TITLE:   GCN CIRCULAR
NUMBER:  20748
SUBJECT: LIGO/Virgo G275404: MASTER bright OT detection 
DATE:    17/02/26 08:01:03 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>

V.M.  Lipunov, T.Pogrosheva, E. Gorbovskoy, N.Tyurina, V.Shumkov,
  P.Balanutsa, V.G. O.Gress, Kornilov, A.Kuznetsov, M.I.Panchenko, A.V.Krylov, 
I.Gorbunov
Lomonosov Moscow State University, Sternberg Astronomical Institute

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


N.M. Budnev, O. Gress, K. Ivanov, S.Yazev
Irkutsk State University

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

R.Podesta, C.Lopez, F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA) , National University of San
Juan, Argentina

H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina

R. Rebolo, M. Serra-Ricart, G. Israelian, N.Lodiu
The Instituto de Astrofisica de Canarias

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

MASTER OT J105958.00-115756.5 - possble new CV ?

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic 
Net", Advances in Astronomy, 2010, 30L )
  discovered OT source at (RA, Dec) = 10h 59m 58.00s -11d 57m 56.5s on 
2017-02-25.96032 UT during LIGO/Virgo G275404 (GCN 20738).

The OT unfiltered magnitude is 17.1m (mlim = 20.0).

The OT is seen in 2 images. There is no minor planet at this place.

We have reference image on 2015-05-17.82159 UT with  unfiltered mlim= 
20.0m.
There is GALEX-DR5 source in half pixel offset.

Spectral observations are required.