[vsnet-grb-info 12459] GRB 121001A: MASTER optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  13834
SUBJECT: GRB 121001A: MASTER optical observations
DATE:    12/10/01 23:01:39 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <gcncirc at observ.inetcomm.ru>

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

K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk 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.Krushinski, I.Zalozhnich,  A. Popov, A. Bourdanov, A. Punanova
Ural Federal University

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 Kislovodsk was pointed  to the Swift  GRB121001A 43 s after 
notice time and 209  sec after GRB time at  2012-10-01 18:26:31 UT in a 
two  polarizations.

We haven`t found optical transient  within  SWIFT error-box (D'Elia
et al. GCN  13831)  on our first (20 s exposure) set.

The 5-sigma upper limit has been about 15.8  mag

Observations were carried out under the full moon and  on high zenith 
distance (~70 deg). Also a high  stars density  complicates the analysis.

The data reduction is continued.

The message may be cited.