GCN Circular 18513
J. Zhang, J. Mao and J. Bai (YNAO) report: We observed the field of GRB 151027A (Maselli et al., GCN 18478) with the 2.4-meter optical telescope at Gao-Mei-Gu of Yunnan Observatories. Observations began at 11:32:30 UT, Oct. 28, 2015, about 31.5 hr after the trigger. We clearly detected the afterglow of GRB 151027A. The magnitude was estimated as R=18.9 +/- 0.1 mag.