TITLE:   GCN CIRCULAR
NUMBER:  13994
SUBJECT: GRB 121125A: MASTER-NET  optical observations
DATE:    12/11/25 09:52:04 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc@observ.inetcomm.ru>

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

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

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

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

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 Blagoveschensk was pointed to the  GRB121125.36 44 sec after 
GRB time at 2012-11-25 08:33:11.383 UT. On our first (10s exposure) set we 
haven`t found optica
l transient  within SWIFT error-box (Barlow et al., GCN Circ 13993).
Unfortunately notice alert have come immodiatly after sunset when 
telescope prepearing
calibration images.

  So  5-sigma upper limit of the first images has been about 13.8 mag that 
is not very good.
We see OT (Barlow et al., GCN Circ 13993) on UVOT position on the next 
images with 14.5 mag limit (UT_start = 2012-11-25 08:34:34, 127 
s after trigger time, exp_time = 30s).

  We note that there is 16.5 mag star 9 arcsec from UVOT OT coordinates.
The observations is continuated.

  The message may be cited.