GCN Circular 16875

E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya,  V.Kornilov, D.Kuvshinov, N.Tyurina, 
P.Balanutsa, A.Kuznetsov, V.V.Chazov, D.Denisenko
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A. Gabovich
Blagoveschensk Educational State University, Blagoveschensk

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

V.Krushinski, I.Zalozhnih,  A. Popov
Ural Federal University, Kourovka

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)


Two MASTER II twin  robotic telescope (MASTER-Net: 
http://observ.pereplet.ru)  located in  Blagoveschensk  and Kislovodsk was 
pointed to the  GRB140930B (Pasquale et. al GCN 16857
Not found
 
 
) 21 and 36 sec after
notice time and  39 and 54 sec after trigger time respectively.

So we have 4 first images in four different polarization started after 21 
sec (Blagoveschensk) and 36 sec (Kislovodsk) with 10 sec exposure.
We found 3-sigma OT    on one  tube image in Blagoveschensk at the
WHT  position (Tanvir et. al, GCN16861
Not found
 
 
, Fong et. al. GCN16863
Not found
 
 
) with m = 
16+-0.5 mag. The OT seen at one first image only.
The image with OT is available at 
http://master.sai.msu.ru/static/GRB/GRB140930B_MASTER_OT.png

We do not see OT (Tanvir et. al GCN16857
Not found
 
 
, Fong et. al. GCN16857
Not found
 
 
) on three
tube images on single and coadd images.
The analysis strongly is complicated by presence of very bright star (USNO 
B1 1142-0005722 ~14m) close to OT position. 
The upper limits received by MASTER are given in the table below:


t_start      | t-t_mid    | exptime | filt | lim  | site | coadd
--------------------------+---------+------+------+------+-------
19:42:21.909 | 44 sec     |      10 | P/   | 16.4 | A    |     1
19:42:21.909 | 44 sec     |      10 | P\   | 15.7 | A    |     1*
19:42:36.837 | 59 sec     |      10 | P|   | 15.6 | K    |     1
19:42:36.837 | 59 sec     |      10 | P-   | 16.0 | K    |     1
19:42:21.909 | 70 sec     |      40 | P/   | 17.3 | A    |     3
19:42:36.837 | 98 sec     |      50 | P-   | 16.9 | K    |     3
19:42:21.909 | 130 sec    |     130 | P/   | 18.5 | A    |     6
19:44:26.834 | 243 sec    |     120 | P-   | 18.0 | K    |     3
19:42:36.837 | 188 sec    |     170 | P-   | 18.6 | K    |     6
19:42:36.837 | 692 sec    |    1060 | P-   | 19.9 | K    |    13
19:42:21.909 | 698 sec    |    1160 | P/   | 19.7 | A    |    14
20:29:14.938 | 6120 sec   |    5400 | C    |~21.5 | K    |    30

* possible OT

C is  our white (clear) band which is well described by a parity 0.8R+0.2B (USNO B1).

P/ and P\ is a polarization filter which are oriented at an angle 45 and 
135 degrees to RA axis respectivel. P- and P| is a polarization filter 
which are oriented at an angle 0 and 90 degrees to RA axis respectivel.

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