MASTER PSN in anonymous galaxy from LIGO/Virgo S190930t and S190930s error-fields

ATel #13151; P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo, M. Serra (IAC), V. Kornilov, N. Tiurina, F. Balakin, A. Kuznetsov, V. Vladimirov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, T. Pogrosheva, K. Pozdnyakov, A. Chasovnikov, V. Topolev, V. Shumkov, D. Kuvshinov (Lomonosov MSU), D. Buckley(SAAO), O. A. Gres, N. M. Budnev, O. Ershova (ISU, API), R. Podesta, C. Lopez, F. Podesta, C. Francile (OAFA SJNU), H. Levato (ICATE, SJNU), A. Tlatov, D. Dormidontov (Pulkovo observatory, KSS), V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk SPU)
on 1 Oct 2019; 17:39 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J205329.99+224421.2 discovery - SN in anonymous edge-on galaxy from LIGO/Virgo NSBH event (S190930t, 108 +-37Mpc) and from S190930s (752 +- 223 Mpc)

(AT2019rpr)

MASTER Global Robotic Net (http://observ.pereplet.ru, Lipunov et al.,2010, Advances in Astronomy,vol.2010, 30L)
inspected 2 LVC error-boxes:
LIGO/Virgo S190930t (LVC GCN #25876, Lipunov et al. GCN #25875 https://master.sai.msu.ru/site/master2/ligo_1.php?id=10866 , Ttrig=2019-09-30 14:34:07 UT)
and
LIGO/Virgo S190930s (LVC GCN #25871, Lipunov et al. GCN #25870 https://master.sai.msu.ru/site/master2/ligo_1.php?id=10856 Ttrig=2019-09-30 13:35:41 UT)

MASTER-IAC auto-detection system discovered OT source at
(RA, Dec) = 20h 55m 29.78s +22d 07m 25.5s on 2019-09-30.90192 UT.

The OT unfiltered magnitude is 18.3m (limit 19.3m).
The OT is seen in 2 images on 2019-09-30 and on 6 images on 2019-10-01 (now). There is no minor planet at this place.

We have reference image without OT on 2016-09-23.93716 UT with unfiltered magnitude limit 20.1m, the nearest in time is at 2019-09-01 17:36:58UT with mlim=19.4.

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/205529.78220725.5.png

MASTER Global Robotic Net