TITLE: GCN CIRCULAR NUMBER: 25352 SUBJECT: LIGO/Virgo S190814bv: No Counterparts in DDOTI/OAN Optical Observations DATE: 19/08/15 21:47:51 GMT FROM: Simone Dichiara at UMCP/NASA/GSFC Simone Dichiara (GSFC/UMD), Margarita Pereyra (UNAM), Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Diego Gonzalez (UNAM), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Eleonora Troja (GSFC/UMD), Gabriele Minervini (INAF/IAPS-Rome) and Tanner Wolfram (ASU) report: We observed LIGO/Virgo S190814bv (Mo et al, GCN Circ. 25324) with the DDOTI/OAN wide-field imager at the Observatorio Astronomico Nacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2019-08-15 UTC. We observed approximately 100 square degrees with three visits centered on 00:51:19.690 -25:14:28.9, 00:50:55.478 -27:15:38.84, and 00:52:24.972 -22:31:44.59, respectively. These regions include about 90% of the probability in the updated localization map (Mo et al, GCN Circ. 25333). We observed from 2019-08-15 07:58 UTC to 2019-08-15 11:52 UTC (10.8 to 14.7 hours after the event). We obtained about 20 minutes total exposure on each field in the w filter. We calibrate our images against the APASS catalog. Our 10-sigma limiting magnitude are typically w = 18.0 AB. Comparing our 10-sigma detections against the USNO-B1 catalog, we detect no uncataloged sources with significant fading. We thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.