TITLE: GCN CIRCULAR NUMBER: 12382 SUBJECT: GRB 110918A: Liverpool Telescope optical observations DATE: 11/09/21 22:18:29 GMT FROM: Drejc Kopac at Math Phys U,Slovenia C. Guidorzi (U. Ferrara), D. Kopac (U. Ljubljana) and N. R. Tanvir (U. Leicester), on behalf of a large collaboration report: We observed the optical afterglow of GRB 110918A (Cenko et al., GCN 12367) with the 2-m Liverpool Telescope, starting at 01:07 UT on 2011 September 21. We took 6 images in R band with exposure time 300s and we clearly detect the optical afterglow. Our preliminary photometry yields: Mid time from Exp Filter Magnitude trigger (days) (sec) ------------------------------------------- 2.16 1800 R 19.7 +- 0.1 ------------------------------------------- The magnitude is calibrated against nearby USNO-B1.0 stars and is not corrected for the Galactic extinction.