TITLE: GCN CIRCULAR NUMBER: 21779 SUBJECT: LIGO/Virgo G298048: Possible Plateau in Ks band revealed by continued Gemini-South observations DATE: 17/08/31 18:32:01 GMT FROM: Leo Singer at NASA/GSFC L. P. Singer (NASA/GSFC), R. Lau (Caltech), and M. M. Kasliwal (Caltech) report on behalf of the Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration: We report continued near-infrared observations in J, H, Ks band on the FLAMINGOS-2 instrument on Gemini-South through 2017-08-31 UT. The source seems to have ceased fading between 2017-08-28 UT and 2017-08-29 UT and reached a plateau at about Ks = 17.7 mag (Vega).