TITLE:   GCN CIRCULAR
NUMBER:  24490
SUBJECT: LIGO/Virgo S190510g: MASTER OT detection inside low surface brightness galaxy
DATE:    19/05/11 20:28:33 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, N.Tyurina, E. Gorbovskoy, V.Kornilov, D.Vlasenko, 
P.Balanutsa,D.Vlasenko, V.Vladimirov, D.Zimnukhov, A.Kuznetsov, P.Balanutsa, 
I.Gorbunov, A. Chasovnikov, F.Balakin, V.Grinshpun, T.Pogrosheva (Lomonosov 
Moscow State University, SAI, Physics Department),

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


D. Buckley (South African Astronomical Observatory),


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


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

H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio 
ICATE,SJNU)


O. Gress, N.M. Budnev, O.Ershova (Applied Physics Institute, Irkutsk Stat 
University),

V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk EducationState 
University),

OT MASTER142812.05-013615.2 discovery.


MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 14h 
28m 12.05s -01d 36m 15.2s on 2019-05-11.03821 UT.
The OT unfiltered magnitude is 17.6m (limit 20.0m).

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

We have reference image without OT on 2016-03-09.04372 UT with unfiltered 
magnitude limit 20.3m.
There is low surface brightness galaxy (from HSC-SSP)  with 2.7 arcsec 
offset at 14 28 12.0144	-01 36 17.316
This OT  is good candidate for Gravitational Waves counterpart.

Spectral observations are required.

The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/142812.05-013615.2.png

Folow up observations are required.