2026ApJ...998..339S

Query : 2026ApJ...998..339S

2026ApJ...998..339S - Astrophys. J., 998, 339 (2026/February-3)

A Practical Framework for Estimating the Repetition Likelihood of Fast Radio Bursts from Spectral Morphology.

SUN W.-P., ZHANG Y.-K., ZHANG J.-G., LIU X., LI Y., ZHANG F.-W., HOU W.-T., ZHANG J.-F. and ZHANG X.

Abstract (from CDS):

The repeating behavior of fast radio bursts (FRBs) is regarded as a key clue to understanding their physical origin, yet reliably distinguishing repeaters from apparent nonrepeaters with current observations remains challenging. Here we propose a physically interpretable and practically quantifiable classification framework based on spectral morphology. Using dimensionality reduction, clustering, and feature-importance analysis, we identify the spectral running r and spectral index γ as the most critical parameters for distinguishing repeaters from apparent nonrepeaters in the CHIME/FRB sample. In the γ-r space, repeaters preferentially occupy regions with steeper, narrower-band spectra, whereas nonrepeaters cluster in flatter, broader-band regions, resulting in a clear density separation. We further construct a probability map in the γ-r space based on Gaussian mixture model posterior analysis, revealing a clear gradient of repetition likelihood from ∼67% in the high-repetition region to ∼7% in the low-repetition region. This model also identifies several apparent nonrepeaters with high inferred repetition probability, highlighting them as priority targets for future monitoring. This framework provides a simple and generalizable tool for assessing repeatability in the CHIME/FRB sample and highlights the diagnostic power of spectral morphology in unveiling FRB origins.

Abstract Copyright: © 2026. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radio transient sources - Radio bursts - Classification systems

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 135

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Number of rows : 135
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 FRB 20181218A rB 00 20 14.4000 +71 21 00.000           ~ 8 0
2 FRB 20190629A rB 00 25 21.6000 +12 40 12.000           ~ 11 0
3 FRB 20190114A rB 00 35 48.0000 +19 10 12.000           ~ 8 0
4 FRB 20190102A rB 00 37 02.4000 +26 43 12.000           ~ 15 0
5 FRB 20190411C rB 00 37 19.2000 +20 30 00.000           ~ 14 0
6 FRB 20190527A rB 00 49 48.0000 +07 59 24.000           ~ 14 0
7 FRB 20190226C rB 01 09 50.4000 +26 45 36.000           ~ 10 0
8 FRB 20190601B rB 01 11 31.2000 +23 49 12.000           ~ 11 0
9 FRB 20181101A rB 01 25 02.4000 +53 52 48.000           ~ 9 0
10 FRB 20190130A rB 01 42 33.6000 +13 09 36.000           ~ 8 0
11 FRB 20190605D rB 01 46 52.8000 +28 37 12.000           ~ 9 0
12 FRB 20190308B rB 02 34 21.6000 +83 37 12.000           ~ 10 0
13 FRB 20190129A rB 03 00 14.4000 +21 25 12.000           ~ 12 0
14 FRB 20190417C rB 03 02 43.2000 +71 15 36.000           ~ 12 0
15 FRB 20190125A rB 03 02 55.2000 +27 48 36.000           ~ 9 0
16 FRB 20181203B rB 03 09 14.4000 +24 01 12.000           ~ 9 0
17 FRB 20190422A rB 03 14 14.4000 +35 09 00.000           ~ 13 0
18 FRB 20190206B rB 03 19 02.4000 +79 30 00.000           ~ 10 0
19 FRB 20181222E rB 03 22 33.6000 +86 58 12.000           ~ 13 0
20 FRB 20181117C rB 03 32 50.4000 +25 43 48.000           ~ 8 0
21 FRB 20190617B rB 03 45 43.2000 +01 09 36.000           ~ 14 0
22 FRB 20190224A rB 04 02 07.2000 +83 23 24.000           ~ 7 0
23 FRB 20190223A rB 04 18 52.8000 +87 39 00.000           ~ 11 0
24 FRB 20190110A rB 04 19 48.0000 +47 26 24.000           ~ 11 0
25 FRB 20190329A rB 04 22 09.6000 +73 37 48.000           ~ 11 0
26 FRB 20190211A rB 04 28 14.4000 +68 38 24.000           ~ 8 0
27 FRB 20190515D rB 04 28 31.2000 -05 00 36.000           ~ 10 0
28 FRB 20190529A rB 04 32 14.4000 +40 19 12.000           ~ 9 0
29 FRB 20190530A rB 04 34 57.6000 +60 35 24.000           ~ 8 0
30 FRB 20190128C rB 04 39 12.0000 +78 56 24.000           ~ 10 0
31 FRB 20181214A rB 04 40 00.0000 +43 04 12.000           ~ 12 0
32 FRB 20190415C rB 04 59 14.4000 +34 48 00.000           ~ 6 0
33 FRB 20201124A rB 05 07 57.600 +26 11 24.00           ~ 307 0
34 FRB 20190430A rB 05 10 48.0000 +87 00 36.000           ~ 11 0
35 FRB 20180920A rB 05 15 33.6000 +28 17 24.000           ~ 8 0
36 FRB 20181117B rB 05 24 21.6000 +79 59 24.000           ~ 9 0
37 FRB 20190403G rB 05 26 57.6000 +25 46 48.000           ~ 8 0
38 FRB 20181119D rB 05 31 58.6980 +33 08 52.588           ~ 933 0
39 FRB 20190517C rB 05 50 00.0000 +26 37 12.000           ~ 11 0
40 FRB 20190601C rB 05 54 04.8000 +28 28 12.000           ~ 15 0
41 FRB 20180725A rB 06 13 40.8000 +67 04 12.000           ~ 15 0
42 FRB 20190518G rB 06 19 09.6000 +75 31 12.000           ~ 8 0
43 FRB 20181226F rB 06 23 +83.8           ~ 4 0
44 FRB 20190701C rB 06 25 26.4000 +81 37 48.000           ~ 13 0
45 FRB 20181209A rB 06 32 38.4000 +68 41 24.000           ~ 9 0
46 FRB 20190419A rB 06 59 55.2000 +64 52 48.000           ~ 9 0
47 FRB 20180916C rB 07 08 36.0000 +45 04 48.000           ~ 7 0
48 FRB 20190701D rB 07 28 24.0000 +66 42 00.000           ~ 13 0
49 FRB 20190625D rB 07 40 04.8000 +04 52 12.000           ~ 8 0
50 FRB 20190426A rB 07 40 09.6000 +59 07 12.000           ~ 7 0
51 FRB 20181014C rB 07 51 28.8000 +41 35 24.000           ~ 7 0
52 FRB 20200127B rB 07 55 +86.6           ~ 5 0
53 FRB 20190304A rB 08 18 02.4000 +74 36 36.000           ~ 12 0
54 FRB 20190409B rB 08 26 36.0000 +63 28 12.000           ~ 12 0
55 FRB 20181231B rB 08 35 04.8000 +55 59 24.000           ~ 14 0
56 FRB 20190221A rB 08 50 24.0000 +09 54 00.000           ~ 10 0
57 FRB 20190203A rB 08 54 43.2000 +70 49 12.000           ~ 13 0
58 FRB 20181030E rB 09 02 40.8000 +08 53 24.000           ~ 10 0
59 FRB 20190208C rB 09 26 12.0000 +83 33 36.000           ~ 10 0
60 FRB 20181115A rB 09 31 55.2000 +56 24 00.000           ~ 8 0
61 FRB 20180925B rB 09 41 48.0000 +20 59 24.000           ~ 8 0
62 FRB 20181125A rB 09 51 45.6000 +33 55 48.000           ~ 14 0
63 FRB 20190502C rB 10 22 24.0000 +82 58 12.000           ~ 11 0
64 FRB 20190204A rB 10 45 19.2000 +61 31 48.000           ~ 10 0
65 FRB 20190519F rB 11 02 31.2000 +77 13 48.000           ~ 8 0
66 FRB 20190605C rB 11 13 16.8000 -05 11 24.000           ~ 12 0
67 FRB 20180923D rB 11 16 19.2000 +48 45 00.000           ~ 8 0
68 FRB 20190428A rB 11 22 55.2000 +23 19 48.000           ~ 9 0
69 FRB 20190130B rB 11 28 26.4000 +16 03 00.000           ~ 12 0
70 FRB 20190416B rB 11 28 45.6000 +35 57 00.000           ~ 7 0
71 FRB 20181223B rB 11 39 33.6000 +21 35 24.000           ~ 10 0
72 FRB 20190423A rB 11 58 43.2000 +55 15 00.000           ~ 16 0
73 FRB 20190614A rB 11 59 09.6000 +88 19 48.000           ~ 9 0
74 FRB 20190228A rB 12 13 55.2000 +22 54 00.000           ~ 11 0
75 FRB 20181213B rB 12 14 04.8000 +53 42 00.000           ~ 9 0
76 FRB 20181222D rB 12 32 48.0000 +56 09 36.000           ~ 8 0
77 FRB 20190308C rB 12 33 26.4000 +44 23 24.000           ~ 13 0
78 FRB 20180920B rB 12 44 21.6000 +63 31 12.000           ~ 11 0
79 FRB 20190131E rB 13 02 36.0000 +80 55 12.000           ~ 11 0
80 FRB 20190627A rB 13 03 33.6000 +00 45 00.000           ~ 9 0
81 NAME FRB 180729.J1316+55 rB 13 17 36.0000 +55 34 48.000           ~ 15 0
82 FRB 20181012B rB 13 45 19.2000 +64 09 00.000           ~ 8 0
83 FRB 20190621C rB 13 46 16.8000 +05 13 48.000           ~ 10 0
84 FRB 20190425B rB 14 00 28.8000 +88 36 00.000           ~ 12 0
85 FRB 20190111A rB 14 28 00.0000 +26 46 48.000           ~ 10 0
86 FRB 20190403E rB 14 40 52.8000 +86 32 24.000           ~ 11 0
87 FRB 20181022E rB 14 44 43.2000 +27 07 48.000           ~ 10 0
88 FRB 20190612B rB 14 48 50.4000 +04 18 36.000           ~ 10 0
89 FRB 20190304C rB 14 52 02.4000 +26 43 12.000           ~ 9 0
90 FRB 20181221A rB 15 22 19.2000 +25 51 36.000           ~ 17 0
91 FRB 20181017B rB 15 51 02.4000 +78 30 00.000           ~ 13 0
92 FRB 20181229B rB 15 53 28.8000 +19 46 48.000           ~ 12 0
93 FRB 20190222C rB 15 56 43.2000 +40 01 48.000           ~ 8 0
94 FRB 20181127A rB 16 15 12.0000 +25 25 48.000           ~ 9 0
95 FRB 20190206A rB 16 19 24.0000 +09 21 36.000           ~ 15 0
96 FRB 20181228B rB 16 41 43.2000 +63 51 00.000           ~ 14 0
97 FRB 20181214F rB 16 50 28.8000 +32 26 24.000           ~ 9 0
98 FRB 20190118A rB 16 53 14.4000 +11 33 00.000           ~ 12 0
99 FRB 20190109B rB 16 53 52.8000 +01 15 00.000           ~ 10 0
100 FRB 20190112A rB 17 11 55.2000 +61 12 00.000           ~ 12 0
101 FRB 20181126A rB 17 28 12.0000 +81 10 12.000           ~ 8 0
102 FRB 20190408A rB 17 28 48.0000 +71 36 00.000           ~ 7 0
103 FRB 20190410A rB 17 33 52.8000 -02 22 12.000           ~ 11 0
104 FRB 20190410B rB 17 43 02.4000 +15 10 12.000           ~ 10 0
105 FRB 20190218B rB 17 54 48.0000 +17 55 48.000           ~ 13 0
106 FRB 20181128C rB 17 55 04.8000 +49 42 36.000           ~ 11 0
107 FRB 20190621D rB 18 02 31.2000 +78 53 24.000           ~ 11 0
108 FRB 20190520A rB 18 14 04.8000 +26 19 12.000           ~ 11 0
109 FRB 20190301D rB 18 34 52.8000 +74 40 48.000           ~ 8 0
110 FRB 20190309A rB 18 35 50.4000 +52 24 36.000           ~ 8 0
111 FRB 20180904A rB 19 06 19.2000 +81 13 12.000           ~ 7 0
112 NAME Sgr 1935+2154 * 19 34 55.68 +21 53 48.2           ~ 820 1
113 FRB 20190519J rB 19 44 50.4000 +86 55 48.000           ~ 8 0
114 FRB 20190423B rB 19 54 19.2000 +26 11 24.000           ~ 13 0
115 FRB 20181123A rB 20 03 02.4000 +55 52 12.000           ~ 8 0
116 FRB 20190624B rB 20 18 36.0000 +73 36 36.000           ~ 12 0
117 FRB 20181221B rB 20 25 14.4000 +80 58 48.000           ~ 10 0
118 FRB 20181129B rB 20 30 14.4000 +81 19 12.000           ~ 8 0
119 FRB 20190101B rB 20 31 04.8000 +29 53 24.000           ~ 8 0
120 FRB 20181030C rB 20 39 19.2000 +03 59 24.000           ~ 7 0
121 FRB 20180928A rB 20 51 48.0000 +30 51 00.000           ~ 10 0
122 FRB 20190210E rB 20 54 36.0000 +86 40 12.000           ~ 7 0
123 FRB 20190618A rB 21 25 00.0000 +25 26 24.000           ~ 12 0
124 NAME FRB 180801.J2130+72 rB 21 30 07.2000 +72 43 12.000           ~ 17 0
125 FRB 20180923A rB 21 50 26.4000 +71 55 12.000           ~ 7 0
126 FRB 20190429B rB 21 59 43.2000 +03 57 36.000           ~ 11 0
127 FRB 20190531C rB 22 04 33.6000 +43 00 00.000           ~ 9 0
128 FRB 20190210D rB 22 17 58.0 +52 53 20           ~ 11 0
129 FRB 20190623B rB 22 20 52.8000 +46 07 12.000           ~ 7 0
130 FRB 20190106B rB 22 22 31.2000 +46 07 48.000           ~ 12 0
131 FRB 20190213D rB 22 25 48.0000 +52 42 36.000           ~ 11 0
132 FRB 20190205A rB 22 48 52.8000 +83 22 12.000           ~ 7 0
133 FRB 20190609A rB 23 01 12.0000 +87 56 24.000           ~ 16 0
134 FRB 20181230A rB 23 06 45.6000 +83 22 12.000           ~ 9 0
135 FRB 20181130A rB 23 40 45.6000 +46 29 24.000           ~ 9 0

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