#GravitationalWave
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cplberry.bsky.social
An evening stroll #GravitationalWave candidate #S251108fi

If real, the source is probably a binary black hole (chirp mass ~11–44 solar masses)

False alarm rate 1 in 24000 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🦢🎼⛄

[🧪🔭⚛️]
Initial sky localization. 90% area is 1,500 sq deg. Initial three-dimensional volume localization. Distance around 3.5 Gpc.
November 8, 2025 at 8:55 PM
cplberry.bsky.social
#GravitationalWave candidate #S251103f

If real, the source is probably a binary black hole (chirp mass ~11–22 solar masses)

False alarm rate 1 in 7.6×10^5 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🦆🍁🍦

[🧪🔭⚛️]
Initial sky localization. 90% area 980 sq deg. Initial three-dimensional volume localization. Distance around 2.2 Gpc.
November 4, 2025 at 11:00 AM
cplberry.bsky.social
Celebrate Wednesday with #GravitationalWave candidate #S251105aj

If real, the source is probably a binary black hole (chirp mass ~22–44 solar masses)

False alarm rate 1 in 39000 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🟦🍰🦢

[🧪🔭⚛️]
Initial sky localization. 90% area 720 sq deg. Initial three-dimensional volume localization. Distance around 2.1 Gpc.
November 5, 2025 at 1:58 PM
cplberry.bsky.social
Halloween #GravitationalWave candidate #S251031cq

If real, the source is probably a binary black hole (chirp mass ~22–44 solar masses)

False alarm rate 1 in 45 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 👻🍫

[🧪🔭⚛️]
Initial sky localization. 90% area 170 sq deg. Initial three-dimensional volume localization. Distance around 2.1 Gpc.
October 31, 2025 at 9:10 PM
cplberry.bsky.social
Celebrate Diwali with #GravitationalWave candidate #S251021u

If real, the source is probably a binary black hole (chirp mass ~22–88 solar masses)

False alarm rate 1 in 14 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🎆🐍

[🧪🔭⚛️]
Initial sky localization. 90% area 3,700 sq deg. Initial three-dimensional volume localization. Distance around 7.2 Gpc.
October 21, 2025 at 8:56 AM
cplberry.bsky.social
My afternoon nap interrupted by #GravitationalWave candidate #S251018bi

If real, the source is probably a binary black hole (chirp mass ~22–88 solar masses)

False alarm rate 1 in 100 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🐌🍦🍂

[🧪🔭⚛️]
Initial sky localization. 90% area 1,500 sq deg. Initial three-dimensional volume localization. Distance around 5.5 Gpc.
October 18, 2025 at 4:46 PM
cplberry.bsky.social
Second #GravitationalWave candidate of the day #S250927cy

If real, the source is probably a binary black hole (chirp mass ~22–44 solar masses)

False alarm rate 1 in 0.6 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🍟

[🧪🔭⚛️]
Initial sky localization. 90% area 1,600 sq deg. Initial three-dimensional volume localization. Distance around 4.1 Gpc.
September 27, 2025 at 7:42 PM
cplberry.bsky.social
Saturday #GravitationalWave candidate #/S250927ck

If real, the source is probably a binary black hole (chirp mass ~44–88 solar masses)

False alarm rate 1 in 1.0 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/42...
Rating 🖌️

[🧪🔭⚛️]
Initial sky localization. 90% area 180 sq deg. Initial three-dimensional volume localization. Distance around 4.3 Gpc.
September 27, 2025 at 5:29 PM
ligo.org
Last Sunday was the 10th anniversary of our first #GravitationalWave detection!

Join us for a thread of celebratory cakes enjoyed by members of our collaboration

First, a cake from @ozgrav.bsky.social Looks like plenty to share?

🖼️: J Powell

🧵🎂 #GW10Years
A sheet cake decorated with "Happy 10 Birthday GW150914", confetti, balloons, a binary black hole, and the data from our first detection, as well as the OzGrav logo. It is edged with some creamy frosting.
September 19, 2025 at 5:03 PM
cplberry.bsky.social
Yesterday's #GravitationalWave candidate #S250917aq

If real, the source is probably a binary black hole (chirp mass ~5.5–11 solar masses)

False alarm rate 1 in 2.9×10^5 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/41... gcn.nasa.gov/circulars/41...
Rating 🍰🐑🦢

[🧪🔭⚛️]
Updated sky localization. 90% area 5216 sq deg. Updated three-dimensional sky localization. Distance around 700 Mpc.
September 18, 2025 at 8:54 AM
ligomagazine.bsky.social
As well as looking back at the last decade, we take a peak at some recent results with behind the scenes stories about the latest #GravitationalWave catalog with Lucy Thomas, @daniel-williams.co.uk and @michaelpuerrer.bsky.social

#GW10Years
#GWTC4
A page of LIGO Magazine article "GWTC-4.0 Catalog Paper". The page includes an image showing the gravitational wave observations so far which are indicated by circles at different distances from a central point signifying the Earth. Image created by: Derek Davis/Rhiannon Udall/Caltech/LIGO-Virgo-KAGRA The page also includes a photo of one of the authors, Lucy Thomas. A page of LIGO Magazine article about GWTC-4.0. The page includes a photo of one of the authors, Daniel Williams. A page of the LIGO Magazine article about GWTC-4.0. The image at the top of the page is called the "masses in the stellar graveyard plot". It summarises the gravitational wave observations of neutron stars and black holes so far. Each object is represented by a circle and they are ordered vertically by mass. The image is full of circles representing many observations. The horizontal arrangement is purely aesthetic and appears like the spread wings of a bird. Image credit: LIGO-Virgo-KAGRA/Aaron Geller/Northwestern. The page also shows a photo of one of the authors, Michael Pürrer. A page of the LIGO Magazine article about GWTC-4.0. The image at the top of the page shows an older version of the masses in the stellar graveyard plot from 2017. This older version has far fewer observations compared to the current version (described in another image within this post). Image credit: LIGO-Virgo/Frank Elaysky/Northwestern University.
September 15, 2025 at 2:25 PM
ligo.org
Happy birthday to GW150914, our first (of many) #GravitationalWave discoveries, detected 10 years ago today!

#GW10Years 🧪⚛️🔭

🖼️: @chirpmass.bsky.social
A cartoon of a 10th birthday cake being swallowed by a black hole.
September 14, 2025 at 8:53 AM
ligo.org
A timeline of GW150914. A story that begins a billion years ago and ends with our first #GravitationalWave detection 10 years ago today

Discover more in the @ligomagazine.bsky.social ligo.org/wp-content/u...

#GW10Years ⚛️🧪🔭
Screenshot of the LIGO Magazine, showing a colorful numerical relativity simulation of GW150915 along with the headline "A perfect source: Timeline of GW150914".
September 14, 2025 at 10:29 AM
ligo.org
#GWTC4 is the latest collection of #GravitationalWave observations. In the past decade we have gone from zero to hundreds of detections!

Learn more about our discoveries, and the experiences of the team behind #GWTC4 in @ligomagazine.bsky.social

ligo.org/wp-content/u...

#GW10Years 🔭🧪⚛️
Screen shot of the LIGO Magazine, headline "A one-stop shop for new gravitational waves". The page includes a graphic showing mass, signal-to-noise ratio (SNR), and luminosity distance of gravitational wave events. Also known as the “petri dish plot”. The results from the latest observing period (O4a) have the most events, the ones at greatest distance and the ones with highest SNR. Text of the article reads "This catalog’s publication is an incredibly important moment for the LVK collaboration and for me personally. It is the culmination of more than two years of work from many hundreds of people who, at every stage of identifying and investigating the gravitational waves, have worked together in sync to make this amazing achievement happen"
September 14, 2025 at 3:40 PM
ligo.org
A new mini-documentary by our colleagues at @uofgravity.bsky.social celebrating the 10th anniversary of our first detection and the progress in #GravitationalWave astronomy

youtu.be/SqhFtkQ4f2c

#GW10Years 🔭🧪⚛️🎢
University of Glasgow celebrates 10th anniversary of first gravitational wave detection
YouTube video by University of Glasgow
youtu.be
September 13, 2025 at 1:18 PM
cplberry.bsky.social
Friday #GravitationalWave candidate #S250912f

If real, the source is probably a binary black hole (chirp mass ~44–88 solar masses)

False alarm rate 1 per 1.1×10^5 yr
GraceDB gracedb.ligo.org/superevents/...
GCN gcn.nasa.gov/circulars/41... gcn.nasa.gov/circulars/41...
Rating 🐠🍫🐚

[🧪🔭⚛️]
Updated sky localization. 90% area 300 sq deg. Updated three-dimensional volume localization. Distance around 2.7 Gpc.
September 12, 2025 at 3:38 PM
ligo.org
What a difference a decade makes! Announcing the clearest #GravitationalWave detection ever #GW250114

youtu.be/2XmZ8-XQ9jU

📓: doi.org/10.1103/kw5g...

🔭🧪⚛️☄️ #O4IsHere
GW250114 – The Clearest of Chirps
YouTube video by LIGO Virgo KAGRA
youtu.be
September 10, 2025 at 4:20 PM
ligo.org
When a black hole is formed in a merger it emits a set of #GravitationalWave frequencies, ringing like a bell

Measuring these tests the nature of black holes. #GW250114 lets us measure multiple overtones, and they agree with theory

🎞️: Pfeiffer/Buonanno/Mitman/@sxs.bsky.social

#O4IsHere ⚛️🔭☄️
September 10, 2025 at 6:07 PM
ligo.org
Catch up with everything you need to know about our latest #GravitationalWave discovery #GW250114 with our infographics

Credit: Sanika Khadkikar/Penn State & Lucy Reading-Ikkanda/Simons Foundation

#O4IsHere 🔭🧪⚛️☄️
GW250114 A very loud cousin of GW150914! Observed by: H, L Source: Binary black hole Date: January 14 2025 Time: 8:22:03 UTC No. of cycles from 30 Hz to merger: ~8 No. of ringdown cycles: ~2 Peak GW strain: ~10^21 Total energy emitted: ~5.5*10^54 erg Distance: 333 to 477 Mpc Redshift: 0.08 to 0.1 Signal-to-noise ratio: ~77 to 80 False alarm rate: < 1 per 100 yr Total mass: 65 to 67 solar masses Primary mass: 33 to 50 solar masses Secondary mass: 31 to 33 solar masses Remnant mass: 62 to 64 solar masses Primary spin: <0.24 Secondary spin: <0.26 Remnant spin: 0.67 to 0.69 Fundamental mode frequency: 241 to 253 Hz Fundamenal mode damping time: 3.8 to 5.3 ms First overtone frequency: 240 to 257 Hz First overtone damping time: 1.2 to 1.7 ms Deviation from Kerr: −20% to +40% Components' area: 2.4*10^5 km^2 Remnant area: 4.1*10^6 km^2 Area increase: ~65% Quadrupole mode matches Kerr: Within ~2% Hexadecapole mode matches Kerr: Within ~62% Best PN paramter bound: Within ~3% Remnant mass: −6% to +7% of Kerr When two black holes (BHs) collide and merge, they release gravitational waves. These waves can be detected by sensitive instruments on Earth, allowing scientists to determine the mass and spin of the BHs. The clearest BH merger signal yet, named GW250114, recorded by LIGO in January 2025, offers new insights into these mysterious cosmic giants. Telling Overtones A fleeting secondary tone was detected in the signal, offering a rare chance to test the “Kerr solution,” which describes a rotating BH using only mass and spin. Excitingly, the mass and spin values from this overtone matched those from the fundamental tone. If they had differed, it would imply that additional properties are necessary to describe a BH, but a match confirms that — at least for this BH — no other details are needed. Forever Growing The signal also tested Hawking’s area theorem, which states that a BH’s surface area can never decrease —it can only grow. Surface area of a BH is determined by the area of its event horizon and is proportional to the square of the BH’s mass. Comparing the BHs before and after the merger confirmed that the surface area had increased, supporting the theorem.
September 11, 2025 at 2:07 AM
cplberry.bsky.social
An evening with sticky toffee pudding and a new #GravitationalWave candidate #S231113bw

If real, the source is probably a binary black hole

False alarm rate 1 in 2.3 yr
GraceDB https://gracedb.ligo.org/superevents/S231113bw/view/
GCN https://gcn.nasa.gov/circulars/35016
Rating...
November 13, 2024 at 8:26 AM
cplberry.bsky.social
A #GravitationalWave candidate to cheer up a rainy morning #S240527fv

If real, the source is most probably a binary black hole. Remarkable sky localization!

False alarm rate 1 in 2.2 yr
GraceDB https://gracedb.ligo.org/superevents/S240527fv
GCN...
November 13, 2024 at 8:14 AM
cplberry.bsky.social
Afternoon #GravitationalWave candidate #S240627by

If real, its source is probably a binary black hole

False alarm rate 1 in 2.6 yr
GraceDB https://gracedb.ligo.org/superevents/S240627by
GCN https://gcn.nasa.gov/circulars/36772
Rating 🌭👋

#O4IsHere
November 13, 2024 at 8:14 AM
cplberry.bsky.social
Saturday #GravitationalWave candidate #S240629by

If real, the source is probably a binary black hole

False alarm rate 1 in 100 yr
GraceDB https://gracedb.ligo.org/superevents/S240629by/
GCN https://gcn.nasa.gov/circulars/36784
Rating 🚞🍫👋

#O4IsHere
November 13, 2024 at 8:14 AM
einsteintelescope.bsky.social
The LVK collaborations released GWTC-4.0, adding 128 new #gravitationalwave events from O4a, including the most massive black hole merger yet. Explore the data and interactive plots here: media.ligo.northwestern.edu/gallery/mass...
Colorful chart of black hole and neutron star masses detected by LIGO–Virgo–KAGRA, showing hundreds of cosmic collisions.
September 2, 2025 at 10:17 AM
koppenburg.ch
Another effect of the #gravitationalwave : for the 1st time I have more followers than followees. Thanks to the 263 accounts reading this.
December 1, 2024 at 6:11 PM