TITLE: GCN CIRCULAR NUMBER: 30383 SUBJECT: GRB 210704A: DDOTI upper limit DATE: 21/07/05 18:47:55 GMT FROM: Simone Dichiara at UMCP/NASA/GSFC Simone Dichiara (GSFC/UMD), Eleonora Troja (GSFC/UMD), Nat Butler (ASU), Alan M. Watson (UNAM), Rosa L. Becerra (UNAM), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), Oc��lotl Lopez (UNAM), Diego Gonzalez (UNAM), Margarita Pereyra (UNAM) and Srihari Ravi (ASU) report: We observed the field of the Fermi/LAT GRB 210704A (Berretta et al. GCN Circ. 30375, Ursi et al. GCN Circ. 30372, Malacaria et al. GCN Circ. 30380) with the DDOTI wide-field imager at the Observatorio Astron��mico Nacional on Sierra San Pedro Martir (http://ddoti.astroscu.unam.mx) starting from 2021-07-05 04:51 to 05:01 UTC (from 9 hours after the trigger). We obtained a 360 seconds of total exposure in the w filter. We find no new sources within the XRT error region reported by D'Ai et al. (GCN Circ. 30379) . Calibrating our images against the APASS catalog we obtained a 5-sigma limiting magnitude of w = 19.7. Compared to the USNO-B1, Pan-STARRS DR1, and APASS DR10 catalogs, we detect no uncataloged sources to our limit. We also noticed the presence of a galaxy cluster at z~0.2 coincident with the afterglow localization region and the presence of a bright galaxy about 30" north from the X-ray transient. We thank the staff of the Observatorio Astronomico Nacional in San Pedro Martir.