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

Tuesday #GravitationalWave candidate #S240507p

If real, the source is probably a binary black hole

False alarm rate 1 in 50 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36404
Rating ⚫️🐤🐞

#O4IsHere #BlackHoleWeek

Sunday #GravitationalWave candidate #S240505av

If real, the source is probably a binary black hole

False alarm rate 1 in 1.4 yr
GraceDB gracedb.ligo.org/superevents/S2…
GCN gcn.nasa.gov/circulars/36397
Rating ☀️⛵️

#O4IsHere

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

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

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

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

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

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

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 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

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

Time to start observing again. #O4IsHere

Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real. Please be real.

#O4IsHere