GCN Circular 24509

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 J135130.87-525534.4 (2019fcc) - OT inside PGC087378

MASTER-OAFA auto-detection system ( <A 
HREF="http://www.hindawi.com/journals/aa/2010/349171/">Lipunov et al., 
"MASTER Global Robotic Net",
Advances in Astronomy, 2010, 30L</A> ) discovered OT source at (RA, Dec) = 
13h 51m 30.87s -52d 55m 34.4s on 2019-05-12.29047 UT.
The OT unfiltered magnitude is ~ 17m (mlim=18.4m).

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

We have reference image without OT on 2016-07-06.02547 UT with magnitude 
limit in 'clear' filter 19.0m.

THe OT offset from center of the PGC087378 galaxy is 2.1E 11S.
The distance is about ~50Mpc.

The same transient we see 12 hours after trigger time in MASTER-SAAO 
database.

Folow up observations are required.