GCN Circular 663
R. Uglesich, N. Mirabal, J. P. Halpern, K. Vanlandingham, J. Noel-Storr (Columbia U.), R. M. Wagner, P. Eskridge (Ohio State U.) report on behalf of the MDM Observatory GRB follow-up team: "Further analysis of previously reported observations (GCN #651) of the BeppoSAX WFC localization of GRB 000424 (Piro, GCN #644) using a sensitive image subtraction technique sets a 3-sigma limit of R > 22.8 on April 26.15 UT for any fading optical transient in the error circle. Magnitudes reported here are referenced to USNO-A2.0 catalog stars nearby." This message may be cited.