TITLE: GCN CIRCULAR NUMBER: 5851 SUBJECT: GRB 061121: MDM Continuing Optical Decay DATE: 06/11/24 20:18:02 GMT FROM: Jules Halpern at Columbia U. J. P. Halpern & E. Armstrong (Columbia U.) report on behalf of the MDM Observatory GRB follow-up team: "Continuing observations of GRB 061121 for a third night on the MDM 2.4m telescope yield the following results, using the same calibration as in GCN 5847: --------------------------------------------------------- Date(UT) Mid-time(UT) t-t0(hr) Exp(s) R(mag) +/- --------------------------------------------------------- Nov. 24 11:43 68.34 900 22.32 0.04 Nov. 24 12:04 68.69 1200 22.33 0.03 Nov. 24 12:35 69.21 1500 22.41 0.03 Nov. 24 12:55 69.54 600 22.36 0.08 --------------------------------------------------------- This indicates a slight flattening or deviation from the previously fitted power-law decay. Images and light curve are posted at http://www.astro.columbia.edu/~jules/grb/061121/ This message may be cited."