomy with the Submillimeter Array on Maunakea. Researchers from the Center for Astrophysics at Harvard and Smithsonian successfully demonstrated a novel rapid-response capability, capturing the earliest observations of a gamma-ray burst at millimeter and submillimeter wavelengths. This breakthrough, published in The Astrophysical Journal Letters, marks the inaugural application of such technology for tracking these cosmic phenomena at radio frequencies within minutes of detection.
Gamma-ray bursts constitute the most luminous explosions in the universe, generated when massive stellar cores collapse or when compact objects such as neutron stars undergo merger events. While X-ray and optical facilities have long been capable of rapid follow-up observations, millimeter-wave telescopes have historically lagged behind. The SMA addressed this limitation through integration with NASA's Neil Gehrels Swift Observatory's automated alert system. Upon detection of the gamma-ray event, the response was initiated within 90 seconds, with the telescope repositioned within four minutes—almost entirely without human intervention.
Garrett Keating, deputy director of the SMA, characterized the real-time observation capability as a substantial departure from conventional operational paradigms. Ranjani Srinavasan, interim director, noted that interferometric imaging typically requires extended processing pipelines to generate usable images. The demonstrated response time of approximately 13 minutes represents two orders of magnitude improvement over conventional millimeter and submillimeter telescope capabilities, with potential for further optimization to achieve response times of 2-3 minutes.