[vsnet-grb-info 3942] GRB 061028: TAROT Calern observatory late optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  5764
SUBJECT: GRB 061028: TAROT Calern observatory late optical observations
DATE:    06/10/28 03:00:50 GMT
FROM:    Alain Klotz at CESR-CNRS  <Alain.Klotz at free.fr>

Klotz, A. (CESR-OMP), Boer M. (OHP), Atteia J.L. (LATT-OMP) report:

We continued to monitor the XRT error box of
GRB 061028 defined Sakamoto et al. (GCNC 5762)
with TAROT. Early observations (Klotz et al.
GCNC 5763) did not shown any OT in this area.

Under excellent weather conditions, we can
now give the following upper limit derived
from a series of co-added 180s images images:

from t0+0.44 to t0+1.07 hour : R>20.1

where t0 is the BAT trigger date.