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GCN Circular 23693

Subject
GRB 190114C: MASTER 4-polarizations filters OT detection
Date
2019-01-14T22:14:54Z (6 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, N.Tyurina, A.Kuznetsov, E. Gorbovskoy, V.Kornilov, 
D.Kuvshinov, P.Balanutsa,D. Vlasenko, V.Vladimirov, A.Kuznetsov,
A. Chasovnikov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

D. Buckley, S. Potter, 
South African Astronomical Observatory

V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev
Blagoveschensk Educational State University, Blagoveschensk

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

O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University

R. Podesta, C. Lopez, C.Francile, F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato 
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)


MASTER-SAAO robotic telescope (Global MASTER-Net: 
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, 
vol. 2010, 30L) located in South Africa (South African Astronomical 
Observatory) was pointed to the  GRB190114C  (Gropp et al., GCN 23688Not found
 
 
) 
24 sec after notice time and 45 sec after trigger time
at 2019-01-14 20:57:48 UT. On our first (10s 
exposure in two polarization)  set we  found 1 optical transient (Tiurina 
et al., GCN 23690Not found
 
 
) within SWIFT error-box (ra=54.5042 dec=-26.9383 r=0.05)
brighter than 17.3 .


  T-Tmid      Date      Time       Expt.        Ra                Dec           Mag
--------|--------------------|-------|-----------------|-----------------|-------
     50    2019-01-14 20:57:48    10   (03h 38m 01.15s , -26d 56m 47.07s)    11.10

The 5-sigma upper limit has been about 17.32mag

Taking into account the observations on the MASTER-IAC at Canaries 
(Tiurina et al., GCN 23690Not found
 
 
) , we have a polarization photometry  in 4-position angles!

The message may be cited.


====================================================================


The galactic latitude b = -53 deg., longitude l = 222 deg.
The observations made on zenit distance = 31 deg.The moon (56 % bright 
part) is 22 deg. above the horizon. The distance between  moon and  object 
is 41
The sun  altitude  is -30.6 deg.
The object can be observed till 2019-01-15 01:56:12
.


The 5-sigma upper limit has been about 16.54mag
The message may be cited.