TITLE:   GCN CIRCULAR
NUMBER:  32877
SUBJECT: LIGO-Virgo-KAGRA and GEO600 statement on GRB 221009A
DATE:    22/10/28 15:30:08 GMT
FROM:    Francesco Pannarale at LIGO-Virgo-KAGRA Collaboration  <francesco.pannarale@ligo.org>

None of the LIGO, Virgo, or KAGRA detectors were in observing operation
at the time of GRB 221009A. The detectors are currently being prepared
for the O4 observing run, which is expected to begin in March 2023. The
observing run planning can be viewed here:
https://observing.docs.ligo.org/plan/

GEO600 was taking data at the time of GRB 221009A. However, its
sensitivity is insufficient to detect any viable GRB progenitor at the 
estimated z=0.151 (de Ugarte Postigo et al. GCNC 32648), and the data
show no evidence of an astrophysical transient at the time of GRB 221009A.