CHIME/FRB Discovery and Localization of the Swift-observed FRB 20241228A

The Astrophysical Journal 2026 Open access

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Authors: Alice P. Curtin, Shion Andrew, Sunil Simha, Alice Cai, Kenzie Nimmo, Shami Chatterjee, Amanda M. Cook, Fengqiu Adam Dong, Yuxin Dong, Tarraneh Eftekhari, W. Fong, Emmanuel Fonseca
+17 more Jason W. T. Hessels, Ronniy C. Joseph, Victoria Kaspi, Calvin Leung, Robert Main, Kiyoshi W. Masui, Ryan Mckinven, Daniele Michilli, Mason Ng, Ayush Pandhi, Aaron B. Pearlman, Mawson W. Sammons, Ketan R Sand, Paul Scholz, Vishwangi Shah, Kaitlyn Shin, A. Tohuvavohu
DOI: 10.3847/1538-4357/ae2ea0
Cited by: 3
References: 87

Abstract

Abstract On 2024 December 28, the Canadian Hydrogen Intensity Mapping Experiment (CHIME) FRB project detected the thus-far nonrepeating FRB 20241228A with a real-time signal-to-noise ratio of >50. Approximately 112 s later, the X-ray Telescope on board the Neil Gehrels Swift Observatory was on-source, the fastest follow-up to date of a nonrepeating fast radio burst (FRB). Using CHIME/FRB and two of the three CHIME/FRB Outriggers, we obtained a very-long-baseline interferometry (VLBI) localization for FRB 20241228A with a 1 σ confidence ellipse of 11″ by 0 . ″ 2. This represents the first published localization using both the CHIME k’niʔatn k’l⌣stk’masqt and CHIME Green Bank Observatory Outriggers. We associate FRB 20241228A with a star-forming galaxy at a redshift of z = 0.1614 ± 0.0002. The persistent X-ray luminosity limit at this source’s location and distance is

Fields of Study & Subjects

Gamma-ray bursts and supernovae Pulsars and Gravitational Waves Research Astrophysical Phenomena and Observations

Publication details

Journal / source
The Astrophysical Journal
Publisher
American Astronomical Society
Volume
998
Issue
1
Pages
97–97
Publication date
4 February 2026
Language
EN