[vsnet-grb-info 4037] GRB 061121: MDM Continuing Optical Decay

[GCN Circulars]

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.  <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 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."