[vsnet-grb-info 4039] GRB 061121: MDM Continued Monitoring

[GCN Circulars]

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.  <jules at astro.columbia.edu>

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."