TITLE: GCN CIRCULAR NUMBER: 23462 SUBJECT: GRB 181126A: No Ks-band afterglow detection with Keck I DATE: 18/11/27 01:41:58 GMT FROM: Kishalay De at Caltech, GROWTH K. De (Caltech) reports on behalf of a larger collaboration At 2018-11-26 14:13 UT, 4.32 hours after GRB 181126A (GCN 23453), we observed the location of the XRT counterpart (GCN 23455) with the MOSFIRE instrument on the Keck I telescope. With a total exposure time of 416 seconds, no afterglow is detected to a 3-sigma Ks-band limit of 23.6 AB mag.