128 new mergers between black holes and neutron stars.
Today we're revealing the biggest ever update to our count of gravitational wave detections. New data from May 2023 to January 2024 has more than doubled the number we've seen.
🧵 1/3
@ligo.org #Virgo #KAGRA #GravitationalWaves 🔭 #GWTC-4 #O4a
Today we're revealing the biggest ever update to our count of gravitational wave detections. New data from May 2023 to January 2024 has more than doubled the number we've seen.
🧵 1/3
@ligo.org #Virgo #KAGRA #GravitationalWaves 🔭 #GWTC-4 #O4a
August 26, 2025 at 6:38 AM
Also, my partner in crime has his own thoughts on GWTC-4 and associated papers!
So, what can we say about the latest GWTC 4 catalogue?
In some ways, it's not too surprising, it's a 'firming up' of the clues we were getting from GWTC 3. But there's a couple of neat things: So, AGN channel perspective follows
1/n
In some ways, it's not too surprising, it's a 'firming up' of the clues we were getting from GWTC 3. But there's a couple of neat things: So, AGN channel perspective follows
1/n
August 26, 2025 at 9:53 PM
Also, my partner in crime has his own thoughts on GWTC-4 and associated papers!
So, what can we say about the latest GWTC 4 catalogue?
In some ways, it's not too surprising, it's a 'firming up' of the clues we were getting from GWTC 3. But there's a couple of neat things: So, AGN channel perspective follows
1/n
In some ways, it's not too surprising, it's a 'firming up' of the clues we were getting from GWTC 3. But there's a couple of neat things: So, AGN channel perspective follows
1/n
August 26, 2025 at 7:16 PM
So, what can we say about the latest GWTC 4 catalogue?
In some ways, it's not too surprising, it's a 'firming up' of the clues we were getting from GWTC 3. But there's a couple of neat things: So, AGN channel perspective follows
1/n
In some ways, it's not too surprising, it's a 'firming up' of the clues we were getting from GWTC 3. But there's a couple of neat things: So, AGN channel perspective follows
1/n
📢 The international network of gravitational wave detectors LIGO-Virgo-KAGRA (LVK) announces the publication of an updated catalogue of all gravitational events observed up to January 2024, called Gravitational-Wave Transient Catalogue-4.0 (GWTC-4).
March 6, 2026 at 11:11 AM
📢 The international network of gravitational wave detectors LIGO-Virgo-KAGRA (LVK) announces the publication of an updated catalogue of all gravitational events observed up to January 2024, called Gravitational-Wave Transient Catalogue-4.0 (GWTC-4).
wrote today about Noches de Campeones, this week's AAA TV, the week's AAA non-TV and some other notes from the last few days thecubsfan.com/cmll/gwtc
Noche de Campeones, Worlds Collide
CMLL CMLL (THU) 09/24/2026 Arena Coliseo [CMLL] 1) Minos I & Minos II b Acero & Aéreo 2) Blue Shark b Disturbio [lightning] 3) Espíritu Negro & Rey Cometa b Okumura & Raider 4) Arka…
thecubsfan.com
September 25, 2026 at 6:57 PM
wrote today about Noches de Campeones, this week's AAA TV, the week's AAA non-TV and some other notes from the last few days thecubsfan.com/cmll/gwtc
The O4a results (GWTC-4) of LIGO-Virgo-KAGRA are now out 🥳
We have 128 new candidates of which 86 have a false alarm rate of less this 1 per year
The new catalog results arxiv.org/abs/2508.18082
Update on black hole and neutron star population arxiv.org/abs/2508.18083
We have 128 new candidates of which 86 have a false alarm rate of less this 1 per year
The new catalog results arxiv.org/abs/2508.18082
Update on black hole and neutron star population arxiv.org/abs/2508.18083
GWTC-4.0: An Introduction to Version 4.0 of the Gravitational-Wave Transient Catalog
The Gravitational-Wave Transient Catalog (GWTC) is a collection of short-duration (transient) gravitational wave signals identified by the LIGO-Virgo-KAGRA Collaboration in gravitational-wave data pro...
arxiv.org
August 26, 2025 at 2:44 AM
The O4a results (GWTC-4) of LIGO-Virgo-KAGRA are now out 🥳
We have 128 new candidates of which 86 have a false alarm rate of less this 1 per year
The new catalog results arxiv.org/abs/2508.18082
Update on black hole and neutron star population arxiv.org/abs/2508.18083
We have 128 new candidates of which 86 have a false alarm rate of less this 1 per year
The new catalog results arxiv.org/abs/2508.18082
Update on black hole and neutron star population arxiv.org/abs/2508.18083
Evidence for a forbidden range of black-hole masses is detected in data from the fourth Gravitational-Wave Transient Catalog (GWTC-4) from LIGO–Virgo–KAGRA looking at binary black-hole systems, according to a paper in Nature. go.nature.com/4m1FKww 🔭 🧪
April 2, 2026 at 10:19 PM
Evidence for a forbidden range of black-hole masses is detected in data from the fourth Gravitational-Wave Transient Catalog (GWTC-4) from LIGO–Virgo–KAGRA looking at binary black-hole systems, according to a paper in Nature. go.nature.com/4m1FKww 🔭 🧪
I have seen this and am already wondering if I can present the GWTC-4 marginal posteriors this way.
January 18, 2025 at 3:44 PM
I have seen this and am already wondering if I can present the GWTC-4 marginal posteriors this way.
In 2015, the 1st gravitational-wave was detected. 11 years later, there's enough detections for patterns to emerge:
Fourth GW catalog (GWTC-4) by LIGO-Virgo-KAGRA collab shows prominent peaks around 10 & 35 solar masses. Likewise, spin and mass ratios noticeably change around 20 & 40 solar masses.
💫
Fourth GW catalog (GWTC-4) by LIGO-Virgo-KAGRA collab shows prominent peaks around 10 & 35 solar masses. Likewise, spin and mass ratios noticeably change around 20 & 40 solar masses.
💫
Analysis of gravitational-wave data indicates merging binary black holes can be grouped into three subpopulations, each with distinct masses, spin characteristics, and likely formation pathways. doi.org/hbwstp
Astronomers find evidence for three subpopulations of merging black holes
Astronomers analyzing gravitational-wave data from the LIGO-Virgo-KAGRA Collaboration have reported that merging binary black holes fall into three distinct categories.
phys.org
April 11, 2026 at 7:52 PM
In 2015, the 1st gravitational-wave was detected. 11 years later, there's enough detections for patterns to emerge:
Fourth GW catalog (GWTC-4) by LIGO-Virgo-KAGRA collab shows prominent peaks around 10 & 35 solar masses. Likewise, spin and mass ratios noticeably change around 20 & 40 solar masses.
💫
Fourth GW catalog (GWTC-4) by LIGO-Virgo-KAGRA collab shows prominent peaks around 10 & 35 solar masses. Likewise, spin and mass ratios noticeably change around 20 & 40 solar masses.
💫
How do black holes become so massive? 🧪🔭
⚫️ ➡️ 🎆 ⬅️ ⚫️
Gravitational wave data reveal black holes can pack on weight (above 45 solar masses) through a series of collisions (mergers) between other black holes in dense star clusters.
go.aps.org/4yd4KXA
⚫️ ➡️ 🎆 ⬅️ ⚫️
Gravitational wave data reveal black holes can pack on weight (above 45 solar masses) through a series of collisions (mergers) between other black holes in dense star clusters.
go.aps.org/4yd4KXA
Signatures of a Subpopulation of Hierarchical Mergers in the GWTC-4 Gravitational-Wave Dataset
Different analyses of gravitational-wave observations are converging on evidence for a distinct population of massive black hole binaries produced through repeated mergers.
go.aps.org
July 6, 2026 at 10:58 PM
How do black holes become so massive? 🧪🔭
⚫️ ➡️ 🎆 ⬅️ ⚫️
Gravitational wave data reveal black holes can pack on weight (above 45 solar masses) through a series of collisions (mergers) between other black holes in dense star clusters.
go.aps.org/4yd4KXA
⚫️ ➡️ 🎆 ⬅️ ⚫️
Gravitational wave data reveal black holes can pack on weight (above 45 solar masses) through a series of collisions (mergers) between other black holes in dense star clusters.
go.aps.org/4yd4KXA
Hierarchical Bayesian Inference on the intrinsic event rate of Type I gamma-ray bursts from the {\it Fermi}/GBM catalogue. Cao Tian-Yong et. al. https://arxiv.org/abs/2609.35994
September 30, 2026 at 6:56 AM
Hierarchical Bayesian Inference on the intrinsic event rate of Type I gamma-ray bursts from the {\it Fermi}/GBM catalogue. Cao Tian-Yong et. al. https://arxiv.org/abs/2609.35994
Beyond GWTC-3: Analysing and verifying new gravitational-wave events from community catalogues. (replaced) Daniel Williams https://arxiv.org/abs/2401.08709
January 9, 2025 at 5:48 AM
Beyond GWTC-3: Analysing and verifying new gravitational-wave events from community catalogues. (replaced) Daniel Williams https://arxiv.org/abs/2401.08709
Junlin Qin, Zhan-Feng Mai, Dicong Liang, Hai-Tian Wang, En-Wei Liang: A Catalog-Wide Study of Gravitational-Wave Residuals in GWTC-4 and GWTC-5 https://arxiv.org/abs/2609.28146 https://arxiv.org/pdf/2609.28146 https://arxiv.org/html/2609.28146
September 24, 2026 at 6:53 AM
Junlin Qin, Zhan-Feng Mai, Dicong Liang, Hai-Tian Wang, En-Wei Liang: A Catalog-Wide Study of Gravitational-Wave Residuals in GWTC-4 and GWTC-5 https://arxiv.org/abs/2609.28146 https://arxiv.org/pdf/2609.28146 https://arxiv.org/html/2609.28146
重力波イベントの最新カタログ「GWTC」第4版がリリース - アストロアーツ
www.astroarts.co.jp/article/hl/a...
www.astroarts.co.jp/article/hl/a...
重力波イベントの最新カタログ「GWTC」第4版がリリース
LIGOなどの重力波望遠鏡でこれまでに検出された重力波イベントの最新カタログが発表された。219件の現象が収録されている。
www.astroarts.co.jp
September 3, 2025 at 11:05 AM
重力波イベントの最新カタログ「GWTC」第4版がリリース - アストロアーツ
www.astroarts.co.jp/article/hl/a...
www.astroarts.co.jp/article/hl/a...
Searching for Extra Dimensions with Gravitational Waves: Dark-Siren Constraints from GWTC-4
https://arxiv.org/pdf/2606.14549
Anson Chen, Jun Zhang.
https://arxiv.org/pdf/2606.14549
Anson Chen, Jun Zhang.
https://arxiv.org/abs/2606.14549
arXiv abstract link
arxiv.org
June 15, 2026 at 4:03 AM
Searching for Extra Dimensions with Gravitational Waves: Dark-Siren Constraints from GWTC-4
https://arxiv.org/pdf/2606.14549
Anson Chen, Jun Zhang.
https://arxiv.org/pdf/2606.14549
Anson Chen, Jun Zhang.
GWTC-4.0: Tests of General Relativity. II. Parameterized Tests. The LIGO Scientific Collaboration et. al. https://arxiv.org/abs/2603.19020
July 22, 2026 at 6:21 AM
GWTC-4.0: Tests of General Relativity. II. Parameterized Tests. The LIGO Scientific Collaboration et. al. https://arxiv.org/abs/2603.19020
Model-independent H0 from GWTC-4 standard sirens and TDCOSMO 2025 strong lensing time delays. En-Yu Xiong et. al. https://arxiv.org/abs/2606.03634
June 4, 2026 at 12:56 AM
Model-independent H0 from GWTC-4 standard sirens and TDCOSMO 2025 strong lensing time delays. En-Yu Xiong et. al. https://arxiv.org/abs/2606.03634
The First Detection of Sub-Populations in the Delay-Time Distribution of Binary Black Holes in GWTC-4 of LIGO-Virgo-KAGRA. Shaunak Padhyegurjar et. al. https://arxiv.org/abs/2606.02318
June 8, 2026 at 10:44 PM
The First Detection of Sub-Populations in the Delay-Time Distribution of Binary Black Holes in GWTC-4 of LIGO-Virgo-KAGRA. Shaunak Padhyegurjar et. al. https://arxiv.org/abs/2606.02318
His legacy lives on through the discoveries we continue to make, including the GWTC-4 results that have just been announced, and through the thriving community of researchers he inspired.
August 27, 2025 at 4:14 AM
His legacy lives on through the discoveries we continue to make, including the GWTC-4 results that have just been announced, and through the thriving community of researchers he inspired.
GWTC-4.0: Updating the Gravitational-Wave Transient Catalog with Observations from the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run. The LIGO Scientific Collaboration et. al. https://arxiv.org/abs/2508.18082
August 26, 2025 at 9:30 AM
GWTC-4.0: Updating the Gravitational-Wave Transient Catalog with Observations from the First Part of the Fourth LIGO-Virgo-KAGRA Observing Run. The LIGO Scientific Collaboration et. al. https://arxiv.org/abs/2508.18082
The bias in chi_eff among the higher spin BH tests this fraction of prograde:retrograde mergers in AGN. Note also the preferred plane of the AGN weakens the strong limits on hierarchical mergers from GWTC 4, since those assume isotropic spins.
18/n
18/n
August 26, 2025 at 7:16 PM
The bias in chi_eff among the higher spin BH tests this fraction of prograde:retrograde mergers in AGN. Note also the preferred plane of the AGN weakens the strong limits on hierarchical mergers from GWTC 4, since those assume isotropic spins.
18/n
18/n
gravitational-wave observations from the Third Gravitational-Wave Transient Catalogue (GWTC-3) in conjunction with the GLADE+ galaxy catalogue, we show that restricting to bright galaxy subsets can enhance the precision of the $H_0$ estimate by up to [2/4 of https://arxiv.org/abs/2505.11268v1]
May 19, 2025 at 6:07 AM
gravitational-wave observations from the Third Gravitational-Wave Transient Catalogue (GWTC-3) in conjunction with the GLADE+ galaxy catalogue, we show that restricting to bright galaxy subsets can enhance the precision of the $H_0$ estimate by up to [2/4 of https://arxiv.org/abs/2505.11268v1]
Probing the Mass--Redshift Dependence of Binary Black Holes and its Implications for $H_0$ with GWTC-5.0. Yang Liu et. al. https://arxiv.org/abs/2609.25662
September 23, 2026 at 10:28 PM
Probing the Mass--Redshift Dependence of Binary Black Holes and its Implications for $H_0$ with GWTC-5.0. Yang Liu et. al. https://arxiv.org/abs/2609.25662
Analysis of GWTC-3 with multiple quasicircular models. N. Manning (1) et. al. https://arxiv.org/abs/2609.15827
September 15, 2026 at 6:58 AM
Analysis of GWTC-3 with multiple quasicircular models. N. Manning (1) et. al. https://arxiv.org/abs/2609.15827