[vsnet-grb-info 14994] GRB 140516A: MASTER early optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16288
SUBJECT: GRB 140516A: MASTER early optical observations
DATE:    14/05/17 01:13:41 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, 
D.Denisenko, A.Sankovich
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
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)


MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Kislovodsk was pointed to the  GRB140516A 22 sec after notice 
time 44 sec after trigger time at 2014-05-16 20:31:39 UT in two 
polarizations. On our first (10s exposure) set we haven`t found optical 
transient  within SWIFT error-box (Bernardini et. al GCN 16285). The 
5-sigma upper limit has been about 17.0 mag.
As we have a set of observations after that with exposures from 10 to 180 
seconds during several hours.  In table 1 some limits are provided.

Table 1
-------
T_start 	   Exptime   T-T_mead  T-T_start  T-T_stop  Filter  mlimit  Coadd
2014-05-16 20:31:39     10     49 sec     44 sec     54 sec   P|     17.0    1
2014-05-16 20:31:39     10     49 sec     44 sec     54 sec   P-     16.9    1
2014-05-16 20:31:39    780    466 sec     44 sec    889 sec   P|     19.6    13*
2014-05-16 20:31:39    780    466 sec     44 sec    889 sec   P|     19.3    13*
2014-05-16 20:45:54   3600   2914 sec    899 sec   4930 sec   P|     20.6    20
2014-05-16 20:45:54   3600   2914 sec    899 sec   4930 sec   P-     20.4    20
2014-05-16 20:45:54   7200   2914 sec    899 sec   4930 sec P| + P-  21.0    40**
---------------------------------------------------------------------------------
*  This is a set images with diffrent exposure times from 10 to 180 seconds.
** We has images synchronously in 2 channels. Therefore we can increase 
twice exptime in case of constant t_start and t_stop.

P- and P| is a polarization filter which are oriented at an angle 0 and 90 
degrees to RA axis respectivel. T is a  GRB trigger time.


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