MASTER: bright PSN in PGC3074107

ATel #12834; V. Lipunov, T. Pogrosheva (Lomonosov MSU), N. Tiurina, E. Gorbovskoy, A. Kuznetsov, O. Gress, I. Gorbunov, P. Balanutsa, V. Kornilov, V. Vladimirov, D. Zimnukhov, F. Balakin, A. Chasovnikov, V. Topolev, V. Senik, V. Grinshpun, T. Pogrosheva, D. Kuvshinov (Lomonosov MSU), V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (BSPU), N. M. Budnev, O. Ershova (API ISU), A. Tlatov, D. Dormidontov, A. V. Parhomenko (KSS of the Pulkovo Observatory), R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), D. Buckley (SAAO), R. Podesta, C. Lopez, C. Francile, F. Podesta (OOAFA, SJNU), H. Levato (ICATE, SJNU), V. Shumkov
on 3 Jun 2019; 17:10 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J120315.71-525727.2 discovery- PSN in 1.1"E,6.3"S of PGC3074107

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 12h 3m 15.71s -52d 57m 27.20s on 2019-06-03 01:34:01UT (during S190602aq inspection (Shawhan et al. GCN #24717,Lipunov et al. GCN #24721), but OT is not connected with binary black holes merging).
The OT unfiltered magnitude is m=16.9 (mlim=18.6m). The OT is seen in 2 inspect images. There is no minor planet at this place. We reobserved it at 2019-06-03 16:39:45UT with m_OT=16.7 (MASTER-SAAO).
We have reference image without OT on 2019-04-24 22:43:07 UT with unfiltered mlim=18.6 m.
This PSN is in 1.1"E,6.3"S of PGC3074107 (with unknown V).
In the case of CV between MASTER and PGC3074107 the ampl of outburst is more then 5m (POSS limit)
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/MASTEROTJ120315.71-525727.2.jpg
The TNS number is 2019gtv

MASTER OT J215411.42-651801.3 discovery - new OT with ampl>4m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 21h 54m 11.42s -65d 18m 01.3s on 2019-06-02.96816 UT during the survey.
The OT unfiltered magnitude is 18.0m(mlim=20.1).
The OT is seen in 9 images. There is no minor planet at this place.
We have reference image on 2018-08-12.02311 UT with unfiltered mlim= 20.2m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/215411.42-651801.3.png
The TNS number is 2019gvm

MASTER Global Robotic Net