aVIRGO, Pisa Italy

KAGRA, west Japan (Kamioka mine)

Cryogenic, 3Km arms

Maybe India-- (LIGO offered

their other Hanford detector to

India- awaiting final decision )

Modi agreed 2 days after detection.

LIGO, VIRGO operated for about 10 years. Saw nothing

Advanced LIGO, VIRGO.-- Heavier mirrors, better isolation

increased laser power, better mirror coatings,....

3-10 times more sensitive.

GEO600 ,Hanover, Germany (Test Bed)

Others:

(None operating at the time)