Understanding Gamma Rays in our Universe through StarBurst

WASHINGTON, D.C.  –   The U.S. Naval Research Laboratory (NRL), in partnership with NASA’s Marshall Space Flight Center (MSFC), has developed StarBurst, a small satellite (SmallSat) instrument for NASA's StarBurst Multimessenger Pioneer mission, which will detect the emission of short gamma-ray bursts (GRBs), a key electromagnetic (EM) signature that will contribute to the understanding of neutron star (NS) mergers.

NRL transferred the instrument to NASA on March 4 for the next phase, environmental testing. From there, the instrument will be integrated onto the spacecraft bus, followed by launch into Low Earth Orbit in 2027. StarBurst will be installed as a secondary payload via the Evolved Expendable Launch Vehicle Secondary Payload Adapter Grande interface with a mission duration of one year, with the option of extension.

"StarBurst represents a significant leap forward in gamma-ray astronomy," said Richard S. Woolf, Ph.D., research physicist with NRL’s Space Science Division. "Our team at NRL has drawn upon years of expertise in detector development to create an instrument that is both highly sensitive and cost-effective. StarBurst will play a critical role in the exciting new era of multimessenger astronomy, allowing us to study neutron star mergers in unprecedented detail."

NS collisions are significant cosmic events and are recently understood as major producers of heavy elements such as gold and uranium. This process, known as nucleosynthesis, involves the formation of new atomic nuclei and occurs in various astrophysical settings, including neutron star mergers, supernovae, stellar burning, and the Big Bang.

The StarBurst Multimessenger Pioneer is a wide-field gamma-ray observatory focused on detecting short-duration bursts of gamma-rays that are produced following NS mergers that are observed via the gravitational waves that they produce. The combination of the gamma-ray and gravitational-wave signals provides fundamental insight into the parent stars and the physics of these extreme explosions. With an effective area four times greater than the Fermi Gamma-ray Burst Monitor – the most sensitive monitor currently on orbit – it will provide full coverage of the unobscured sky. The enhanced sensitivity due to the large collecting area of the telescope will make StarBurst a vital partner to the gravitational wave network. This will significantly increase the detection rate of EM counterparts to NS mergers at a fraction of the cost of current gamma-ray missions. 
 
The fundamental properties of the gamma-ray bursts measured by StarBurst will give scientists a representative picture of the ensemble properties of remnant explosions following NS mergers, for the first time.
 
The StarBurst Sensor Head comprised of 12 thallium-doped cesium iodide (CsI:Tl) scintillation detectors, each utilizing a custom array of low-mass, low-voltage silicon photomultipliers (SiPMs), is designed to allow StarBurst to detect GRBs in an energy range from 50 keV to 2000 keV, optimizing its sensitivity.

The instrument's design is inspired by NRL's successful technology demonstrator, Glowbug, led by J. Eric Grove, Ph.D., NRL Space Science Division Acting Superintendent, which recently concluded a highly productive mission on the International Space Station, detecting numerous GRBs and contributing to important astrophysical research.

StarBurst is a collaborative effort. MSFC leads the mission and partners with NRL, the University of Alabama Huntsville, the Universities Space Research Association, and the University of Toronto Institute for Aerospace Studies Space Flight Laboratory.

NRL's contributions to StarBurst build upon the success of Glowbug, demonstrating the laboratory's commitment to advancing space-based scientific research. The StarBurst mission promises to unlock new insights into the universe's most energetic events and to further solidify NRL's leadership in cutting-edge space technology.
 
About the U.S. Naval Research Laboratory
NRL is a scientific and engineering command dedicated to research that drives innovative advances for the U.S. Navy and Marine Corps from the seafloor to space and in the information domain. NRL is located in Washington, D.C. with major field sites in Stennis Space Center, Mississippi; Key West, Florida; Monterey, California, and employs approximately 3,000 civilian scientists, engineers and support personnel.
 
For more information, contact NRL Corporate Communications at (202) 480-3746 or nrlpao@nrl.navy.mil. Please reference package number at top of press release.