LIGO/Virgo/KAGRA Public Alerts

  • More details about public alerts are provided in the LIGO/Virgo/KAGRA Alerts User Guide.
  • Retractions are marked in red. Retraction means that the candidate was manually vetted and is no longer considered a candidate of interest.
  • Less-significant events are marked in grey, and are not manually vetted. Consult the LVK Alerts User Guide for more information on significance in O4.
  • Less-significant events are not shown by default. Press "Show All Public Events" to show significant and less-significant events.

O4 Significant Detection Candidates: 227 (253 Total - 26 Retracted)

O4 Low Significance Detection Candidates: 4492 (Total)


Show All Public Events

Event ID Possible Source (Probability) Significant UTC GCN Location FAR Comments GPS
S250830m BBH (98%), Terrestrial (2%) Yes 1440559647.03Aug. 30, 2025
03:27:09 UTC
GCN Circular Query
Notices | VOE
0.000000011898580000001 per 2.6632 years 1440559647.03
S250827fo BBH (>99%) Yes 1440370198.31Aug. 27, 2025
22:49:40 UTC
GCN Circular Query
Notices | VOE
0.000000000022551820001 per 1405.1 years 1440370198.31
S250827l BBH (>99%) Yes 1440293295.54Aug. 27, 2025
01:27:57 UTC
GCN Circular Query
Notices | VOE
0.000000000316754584221 per 100.04 years 1440293295.54
S250818t BBH (>99%) Yes 1439518156.39Aug. 18, 2025
02:08:58 UTC
GCN Circular Query
Notices | VOE
0.000000000017160280001 per 1846.6 years 1439518156.39
S250818k Terrestrial (71%), BNS (29%) Yes 1439515224.03Aug. 18, 2025
01:20:06 UTC
GCN Circular Query
Notices | VOE
0.000000068102235608242.1491 per year 1439515224.03
S250814bg Terrestrial (99%) Yes 1439192123.59Aug. 14, 2025
07:35:05 UTC
GCN Circular Query
Notices | VOE
0.000119702414178215603777.5 per year 1439192123.59
S250813k BBH (>99%) Yes 1439086338.44Aug. 13, 2025
02:12:00 UTC
GCN Circular Query
Notices | VOE
0.000000000126053903431 per 251.39 years 1439086338.44
S250810ck BBH (>99%) Yes 1438871055.34Aug. 10, 2025
14:23:57 UTC
GCN Circular Query
Notices | VOE
0.000000000000000000051 per 5.891e+11 years 1438871055.34
S250802dn BBH (93%), Terrestrial (7%) Yes 1438201530.02Aug. 2, 2025
20:25:12 UTC
GCN Circular Query
Notices | VOE
0.000000054941010000001.7338 per year 1438201530.02
S250727dc BBH (>99%) Yes 1437681726.46July 27, 2025
20:01:48 UTC
GCN Circular Query
Notices | VOE
0.000000000000000001121 per 2.8303e+10 years 1437681726.46
S250727cl BBH (>99%) Yes 1437674627.65July 27, 2025
18:03:29 UTC
GCN Circular Query
Notices | VOE
0.000000000000000000041 per 7.9146e+11 years 1437674627.65
S250726ak BBH (>99%) Yes 1437553713.37July 26, 2025
08:28:15 UTC
GCN Circular Query
Notices | VOE
0.000000000004675774001 per 6777.1 years 1437553713.37
S250725l BBH (99%), Terrestrial (1%) Yes 1437452468.94July 25, 2025
04:20:50 UTC
GCN Circular Query
Notices | VOE
0.000000029774930917091 per 1.0643 years 1437452468.94
S250725j BBH (>99%) Yes 1437451802.25July 25, 2025
04:09:44 UTC
GCN Circular Query
Notices | VOE
0.000000000042556559491 per 744.61 years 1437451802.25
S250720j Yes 1437012926.46July 20, 2025
02:15:08 UTC
GCN Circular Query
Notices | VOE
0.00003014051000000000951.16 per year RETRACTED 1437012926.46