TITLE: GCN CIRCULAR NUMBER: 18455 SUBJECT: LIGO/Virgo G194575: RATIR Observations of Nearby Galaxies in the 1sigma Error Region DATE: 15/10/23 18:58:55 GMT FROM: Nat Butler at Az State U Nat Butler (ASU), Neil Gehrels (GSFC), V. Zach Golkhou (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Eleonora Troja (GSFC), Alan M. Watson (UNAM) report: We observed 26 nearby galaxies (D<10 Mpc) within the GWGC catalog (White, et al. 2011) and also contained with the LIGO/Virgo G194575 1-sigma confidence interval (Singer, et al. GCN 18442) between RA 23.1 hours and RA 1.5 hours (J2000) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir on the night of 2015/10/23. We obtained a total exposure of 8 minutes on each field, reaching typical depths of r and i = 21 mag, and z = 17 mag (10-sigma). These magnitudes are in the AB system and are not corrected for Galactic extinction. Each field, centered upon one GWGC galaxy, has a size of approximately 5 by 5 arcmin^2. Analysis is ongoing. We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir. Continued observations are planned. [GCN OPS NOTE(27oct15): The Trigger number was changed from "G19457" to "G194575" in the Subject-line and the first paragraph.] [GCN OPS NOTE(27oct15): This is a duplicate of LVC Circ 18453.]