TITLE: GCN CIRCULAR NUMBER: 19270 SUBJECT: GRB 160408A: GMG observation limit DATE: 16/04/10 02:50:48 GMT FROM: Jirong Mao at Yunnan Obs W.-M. Yi, J. Mao and J.-M. Bai (YNAO) report: We observed the field of GRB 160408A (Evans et al., GCN 19260) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. Observations began from 15:10:26 UT, Apr. 8th, 2016, about 9 hours after the trigger. We did not detect any source at the afterglow position (Levan et al. GCN 19269) down to a limit of R~23.3 mag.