TITLE: GCN CIRCULAR NUMBER: 22648 SUBJECT: GRB 180418A: LCO FTN afterglow confirmation DATE: 18/04/18 07:47:13 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: The LCO 2-m Faulkes Telescope North (Hawaii) began observing Swift short GRB 180418A (D'Elia et al. GCN 22646) on April 18, 07:18:19 UT (34 minutes since the GRB) with the SDSS-I filter. We clearly detect the optical afterglow (Zheng et al. GCN 22647) with the following magnitude: Mid time since GRB     Exp        Filter         Magnitude (hrs)                  (s) ------------------------------------------------------------ 0.62                   5x60       SDSS-I         19.2 +- 0.1 ------------------------------------------------------------ as calibrated against nearby SDSS objects.