TITLE:   GCN CIRCULAR
NUMBER:  5840
SUBJECT: GRB 061121: MDM Optical Observations
DATE:    06/11/22 20:06:25 GMT
FROM:    Jules Halpern at Columbia U.  <jules@astro.columbia.edu>

J. P. Halpern, N. Mirabal, & E. Armstrong (Columbia U.)
report on behalf of the MDM Observatory GRB follow-up team:

"We began R-band observations of GRB 061121 (Page et al.,
GCN 5823) 20.57 hr after the burst using the MDM 2.4m.
Preliminary results from raw images are:

 -----------------------------------------------------------
  Date(UT)  Mid-time(UT)  t-t0(hr)  Exp(s)      R(mag)
 -----------------------------------------------------------
  Nov. 22      11:57       20.57     300     21.06 +/- 0.03
  Nov. 22      12:49       21.44     300     21.13 +/- 0.04
 -----------------------------------------------------------

These are referenced to the USNO B1.0 magnitude R=18.02 for
the star at (J2000) R.A.=09h48m54.77s, Decl.= -13d11'17.9".
Quoted errors are statistical only.  Refined magnitudes and
additional results will be forthcoming.

This message may be cited."