# Are the brightest one-off bursts the tail of one distribution or a separate class? · Fast radio bursts and the origin of the one-off bursts > Three answers have been proposed. None is ahead on the evidence yet. Three are still possible. Source: https://mysteriesdept.com/mysteries/fast-radio-bursts/questions/QST0CVCMBWG1P3D/are-the-brightest-one-off-bursts-the-tail-of-one Publisher: Mysteries Department Licence: CC BY 4.0 (credit Mysteries Department and link the page) Updated: 2026-10-26T11:57:23+00:00 --- **0** # Are the brightest one-off bursts the tail of one distribution or a separate class? Asked 26 Oct 2026 by [**apollo** ](https://mysteriesdept.com/u/apollo)·Part of [Are repeating and one-off sources one population or several?](https://mysteriesdept.com/mysteries/fast-radio-bursts/questions/QST0CVCMBMP0WB0/are-repeating-and-one-off-sources-one-population-or-several)·3 answers·0·0 following **Three answers, none ahead** None is ahead yet. See what would settle it. ## Where it stands Three answers have been proposed. None is ahead on the evidence yet. Three are still possible. ## Why it matters FRB 20250316A, the brightest nearby one-off, is a strong outlier in Catalog 2⁠[[1]](https://mysteriesdept.com/sources/SRC0CVCM5S65R1R/extreme-value-distribution-analysis-of-the-second-chime-frb); if such bursts are a separate class, they may need a different engine. ## Answers 3 [**None of these.** ](https://mysteriesdept.com/mysteries/fast-radio-bursts/answers/ANS0CVCMMNR4G79/none-of-these) Not tested enough to call either way Evidence: none yet Still possible [**The brightest bursts are the heavy tail of a single luminosity distribution.** ](https://mysteriesdept.com/mysteries/fast-radio-bursts/answers/ANS0CVCMKPG3V4Q/the-brightest-bursts-are-the-heavy-tail-of-a-single) Not tested enough to call either way Evidence: 1 for Still possible [**The brightest one-offs are a distinct physical class.** ](https://mysteriesdept.com/mysteries/fast-radio-bursts/answers/ANS0CVCMM641XHQ/the-brightest-one-offs-are-a-distinct-physical-class) Not tested enough to call either way Evidence: 1 for Still possible ## History 1. 2026[Zhang & Wei puts forward: the brightest bursts are the heavy tail of a single luminosity distribution.](https://mysteriesdept.com/sources/SRC0CVCM5S65R1R/extreme-value-distribution-analysis-of-the-second-chime-frb) 1. 2026[Zhang & Wei puts forward: the brightest one-offs are a distinct physical class.](https://mysteriesdept.com/sources/SRC0CVCM5S65R1R/extreme-value-distribution-analysis-of-the-second-chime-frb) 1. 2026[Zhang & Wei: the full peak-flux sample fits an unbounded Fréchet-type distribution.](https://mysteriesdept.com/sources/SRC0CVCM5S65R1R/extreme-value-distribution-analysis-of-the-second-chime-frb)For: The brightest bursts are the heavy tail of a single luminosity distribution. 1. 2026[Zhang & Wei: with three other outliers removed, the fluence distribution is bounded and FRB 20250316A far exceeds the…](https://mysteriesdept.com/sources/SRC0CVCM5S65R1R/extreme-value-distribution-analysis-of-the-second-chime-frb)For: The brightest one-offs are a distinct physical class. 1. 26 Oct 2026Asked on this site ## Discussion 0 [Add to the discussion](https://mysteriesdept.com/signin?next=/mysteries/fast-radio-bursts/questions/QST0CVCMBWG1P3D/are-the-brightest-one-off-bursts-the-tail-of-one%23discussion) Help with this question [ **Propose an answer** Something the evidence could support or rule out ] [ **Propose an answer** Something the evidence could support or rule out ](https://mysteriesdept.com/signin?next=/mysteries/fast-radio-bursts/questions/QST0CVCMBWG1P3D/are-the-brightest-one-off-bursts-the-tail-of-one%23add-answer) [ **Add evidence** A result for or against an answer ] [ **Add evidence** A result for or against an answer ](https://mysteriesdept.com/signin?next=/mysteries/fast-radio-bursts/questions/QST0CVCMBWG1P3D/are-the-brightest-one-off-bursts-the-tail-of-one%23add-evidence) [ **Ask a sub-question** A smaller question that would help settle this one ] [ **Ask a sub-question** A smaller question that would help settle this one ](https://mysteriesdept.com/signin?next=/mysteries/fast-radio-bursts/questions/QST0CVCMBWG1P3D/are-the-brightest-one-off-bursts-the-tail-of-one%23add-question) [ **Add a source** A paper, archive record or image ] [ **Add a source** A paper, archive record or image ](https://mysteriesdept.com/signin?next=/mysteries/fast-radio-bursts/questions/QST0CVCMBWG1P3D/are-the-brightest-one-off-bursts-the-tail-of-one%23add-source) Where it fits Fast radio bursts and the origin of the one-off bursts [**Are repeating and one-off sources one population or several?** ](https://mysteriesdept.com/mysteries/fast-radio-bursts/questions/QST0CVCMBMP0WB0/are-repeating-and-one-off-sources-one-population-or-several)Key question · 3 answers, inconclusive **Are the brightest one-off bursts the tail of one distribution or a separate class?** You're here · 3 answers, inconclusive [ Ask a question under this one ]