TITLE:   GCN CIRCULAR
NUMBER:  10455
SUBJECT: GRB 100206A: optical observations in Terskol
DATE:    10/02/26 02:58:35 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

M.Andreev,  A.Sergeev, N.Parakhin, N.Karpov (Terskol Branch of  Institute of
Astronomy), Yu. Kuznietsova (Main Astronomical Observatory NASU), V.Petkov
(Baksan Neutrino Observatory INR) and A. Pozanenko (IKI) on behalf of larger
GRB follow up collaboration report:

We observed the field of the Swift GRB 100206A (Krimm  et al. GCN  10376)
with the Z-600 telescope of Mt.Terskol observatory in R-filter  on  Feb. 06
starting at (UT) 15:49. We obtained three series under variable weather
conditions and improving seeing.

The upper limits of  point like object in combined images of  each series
are presented below.
The photometry is based on the USNO-B1.0 reference stars 1032-0043920
(assuming  R2=15.76) and 1031-0041081 (R2=15.78):

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

0.1034    R  10x120   >20.5
0.1235    R  20x120   >20.8
0.1631    R  20x120   >21.4

The nearby galaxy (Miller et al., GCN 10377, Bhattacharya et al., GCN 10380,
Guziy et al., GCN 10384, Leloudas et al., GCN 10387, Cenko et al., GCN
10389, Morgan et al., GCN 10390, Mao et al. GCN 10392, Nicuesa et al. GCN
10396) is detected in last series in coordinates (J2000) RA=03 08 39.17
Dec=+13 09 28.7  +/-0.5" and  magnitude R=21.3 +/-0.3. No objects is
detected in enhanced XRT error circle (Goad et al. GCN 10378).