TITLE: GCN CIRCULAR NUMBER: 18443 SUBJECT: LIGO Virgo G194575: TZAC TAROT observations DATE: 15/10/22 21:06:07 GMT FROM: Michel Boer at CESR-CNRS A. Klotz, M. Boer, D. Coward, N. Seghouani, J.P. Rivet, on behalf of the TZAC collaboration (TAROT-Zadko-Aures-C2PU) collaboration report: Following GCN #18442 on the possible GW event G194575, the TAROT instruments located at the Calern Observatory (OCA - France) and La Silla Observatory (ESO - Chile) have started observations of the error box given in the above mentioned GCN. The main probability island is located too close to the Sun, but the other one is perfectly observable. We are observing currently with TAROT Calern, then, as soon as possible in Chile, the 5 following regions of 1.9° x 1.9° centred on: RA= 9.5 Dec=2.6 J2000 RA=18.5 Dec=5.5 J2000 RA=19.5 Dec=3.6 J2000 RA=20.5 Dec=5.3 J2000 RA=21.0 Dec=1.8 J2000 We will report later on the observations and results.