TITLE: GCN CIRCULAR NUMBER: 15306 SUBJECT: GRB 131004A: Liverpool Telescope optical afterglow observations DATE: 13/10/05 00:06:15 GMT FROM: Drejc Kopac at Math Phys U,Slovenia D. Kopac (U. Ljubljana), R. J. Smith (LJMU), C. G. Mundell (LJMU), N. R. Tanvir (U. Leicester) and A. Gomboc (U. Ljubljana), on behalf of a large collaboration report: The 2-m Liverpool Telescope automatically began observing the field of GRB 131004A (Hagen et al., GCN 15303). We detect the optical afterglow in the position consistent with the NOT (Xu et al., GCN 15304) and TNG (Malesani et al., GCN 15305). Our preliminary photometry yields: Mid time from Exp Filter Magnitude trigger (min) (sec) ------------------------------------------- 85.1 300 i' 20.2 +- 0.1 111.3 300 i' 20.6 +- 0.1 ------------------------------------------- The magnitudes are calibrated agains I magnitudes of nearby USNO-B1.0 stars and are not corrected for the Galactic extinction.