TITLE:   GCN CIRCULAR
NUMBER:  25046
SUBJECT: LIGO/Virgo S190707q: MASTER OT seach result
DATE:    19/07/10 11:48:25 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),

MASTER OT J195321.61+181050.3 discovery - preliminary dwarf nova outburst 
with ampl > 4m .

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) 
= 19h 53m 21.61s +18d 10m 50.3s on 2019-07-07.83846 UT during LVC S190707q 
inspect (GCN #25012, GCN #25022).

The OT unfiltered magnitude is 16.6m (limit 17.9m).

The OT is seen in 4 images. There is no minor planet at this place.

We have reference image without OT on 2014-08-27.87829 UT with unfiltered 
magnitude limit 18.8m.

Spectral observations are required.

The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/195321.61181050.3.png

Folow up observations are required.

Up to now we cover ~700 sq. degree inside the S190707q error box, which is 
makes up  62% from 50% errorbox and 45% of full error box. The cover map 
available here.
https://master.sai.msu.ru/site/master2/ligo_1.php?id=10471