---
title: "A fast radio burst at redshift 2, three billion years after the Big Bang"
description: "Fast radio bursts (FRBs) are millisecond-duration radio transients from extragalactic sources. Their frequency and polarization properties are affected by plasma and magnetic fields along the line of sight to Earth. We report radio observations of FRB 20240304B and near-infrared follow-up to identify its host galaxy…"
datePublished: "2026-10-08"
lastmod: "2026-10-09T09:44:20+00:00"
authors:
  - "Manisha Caleb"
  - "Themiya Nanayakkara"
  - "Benjamin W. Stappers"
  - "Inés Pastor-Marazuela"
  - "Ilya S. Khrykin"
  - "Karl Glazebrook"
  - "Nicolas Tejos"
  - "J. Xavier Prochaska"
  - "Kaustubh Rajwade"
  - "Lluis Mas-Ribas"
  - "Laura N. Driessen"
  - "Wen-fai Fong"
  - "Alexa C. Gordon"
  - "Jordan L. Hoffmann"
  - "Clancy W. James"
  - "Fabian Jankowski"
  - "Lordrick Kahinga"
  - "Michael Kramer"
  - "Sunil Simha"
  - "Ewan D. Barr"
  - "Mechiel Christiaan Bezuidenhout"
  - "Xihan Deng"
  - "Zeren Lin"
  - "Lachlan Marnoch"
  - "Christopher D. Martin"
  - "Anya Nugent"
  - "Kavya Shaji"
  - "Jun Tian"
journal: "Science"
publisher: "American Association for the Advancement of Science (AAAS)"
doi: "10.1126/science.adz2675"
publicationType: "journal-article"
schemaType: "ScholarlyArticle"
language: "en-GB"
slug: "10.1126-science.adz2675"
---

# A fast radio burst at redshift 2, three billion years after the Big Bang

**Authors:** Manisha Caleb, Themiya Nanayakkara, Benjamin W. Stappers, Inés Pastor-Marazuela, Ilya S. Khrykin, Karl Glazebrook, Nicolas Tejos, J. Xavier Prochaska, Kaustubh Rajwade, Lluis Mas-Ribas, Laura N. Driessen, Wen-fai Fong, Alexa C. Gordon, Jordan L. Hoffmann, Clancy W. James, Fabian Jankowski, Lordrick Kahinga, Michael Kramer, Sunil Simha, Ewan D. Barr, Mechiel Christiaan Bezuidenhout, Xihan Deng, Zeren Lin, Lachlan Marnoch, Christopher D. Martin, Anya Nugent, Kavya Shaji, Jun Tian  
**Journal:** Science  
**Publisher:** American Association for the Advancement of Science (AAAS)  
**Published:** 2026-10-08  
**DOI:** [10.1126/science.adz2675](https://dx.doi.org/10.1126/science.adz2675)

## Abstract

Fast radio bursts (FRBs) are millisecond-duration radio transients from extragalactic sources. Their frequency and polarization properties are affected by plasma and magnetic fields along the line of sight to Earth. We report radio observations of FRB 20240304B and near-infrared follow-up to identify its host galaxy. The host is a low-mass, clumpy, star-forming galaxy at redshift 2.148 ± 0.0013, corresponding to 3 billion years after the Big Bang. This FRB occurred during the peak of cosmic star formation and probes ionized gas over approximately 80% of cosmic history. The highly scattered burst emission implies that there is a population of FRBs that are undetected by current surveys.

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