TITLE:   GCN CIRCULAR
NUMBER:  10456
SUBJECT: GRB 100206A: optical observations in CrAO
DATE:    10/02/26 03:00:50 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

V. Rumyantsev, D. Shakhovkoy (CrAO), A. Pozanenko (IKI)  report on behalf of
larger GRB  follow-up collaboration:

We observed the field of the Swift GRB 100206A (Krimm  et al. GCN  10376)
with AZT-11 telescope of CrAO between (UT) Feb. 06  16:09 -- 17:10 under
poor seeing of about 6 arcsec. No objects is detected in enhanced XRT error
circle (Goad et al. GCN 10378).

The upper limit of point like object in a stacked image based on USNO-B1.0
star  1031-0041090  (assuming R2=16.63)  is following:

T0+      Filter,   Exposure, mag.
(mid, d)              (s)

0.1315   R       20x180    > 21.7