TITLE: GCN CIRCULAR NUMBER: 22603 SUBJECT: GRB 180404A: LCO FTS observations DATE: 18/04/05 09:36:04 GMT FROM: Cristiano Guidorzi at Ferrara U,Italy C. Guidorzi, R. Martone (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath), A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU) on behalf of a large collaboration report: We began observing Swift GRB180404A (Gropp et al. GCN 22589) on April 4, 09:30 UT (0.36 days post burst) with the LCO 2-m Faulkes Telescope South unit in Siding Springs in the SDSS-R filter. We marginally detect the optical afterglow (Gropp et al.; Selsing et al. GCN 22591) with the following magnitude: Mid time since GRB     Exp        Filter         Magnitude (days)                 (s) ------------------------------------------------------------- 0.37                   5x120      SDSS-R         21.3 +- 0.3 ------------------------------------------------------------- as calibrated against nearby USNO UCAC4 objects.