TITLE: GCN CIRCULAR NUMBER: 18454 SUBJECT: LIGO Virgo G194575: MWA Observations DATE: 15/10/23 18:28:54 GMT FROM: David Kaplan at UW-Milwaukee D. Kaplan (UWM), S. Croft (UC Berkeley/Eureka Scientific), K. Bannister (CSIRO), T. Murphy (Sydney University), A. Rowlinson (UvA/Astron), M. Bell (CSIRO), S. Tingay (Curtin University), R. Wayth (Curtin University), T. Franzen (Curtin University), A. Williams (Curtin University) on behalf of the Murchison Widefield Array collaboration report: We observed a single pointing designed to cover the majority of the sunward-lobe of the skymap of the advanced LIGO/Virgo trigger G194575 with the Murchison Widefield Array radio telescope. The observation covers roughly 30deg x 30deg (FWHM) centered at: 13:20:00 -12:42:00 2015-10-23T03:49:19 UT (see attached image, where the sky probability is plotted logarithmically). The observations are at a center frequency of 154 MHz, with a 30 MHz bandwidth with 0.5s integrations and 40 kHz frequency resolution. This field will be reobserved in roughly 2 weeks. Analysis is ongoing. [cid:C6D6DF20-687D-498E-BEB4-14C80AF0818A@arizona.edu]