TITLE: GCN CIRCULAR NUMBER: 30773 SUBJECT: GRB 210905A: DECam Detection DATE: 21/09/05 11:56:22 GMT FROM: Dougal Dobie at VAST <ddobie94@gmail.com> J. Cooke (Swinburne), S. Webb (Swinburne), D. Dobie (Swinburne), J. Zhang (Swinburne), S. Hegarty (Swinburne), A. Moller (Swinburne), S. Goode (Swinburne), R. Strausbaugh (U. of the Virgin Islands), Tim Abbott (NOIRLab), Vivek Gupta (Swinburne), Mark Suhr (Swinburne) We observed Swift GRB 210905A (Sonbas, et al., GCN 30765) with the Dark Energy Camera (DECam) at Cerro Tololo Inter-American Observatory. We performed 3x60s exposures with the i filter on September 5, from 04:46:10 to 04:50:09 UT. We make a marginal detection of a source at the position reported by Strausbaugh et al. (GCN 30769) with i=23.6. This measurement is not corrected for galactic extinction.