TITLE:   GCN CIRCULAR
NUMBER:  15807
SUBJECT: GRB 140206A: Mondy optical observations
DATE:    14/02/08 16:11:34 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>

A. Volnova (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), A. Pozanenko 
(IKI) report on behalf of larger GRB follow-up collaboration:

We observed the afterglow (Oksanen et al., GCN 15786; Oates et al., GCN
15787) of the Swift/INTEGRAL/Fermi GRB 140206A (Lien et al., GCN 15784;
Gotz et al., GCN 15785, Kienlin et al., GCN 15796) with AZT-33IK 
telescope of Sayan observatory (Mondy) starting on Feb. 6 (UT) 14:15. 
We clearly detect afterglow in each frame of 60 s exposure. A 
preliminary photometry of the afterglow is following:

date        Filter  UT start  Exp,s     t-T0,d    OT     err
2014-02-06   R      14:15:21    120     0.29098   18.73  0.05
2014-02-06   R      14:31:29     60     0.30185   18.59  0.07
2014-02-06   R      15:02:15     60     0.32321   18.61  0.07
2014-02-06   R      18:14:26     60     0.45667   19.01  0.08
2014-02-06   R      18:53:29     60     0.48379   19.29  0.09

The photometry is based on reference stars SDSS-DR9, (R mag,
transformation by Lupton 2005)

N   SDSS_id           R(Lupton)errR
4 J094058.58+664752.4 18.030 0.022
5 J094107.93+664422.0 19.066 0.028