GCN Circular 17335
D. A. Perley (Caltech) and S. B. Cenko (NASA/GSFC) report: We obtained further observations at the position of the optical afterglow (Perley, GCN 17315) of GRB 150120B (D'Elia et al., GCN 17314) with the Palomar 60-inch robotic telescope on the night of 2015-01-21 UT. In a combined stack of five 300-second r-band exposures we no longer detect any significant emission at the location of the optical afterglow. We estimate a limiting magnitude of r>22.7 mag (3 sigma) at a mid-time of 02:32:27 UT, t=0.799 days after the GRB. Relative to our previous observations, this suggests a decay power-law slope of at least alpha>0.75.