TITLE:   GCN CIRCULAR
NUMBER:  14020
SUBJECT: GRB 121125A: optical upper limit
DATE:    12/11/29 17:52:31 GMT
FROM:    Alina Volnova at SAI MSU  <alinusss@gmail.com>

A. Volnova (SAI MSU, IKI), D. Varda (ISON), E. Sinyakov (ISON), I. Molotov
(KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up
collaboration:

We observed the field of GRB 121125A (Barlow et al., GCN 13993) with ORI-25
telescope of ISON-Blagoveshensk observatory starting on Nov.25 (UT)
09:05:39. We took several unfiltered images. We do not detect the OT
(Barlow et al., GCN 13993; Yurkov et al., GCN 13994; Im et al., GCN 13995)
in any combined images. A photometry of stacked image is based on nearby
USNO-B1.0 stars (R2):

T_start T0+, Filter, exposure, UL (3 sigma)
(UT) mid (d) (s)

08:58:19 0.03078 none 52 x 40 15.6