[vsnet-grb-info 15874] GRB 141212A: MASTER early optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17162
SUBJECT: GRB 141212A: MASTER early optical observations
DATE:    14/12/12 15:16:48 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

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

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

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

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

V.Krushinsky, I.Zalozhnih,  A. Popov
Ural Federal University, Yekaterinburg, 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)


MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in 
Tunka was pointed to the  GRB141212A 32 sec after notice time and 46 sec after 
trigger time at 2014-12-12 12:14:47 UT. On our first (10s exposure)  set we 
haven`t found optical transient  within SWIFT error-box (Ukwatta et alo., GCN 
17158) .
The 5-sigma upper limit has been about 16.8 mag

Our upper limit on first single and coadd images available on table 1:

Table 1:


T_start     T0-T_start   T0-T_mid  Exptime  Limit Coadd
    UT           s           s         s 12:14:47.1    46            51 
10     16.8   -
12:14:47.1    46           497       630     19.2   9
12:30:24.4   983          2251      2160     20.6   12

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