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How NASA Chases and Investigates Bright Cosmic Blips


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How NASA Chases and Investigates Bright Cosmic Blips

A dying star is shown with two jets emerging from it against a red hazy circle
Astronomers think a long GRB (gamma-ray burst) arises from a massive, rapidly rotating star when its core runs out of fuel and collapses, forming a black hole in the star’s center. In this artist’s concept, two jets emerge from the dying star and interact with surrounding gas and dust.
NASA’s Goddard Space Flight Center Conceptual Image Lab

Stephen Lesage’s phone started vibrating just after halftime on Oct. 9, 2022, while he was watching a soccer game in Atlanta with a friend. When Lesage saw the incoming messages, the match no longer seemed important. There had been a rare cosmic event, and he needed to get to his computer immediately.

NASA’s Fermi Gamma-Ray Satellite and Neil Gehrels Swift Observatory had spotted an unusually bright signal in space, and sent automatic alerts to scientists. Lesage’s team’s Fermi chat channel lit up with messages as scientists coordinated their follow-up strategy.

“Everyone in that group was like, ‘this thing’s crazy! Who’s on duty to analyze this? This is what we’ve been waiting for,’” Lesage, a graduate student at the University of Alabama, Huntsville, recalled. “Time to go!”

The unusual event turned to be a cosmic burst that may have been the brightest at X-ray and gamma-ray energies since civilization began. Astronomers dubbed it the BOAT, “the brightest of all time.” Lesage led an analysis of Fermi data that demonstrated just how bright the BOAT really was. More than 150 telescopes in space and on Earth followed up to get more details of the event including NASA’s IXPE (Imaging X-ray Polarimetry Explorer ), Hubble Space Telescope, and James Webb Space Telescope, as well as the European Space Agency’s XMM-Newton telescope.

The Universe is Changing

The BOAT is an example of what astronomers call Time-Domain and Multi-Messenger Astronomy. The “Time Domain” part refers to events that happen in the universe that telescopes can observe as they unfold, such as a supernova or the merger of two neutron stars. “Multimessenger Astronomy” refers to the variety of “messengers” that deliver information from the universe, including all forms of light, high-energy particles, and ripples in spacetime called gravitational waves.

While the universe may seem like it changes extremely slowly, over millions or even billions of years, its celestial occupants do sometimes produce dramatic changes on the order of days or even fractions of seconds. Galactic centers brighten as their central black holes eat material. Black holes siphon plasma from nearby stars. Stars explode. Neutron stars collide with black holes, neutron stars collide with neutron stars, and black holes merge with black holes. Even distant crashes of celestial objects can send powerful ripples that can be detected by space and ground-based telescopes and instruments. Many of these phenomena are unpredictable in terms of both where and when they might happen next.

NASA has two “watchdog” satellites with wide fields of view that send out alerts when they detect a sudden brightening of gamma rays: Fermi and Swift. Fermi’s Gamma-Ray Burst Monitor and Large Area Telescope, and Swift’s Burst Alert Telescope, are key instruments that might be the first to observe these events.

“When something impulsive happens, when something goes boom and explodes or something goes crunch and collapses, they trigger,” said Valerie Connaughton, who leads the high-energy astrophysics portfolio and the Time-Domain and Multimessenger Astronomy Initiative within the Astrophysics Division at NASA’s Headquarters in Washington.

Once scientists receive an alert on their computers and phones, they may be able to collaborate with other telescopes to follow up on the event. By using a variety of different space-based observatories and instruments to study these largely unpredictable flashes, scientists can piece together what, where, when, and why they observed a “blip” in the usual calm of space.

After comparing observations of the BOAT from numerous telescopes, scientists determined that this unusually bright burst came from a supernova and specifically, the core collapse of a massive star rotating rapidly. Later, with data from NASA’s NuSTAR mission, scientists found that the jet of material shooting out from the exploding star had a more complicated shape than they originally thought.

A giant star just exploded, and we get to study it and figure out what happened, and reverse engineer the pieces and put it back together,” Lesage said.

Time-domain astronomy lets us gets fundamental answers on the properties of the universe, of fundamental physics itself, and the origin of the elements.”

ERIC BURNS

ERIC BURNS

Astrophysicist, Louisiana State University

New Bright Signals

Just five months after the BOAT, scientists received an alert from Fermi about the second-brightest gamma-ray burst seen in the last 50 years. This newer signal, GRB 230307A, which happened in March 2023, joined the BOAT in the category of “long” gamma ray bursts, lasting 200 seconds, compared to 600 for the BOAT. Thanks to infrared data from NASA’s James Webb Space Telescope, scientists determined that GRB 230307A may have had a very different origin: the merger of two neutron stars about a billion light-years away from Earth. What’s more, Webb detected the rare element tellurium, suggesting that neutron star mergers create heavy elements like this.

This result still puzzles astronomers such as Eric Burns, a co-author of the GRB 230307A paper and member of the Fermi team at Louisiana State University. Merging neutron stars shouldn’t produce such long gamma-ray bursts, and current models of atomic physics do not entirely explain the mid-infrared wavelengths that Webb detected. He hopes Webb will help us learn more about these kinds of events in the next few years.

“Time-domain astronomy lets us gets fundamental answers on the properties of the universe, of fundamental physics itself, and the origin of the elements,” Burns said.

Bright galaxies and other light sources in various sizes and shapes are scattered across a black swath of space: small points, hazy elliptical-like smudges with halos, and spiral-shaped blobs. The objects vary in color: white, blue-white, yellow-white, and orange-red. Toward the center right is a blue-white spiral galaxy seen face-on that is larger than the other light sources in the image. The galaxy is labeled “former home galaxy.” Toward the upper left is a small red point, which has a white circle around it and is labeled “GRB 230307A kilonova.”
This image from NASA’s James Webb Space Telescope NIRCam (Near-Infrared Camera) instrument highlights Gamma-Ray Burst (GRB) 230307A and its associated kilonova, as well as its former home galaxy, among their local environment of other galaxies and foreground stars. The GRB likely was powered by the merger of two neutron stars. The neutron stars were kicked out of their home galaxy and traveled the distance of about 120,000 light-years, approximately the diameter of the Milky Way galaxy, before finally merging several hundred million years later.
NASA, ESA, CSA, STScI, A. Levan (Radboud University and University of Warwick)

A Multitude of Messengers

Cosmic “messengers” associated with fleeting cosmic blips also help scientists reconstruct their origins. The initial 2015 discovery of gravitational waves by LIGO, the Laser Interferometer Gravitational-Wave Observatory, showed that the universe could be observed in a brand new way, and began a new era of possibility for using multiple messengers to study sudden blips in the universe.

In 2017, scientists demonstrated that potential by combining gravitational wave observations with data from many different ground and space-based observatories to study a kilonova, or neutron star merger, called GW170817. Among the insights from the extensive study of this kilonova, Burns and colleagues used it to make the first precise measurement of the speed of gravity, “the last major confirmation of a prediction from Einstein,” he said.  

Today, the network of the U.S. NSF (National Science Foundation)-supported LIGO, Europe’s VIRGO, and Japan’s KAGRA looks out for gravitational wave events.

When this animation opens, there are concentric rings of pale blue the expand away and off the screen. At the center is a bright ball of light with two narrow cones of orange, fiery-looking material extend in opposing directions, tilted just to the right. During the first few seconds, there are magenta flashes of light that seem to be pushed along with the ends of the orange cones. The central ball expands into a puffy, electric blue cloud. The sequence represents the events that happened after two neutron stars merged, exploding in a gamma-ray burst.
This animation captures phenomena observed over the course of nine days following the neutron star merger known as GW170817, detected on Aug. 17, 2017. They include gravitational waves (pale arcs), a near-light-speed jet that produced gamma rays (magenta), expanding debris from a kilonova that produced ultraviolet (violet), optical and infrared (blue-white to red) emission, and, once the jet directed toward us expanded into our view from Earth, X-rays (blue).
NASA’s Goddard Space Flight Center/Conceptual Image Lab

Light is the only kind of “messenger” from the universe that has been detected for both the BOAT and the gamma ray burst that seems to have produced tellurium. An experiment near the South Pole called IceCube, supported by the NSF, looked for high-energy neutrinos coming from the same area of the sky as each event, but did not find any. However, the lack of neutrinos observed helps scientists constrain the possibilities for how these events unfolded.

“This multi-messenger approach is important, even when you don’t have a detection,” said Michela Negro, astrophysicist and assistant professor at Louisiana State University. “It really helps rule out some scenarios, on top of telling us something new when we have detections.”

A Bright Future for TDAMM

For Lesage, who is writing his dissertation about the BOAT, time-domain and multimessenger astronomy is an exciting area of study. The BOAT itself is still keeping him and other astronomers busy as they look at all of the processes revealed by the exceptionally bright light from this extreme event. But more transient events are sure to come, and will keep scientists on their toes as they chase after them with a wide variety of telescopes and instruments.

“That’s just transient events — look now or you’re going to miss it,” Lesage said. “Look as quickly as you possibly can.”

This animation shows what happened in the nine days after a neutron star merger detected in 2017. First, a pair of glowing blue neutron stars spiral quickly toward each other, merging with a bright flash. The merger creates gravitational waves (shown as pale arcs rippling outward), a near-light-speed jet that produced gamma rays (shown as brown cones and a rapidly traveling magenta glow erupting from the center of the collision), and a donut-shaped ring of expanding blue debris around the center of the explosion. A variety of colors represent the wavelengths of light produced by the kilonova, creating violet to blue-white to red bursts above and below the collision.
Doomed neutron stars whirl toward their demise in this illustration. Gravitational waves bleed away orbital energy, causing the stars to move closer together and merge. As they collide, some of the debris blasts away in particle jets moving at nearly the speed of light, producing a brief burst of gamma rays.
NASA’s Goddard Space Flight Center/Conceptual Image Lab

Further Reading: Telescopes on the Case

In the next few years NASA will be launching new “watcher” satellites to help look out for sudden transient events like these. They include several CubeSats, which are a class of miniaturized spacecraft built in standardized units of cubes around 4 inches (10 cm) on a side:

  • BurstCube, launching in March 2024, to monitor gamma-ray signals
  • BlackCat, launching in 2025, to detect X-ray light
  • Starburst, launching in 2027, to monitor gamma-ray signals

International partnerships also involve this kind of science:

  • ULTRASAT (Ultraviolet Transient Astronomy Satellite), a small satellite from the Israeli Space Agency and the the Weizmann Institute of Science, with a wide field of view specializing in ultraviolet light, has NASA contributions. Expected to launch in 2026.
  • ESA’s LISA (Laser Interferometer Space Antenna) mission, which would be the first time that gravitational waves could be detected from space, has NASA contributions. Expected to launch in the 2030s.

Additionally, NASA telescopes with other primary goals can help look out for these unusual events:

  • Psyche, on its way to the metal-rich asteroid Psyche, has a gamma-ray spectrometer that astronomers can use to detect gamma-ray bursts as the spacecraft cruises toward its destination over the next several years.
  • WISE, which mapped the sky at infrared wavelengths, found many new distant objects and cosmic phenomena.  The NEOWISE mission, which reuses the WISE telescope, surveys near-Earth space for potentially hazardous asteroids.
  • NASA’s Nancy Grace Roman Space Telescope, an infrared observatory that will illuminate longstanding mysteries of dark energy and discover thousands of exoplanets, is designed to have a wide view of the sky and will undoubtedly pick up on transient infrared signals. The observatory will do several surveys to look for these phenomena, and the mission will support many teams to study relevant topics ranging from variable stars, the birth of black holes and active galaxies. Roman is scheduled to launch by May 2027, and will also provide alerts about the changes in the sky it discovers. 
  • The NEO Surveyor mission will use infrared detectors to broaden the search for asteroids and comets that may pose a hazard to the Earth.  The images to be taken by NEO Surveyor also are expected to capture many more distant background objects.
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      Roman’s largest survey, the High-Latitude Wide-Area Survey, combines the powers of imaging and spectroscopy to unveil more than a billion galaxies strewn across a wide swath of cosmic time. Roman can look far from the dusty plane of our Milky Way galaxy (that’s what the “high-latitude” part of the survey name means), looking up and out of the galaxy rather than through it to get the clearest view of the distant cosmos.
      The distribution and shapes of galaxies in Roman’s enormous, deep images can help us understand the nature of dark energy — a pressure that seems to be speeding up the universe’s expansion — and how invisible dark matter, which Roman will detect by its gravitational effects, influences the evolution of structure in our universe.
      For the last two years, researchers have been discussing ways to expand the range of scientific topics that can be studied using the same dataset. That includes studying galaxy evolution, star formation, cosmic voids, the matter between galaxies, and much more.
      This infographic describes the High-Latitude Time-Domain Survey that will be conducted by NASA’s Nancy Grace Roman Space Telescope. The survey’s main component covers over 18 square degrees — a region of sky as large as 90 full moons — and sees supernovae that occurred up to about 8 billion years ago. Smaller areas within the survey can pierce even farther, potentially back to when the universe was around a billion years old. The survey is split between the northern and southern hemispheres, located in regions of the sky that will be continuously visible to Roman. The bulk of the survey consists of 30-hour observations every five days for two years in the middle of Roman’s five-year primary mission.Credit: NASA’s Goddard Space Flight Center High-Latitude Time-Domain Survey
      Roman’s High-Latitude Time-Domain Survey can probe our dynamic universe by observing the same region of the cosmos repeatedly. Stitching these observations together to create movies can allow scientists to study how celestial objects and phenomena change over time periods of days to years.
      This survey can probe dark energy by finding and studying many thousands of a special type of exploding star called type Ia supernovae. These stellar cataclysms allow scientists to measure cosmic distances and trace the universe’s expansion.
      “Staring at a large volume of the sky for so long will also reveal black holes being born as neutron stars merge, and tidal disruption events –– flares released by stars falling into black holes,” said Saurabh Jha, a professor at Rutgers University in New Brunswick, New Jersey, and ROTAC co-chair. “It will also allow astronomers to explore variable objects, like active galaxies and binary systems. And it enables more open-ended cosmic exploration than most other space telescopes can do, offering a chance to answer questions we haven’t yet thought to ask.”
      This infographic describes the Galactic Bulge Time-Domain Survey that will be conducted by NASA’s Nancy Grace Roman Space Telescope. The smallest of Roman’s core surveys, this observation program consists of repeat visits to six fields covering 1.7 square degrees total. One field pierces the very center of the galaxy, and the others are nearby — all in a region of the sky that will be visible to Roman for two 72-day stretches each spring and fall. The survey mainly consists of six seasons (three early on, and three toward the end of Roman’s primary mission), during which Roman views each field every 12 minutes. Roman also views the six fields with less intensity at other times throughout the mission, allowing astronomers to detect microlensing events that can last for years, signaling the presence of isolated, stellar-mass black holes.Credit: NASA’s Goddard Space Flight Center Galactic Bulge Time-Domain Survey
      Unlike the high-latitude surveys, Roman’s Galactic Bulge Time-Domain Survey will look inward to provide one of the deepest views ever of the heart of our Milky Way galaxy. Roman’s crisp resolution and infrared view can allow astronomers to watch hundreds of millions of stars in search of microlensing signals — gravitational boosts of a background star’s light that occur when an intervening object passes nearly in front of it. While astronomers have mainly discovered star-hugging worlds, Roman’s microlensing observations can find planets in the habitable zone of their star and farther out, including analogs of every planet in our solar system except Mercury.
      The same set of observations can reveal “rogue” planets that drift through the galaxy unbound to any star, brown dwarfs (“failed stars” too lightweight to power themselves by fusion the way stars do), and stellar corpses like neutron stars and white dwarfs. And scientists could discover 100,000 new worlds by seeing stars periodically get dimmer as an orbiting planet passes in front of them, events called transits. Scientists can also study the stars themselves, detecting “starquakes” on a million giant stars, the result of sound waves reverberating through their interiors that can reveal information about their structures, ages, and other properties.
      Data from all of Roman’s surveys will be made public as soon as it is processed, with no periods of exclusive access.
      “Roman’s unprecedented data will offer practically limitless opportunities for astronomers to explore all kinds of cosmic topics,” McEnery said. “We stand to learn a tremendous amount of new information about the universe very rapidly after the mission launches.”
      Download high-resolution video and images from NASA’s Scientific Visualization Studio
      By Ashley Balzer
      NASA’s Goddard Space Flight Center, Greenbelt, Md.
      Media contact:
      Claire Andreoli
      NASA’s Goddard Space Flight Center, Greenbelt, Md.
      301-286-1940
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      Last Updated Apr 24, 2025 EditorAshley BalzerContactAshley Balzerashley.m.balzer@nasa.govLocationNASA Goddard Space Flight Center Related Terms
      Nancy Grace Roman Space Telescope Black Holes Dark Energy Dark Matter Earth-like Exoplanets Exoplanets Galaxies Gas Giant Exoplanets Neptune-Like Exoplanets Neutron Stars Stars Stellar-mass Black Holes Super-Earth Exoplanets Supernovae Terrestrial Exoplanets The Milky Way The Solar System The Universe Explore More
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