[vsnet-grb-info 11275] GRB 111215A: MASTER-Net optical prompt and follow up observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12687
SUBJECT: GRB 111215A: MASTER-Net optical prompt and follow up observations
DATE:    11/12/15 17:53:12 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, 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

  E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda,
  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, T.Kopytova, A. Popov
  Ural State University, Kourovka

3 Robotic telescopes MASTER II was pointing to the GRB111215A (Oates et 
al., GCN CIRCULAR NUMBER:  12681). Two very wide field cameras 
was observed Swift error box before, during and after GRB trigger time.

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Tunka(Siberia) was pointed to the  GRB111215A 26 sec s after 
notice time and 381 sec after GRB time at 2011-12-15 14:10:29.44 UT in two 
polarizarions.  On our first (80s exposure) set we haven`t found optical 
transient  within SWIFT error-box (ra=23 18 12 dec=+32 28 47 r=0.050000).
  The 5-sigma upper limit has been about 18.8 mag

  MASTER II  robotic telescope 
located in MASTER-Amur was pointed to the  GRB111215A 214 sec s after 
notice time and 567 sec after GRB time at 2011-12-15 14:13:35.289 UT in 
two diagonal  polarizarions. On our first (110s exposure) set we haven`t 
found optical transient  within SWIFT error-box.
The 5-sigma upper limit has been about 17.5 mag

MASTER II  robotic telescope 
located near Kislovodsk was pointed to the  GRB111215A 7655 sec s after 
notice time and 8007 sec after GRB time at 2011-12-15 16:17:35.91 UT 
(time delay is so long  due to weather conditions). On 
our first (180s exposure) set we haven`t found optical transient  within 
SWIFT error-box.
The 5-sigma upper limit has been about 18.1 mag

Two   MASTER Very Wide Field Cameras located at Tunka
(D=68 mm, 420 square degrees, 11 Mpx) was observed  GRB error box
with 5 s exposure  befoure, during and after GRB Trigger Time
without time gap between images.

Our unfiltered images are calibrated relative to Tycho stars (V).
The magnitude limit of the each emage is  12.0 m at the edge of FOW.

We do not detect OT.
The video from MASTER VWF cameras is available at
http://master.sai.msu.ru/static/GRB111215/grb111215.html

The reduction is continuated.

  The message may be cited.