GCN Circular 7435
Y. Urata, M. Im, I. Lee, K.Y Huang, W.K. Zheng, L.P. Xin on behalf of EAFON report: "We have been monitoring the GRB 080319B optical afterglow (Racusin et al. GCN 7427) using Mt. Lemmon 1m telescope with B, V, R, I and z' band filter. The brightness at about 80 min after the burst is R~16.0 mag. derived from USNO-B1.0 catalog. Comparing with the further reports by Li et al (GCN 7430), and Milen & Williams (GCN 7432), the light curve shows shallower decay from around 0.05 days after the burst. Further analysis and observations are in progress."