TITLE: GCN CIRCULAR NUMBER: 5853 SUBJECT: GRB 061121: MDM Continued Monitoring DATE: 06/11/25 19:45:51 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 fourth 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. 25 11:42 92.33 900 22.69 0.06 Nov. 25 12:02 92.66 900 22.64 0.05 Nov. 25 12:20 92.96 900 22.75 0.08 --------------------------------------------------------- A power-law decay index of -0.979+/-0.015 is fitted to the four nights. Images and light curve are posted at http://www.astro.columbia.edu/~jules/grb/061121/ This message may be cited."