The sliding roof enclosure for 7DT at ObsTech site is being equipped. 10 units of DR500 are to be installed soon. #7DT #O4ishere

The first 10 units of DR500 are installed. We are very close to first light of 7DT. #7DT #O4ishere

Then, they are arriving at Obstech site along mounts and piers. #7DT #O4isHere

CGA is celebrating the start of #O4IsHere with the launch of its ANU-based LIGO remote control room and the addition of the ANU 2.3m Telescope to the electromagnetic follow-up campaign.
OzGrav Australian Institute of Physics Science at ANU Lilli Sun Chris Lidman Bram Slagmolen

Look at that sky localization! The first #GravitationalWave candidate of O4b #S240413p

If real, the source is probably a binary black hole

False alarm rate 1 in 100 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36075
Rating 3⃣🍨🖤

#O4IsHere

🚨 An exciting one! #GravitationalWave candidate #S240422ed

If real, the source is probably a neutron star–black hole (could have an electromagnetic counterpart)

False alarm rate 1 in 10^5 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36236
Rating 🍫🎱🥯

#O4IsHere

Hello LIGO Hanford! Both LIGO observatories are now locked and observing! #O4IsHere

Lots of time yesterday with all three detectors online. Great work LIGO Livingston LIGO Hanford and EGO & the Virgo Collaboration

Detector status pages: gwosc.org/detector_statu…

#O4IsHere

Wednesday #GravitationalWave candidate #S240501an

If real, the source is probably a binary black hole

False alarm rate 1 in 75 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36356
Rating 🐦🐦🌳

#O4IsHere

Tuesday #GravitationalWave candidate #S240430ca

If real, the source is probably a binary black hole

False alarm rate 1 in 0.43 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36353
Rating 🪿🐳

#O4IsHere

Stats on our detector performance during O4a

gwosc.org/detector_statu…

#O4IsHere

Catching up on #GravitationalWave candidate #S240421ar

If real, the source is probably a binary black hole

False alarm rate 1 in 0.88 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36205
Rating 🕊️🌅

#O4IsHere

Lovely #GravitationalWave candidate #S240428dr Great localization considering Livingston was down!

If real, the source is probably a binary black hole

False alarm rate 1 in 1.5 × 10^6 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36340
Rating 🍦🪩🦢

#O4IsHere

Start the weekend with #GravitationalWave candidate #S240426dl

If real, the source is probably a binary black hole

False alarm rate 1 in 0.6 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36321
Rating ⏺️🎉

#O4IsHere

Start the morning with #GravitationalWave candidate #S240426s

If real, the source is probably a binary black hole

False alarm rate 1 in 4.2 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36312
Rating 🐔🍩

#O4IsHere

#O4isHere LIGO FAR is increasing parallel to geomagnetic instability, and the intervals between triggers are already looking over-correlated to the geophysical foreground:

#O4IsHere well done everyone!

The new #LIGO remote control room PhysicsANU and additional Electromagnetic follow-up capabilities Siding Spring Observ puts ourANU in the centre of the global #O4IsHere observing run.
youtu.be/Ki1ZDY86qEE
Australian Institute of Physics OzGrav

Time to start observing again. #O4IsHere

Desde esta misma tarde, la humanidad es capaz de detectar mediante ondas gravitacionales la fusión de dos estrellas de neutrones en un rango de 450 millones de años-luz. Son muy necesarias para medir la constante de Hubble!! #O4IsHere