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FRB 20240304B (NIRCam Image)

A field full of small galaxies of all shapes against the blackness of space. A few bright white stars show 8 prominent diffraction spikes. A small galaxy at lower right is highlighted with a white box. A shaded triangle extends upward to the corners of a larger box showing a zoom in of the region. Two fuzzy, light blue blobs are at center, with a larger and brighter one at top. Just above the top blob is a white crosshair showing the location where a fast radio burst was detected.

NASA’s James Webb Space Telescope’s NIRCam (Near-Infrared Camera) was able to detect the host galaxy of the fast radio burst called FRB 20240304B, whose location is shown by the white cross. They found it is a small dwarf galaxy actively forming stars.

About the Object

  • R.A. Position
    R.A. PositionRight ascension – analogous to longitude – is one component of an object's position.
    12:11:59.294
  • Dec. Position
    Dec. PositionDeclination – analogous to latitude – is one component of an object's position.
    +11:48:46.830
  • Constellation
    ConstellationOne of 88 recognized regions of the celestial sphere in which the object appears.
    Virgo
  • Distance
    DistanceThe physical distance from Earth to the astronomical object. Distances within our solar system are usually measured in Astronomical Units (AU). Distances between stars are usually measured in light-years. Interstellar distances can also be measured in parsecs.
    10.63 billion light-years (z=2.148)

About the Data

  • Data Description
    Data DescriptionProposal: A description of the observations, their scientific justification, and the links to the data available in the science archive.
    Science Team: The astronomers who planned the observations and analyzed the data. "PI" refers to the Principal Investigator.

    This image was created with Webb data from proposal: 6779 (M. Caleb).

  • Instrument
    InstrumentThe science instrument used to produce the data.
    NIRCam
  • Exposure Dates
    Exposure DatesThe date(s) that the telescope made its observations and the total exposure time.
    December 26, 2024
  • Filters
    FiltersThe camera filters that were used in the science observations.
    F200W, F322W
  • Object Name
    Object NameA name or catalog number that astronomers use to identify an astronomical object.
    FRB 20240304B
  • Object Description
    Object DescriptionThe type of astronomical object.
    Fast Radio Burst, millisecond-duration radio pulse
  • Release Date
    October 8, 2026
  • Science Release
    Webb Measures Distance to Farthest Fast Radio Burst, Suggesting Origin
    Read the release
  • Credit
    Image: NASA, ESA, CSA, STScI, Themiya Nanayakkara (USYD); Image Processing: Joseph DePasquale (STScI)

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A field full of small galaxies of all shapes against the blackness of space. A few bright white stars show 8 prominent diffraction spikes. A small galaxy at lower right is highlighted with a white box. A shaded triangle extends upward to the corners of a larger box showing a zoom in of the region. Two fuzzy, light blue blobs are at center, with a larger and brighter one at top. Just above the top blob is a white crosshair showing the location where a fast radio burst was detected.
Color Info
Color InfoA brief description of the methods used to convert telescope data into the color image being presented.

This image is a composite of separate exposures acquired by the James Webb Space Telescope using the NIRCam instrument. Two filters were used to sample specific wavelength ranges. The color results from assigning different hues (colors) to each monochromatic (grayscale) image associated with an individual filter. In this case, the assigned colors are: Cyan: F200W, Orange: F322W

Compass and Scale
Compass and ScaleAn astronomical image with a scale that shows how large an object is on the sky, a compass that shows how the object is oriented on the sky, and the filters with which the image was made.

Related Images & Videos

A graphic titled “Fast Radio Burst Host Galaxy; Most Distant Fast Radio Burst; NIRSpec Integral Field Spectroscopy.” A graph plots brightness of light versus wavelength. The y axis is labeled brightness with an up arrow labeled brighter and a down arrow labeled dimmer. The x axis is labeled “Wavelength of Light, microns” and goes from 1.0 to 5.0 with tickmarks every 0.5 microns. A jagged white line slopes downward from left to right between 1.0 and 2.5 microns, and is mostly flat beyond that. A prominent peak at 1.6 microns is labeled Oxygen with a transparent blue vertical band. Another peak at 2.1 microns is labeled Hydrogen with a transparent red vertical band. At upper right, a box contains text reading “Redshift = 2.148”.

Farthest Fast Radio Burst Host Galaxy Spectrum

Astronomers using NASA’s James Webb Space Telescope were able to study the host galaxy of the most distant known fast radio burst (FRB). They confirmed it has a cosmological redshift of 2.148 and that the FRB occurred just 3 billion years after the big bang.

Image titled “James Webb Space Telescope, FRB 20240304B”. A field full of small galaxies of all shapes against the blackness of space. A few bright white stars show 8 prominent diffraction spikes. A small galaxy at lower right is highlighted with a white box. A shaded triangle extends upward to the corners of a larger box showing a zoom in of the region. Two fuzzy, light blue blobs are at center, with a larger and brighter one at top. Just above the top blob is a white crosshair showing the location where a fast radio burst was detected. At bottom right, a compass arrow shows north pointing to one o’clock and east pointing to 10 o’clock. A label at bottom says “JWST NIRCam filters” with F200W in blue and F322W in orange.

FRB 20240304B (NIRCam Compass Image)

This image of the host galaxy of fast radio burst FRB 20240304B, captured by the James Webb Space Telescope’s Near Infrared Camera (NIRCam), shows compass arrows, scale bar, and color key for reference.

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Details

Last Updated
Oct 08, 2026
Location
NASA Goddard Space Flight Center
Contact
Media

Laura Betz
NASA’s Goddard Space Flight Center
Greenbelt, Maryland
laura.e.betz@nasa.gov

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