TITLE: GCN CIRCULAR NUMBER: 25216 SUBJECT: S190728q: MASTER multiple previous outbursts detection of ZTF19abjethn=AT2019lvs DATE: 19/07/29 10:28:42 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov,D.Zimnukhov, V.Senik, A.Chasovnikov, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias) D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER Global Robotic Net ( http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) observed S190728q (LIGO GCN 21187) since 2019-07-28 07:00:29 UT (Lipunov et al. GCN 25183). MASTER database has previous outbursts of Zwicky Transient Facility (ZTF) OT ZTF19abjethn=AT2019lvs (Kasliwal et al. GCN25199, R.A.,Dec=326.395431 +20.690590) since 2010, preliminary automatic MASTER unfiltered photometry is the following (W=0.2B+0.8R calibrated by USNO-B1 B2,R2 thousands field stars) Date,Time_UT m_OT MASTER-site 2010-10-26 17:41:20 18.5 MASTER-Kislovodsk 2012-11-05 16:38:30 18.4 MASTER-Kislovodsk 2014-10-27 16:49:43 18.6 MASTER-Kislovodsk 2016-06-08 01:53:30 19.2 MASTER-IAC This OT reobserved by MASTER-OAFA with unfiltered m_OT=15.4 (was also observed by Zwicky again Goldstein et al. GCN 25202, Zhou et al. GCN 25201, PanSTARRS Smartt et al. GCN 25204, LCO Ahumada et al. GCN 25206, WHT Magee et al. GCN 25209 - CV classification TShao Belkin et al. GCN 25212) The message may be cited.