TITLE: GCN CIRCULAR NUMBER: 17236 SUBJECT: GRB 141225A: Nanshan very early optical observations DATE: 14/12/26 06:39:37 GMT FROM: Dong Xu at DARK/NBI D. Xu (DARK, NAOC) and X. Gao (Urumqi No.1 Senior High School, Xinjiang) report: We observed the field of GRB 141225A (D'Avanzo et al., GCN 17229) using the 36cm robotic telescope located at Nanshan, Xinjiang, China. Observations started at 23:04:14 UT on 2014-12-25, i.e., 187 s after the burst, and subsequently 3x40s, 4x60s, and 12x90s unfiltered images were obtained. The optical afterglow (Gorosabel et al., GCN 17230; Guidorzi et al., GCN 17231; Malesani et al., GCN 17232; Kuin & D'Avanzo, GCN 17233) is detected in all 40s and 60s exposures and only in the beginnings of 90s exposures, and is evident of decaying. The afterglow has m(R)~17.2 from the first 40s image (i.e., 187 s - 227 s post-burst), calibrated with R-band magnitudes of nearby SDSS stars.