TITLE:   GCN CIRCULAR
NUMBER:  12789
SUBJECT: GRB 111228A: MASTER-Net optical photometry 
DATE:    11/12/31 08:48:50 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

  V.Krushinski, I.Zalozhnich, A. Popov
  Ural State University, Kourovka


E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda,
  Blagoveschensk Educational State University, Blagoveschensk

  E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski,
N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov,  A.Kuznetsov,
D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov,
A.Sankovich, S. Shurpakov
  Sternberg Astronomical Institute, Moscow State University

  K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, 
O.Chuvalaev,E.Konstantinov,
  Irkutsk State University

  A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
  Kislovodsk Solar Station of the Pulkovo Observatory


MASTER II  robotic double telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Blagoveschensk was pointed
to the  GRB111228A (Ukwatta et al., GCN Circ R12737) 191 sec  after notice 
time and 244 sec after
GRB time at 2011-12-28 15:48:47.127 UT (Sinykov et al., GCN Circ 12756).

MASTER II  robotic double telescope (MASTER-Net: 
http://observ.pereplet.ru)
located near Kislovodsk was pointed
to the  GRB111228A  ~6.5 hours after
GRB time at 2011-12-28 22:24:47 UT.

The results of our photometry are:


    Date        UT       Exp  mag   Err      Filter
               Start     (s)

2011-12-28  15:48:47.1   20  16.9  0.2       P|
2011-12-28  15:48:47.1   20  16.5  0.2       P-
2011-12-28  15:49:34.7   30  17.1  0.2       P|
2011-12-28  15:49:34.7   30  16.7  0.2       P-
2011-12-28  15:50:37.3   40  16.8  0.2       P|
2011-12-28  15:50:37.3   40  17.3  0.2       P-
2011-12-28  15:51:43.1   50  17.6  0.2       P|
2011-12-28  15:51:43.1   50  17.5  0.2       P-
2011-12-28  15:52:59.7   70  16.8  0.2       P|
2011-12-28  15:52:59.7   70  17.1  0.2       P-
2011-12-28  15:54:41.3   90  17.3  0.2       P|
2011-12-28  15:54:41.3   90  17.3  0.2       P-
2011-12-28  15:56:38.4  110  17.0  0.2       P|
2011-12-28  15:56:38.4  110  17.6  0.2       P-
2011-12-28  16:01:44.8	180  17.3  0.2       P|
2011-12-28  16:01:44.8  180  17.6  0.2       P-
2011-12-28  22:24:47.9 	180  19.0  0.3       V
2011-12-28  22:24:47.9  180  18.3  0.3       R
2011-12-28  22:28:14.1	180  18.9  0.3       V
2011-12-28  22:28:14.1  180  18.8  0.3       R
2011-12-28  22:31:42.7	180  19.3  0.3       V
2011-12-28  22:31:42.7  180  18.6  0.3       R
2011-12-29  00:13:44.5  180  18.8  0.3       R
2011-12-29  00:17:12.7  180  19.4  0.3       R
2011-12-29  00:20:45.7  180  18.9  0.3       R
2011-12-29  00:20:45.7  180  19.5  0.3       V
2011-12-29  01:45:51.9  180  19.4  0.3       R
2011-12-29  01:52:48.1  180  18.7  0.3       R

P|, P-   - are the 2 polarisations in white

The message may be cited.