MASTER: possibly Nova outburst, ampl>8m

ATel #13567; V. Shumkov, V. Lipunov, V. Kornilov, O. Gress, E. Gorbovskoy, P. Balanutsa, V. Vladimirov, N. Tyurina, A. Kuznetsov, D. Vlasenko, I. Gorbunov, D. Cheryasov, D. Zimnukhov, V. Senik, A. Chasovnikov, D. Kuvshinov, T. Pogrosheva, F. Balakin, K. Zhirkov(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), N. M. Budnev (Irkutsk State University, API), V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)
on 19 Mar 2020; 15:13 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J061642.05+435617.9 discovery - possibly Nova outburst with ampl>8m, bursted less then 22h befor detection

MASTER-Tavrida auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 )
discovered OT source at (RA, Dec) = 06h 16m 42.05s +43d 56m 17.9s on 2020-03-18.92777 UT.
The OT unfiltered magnitude is 15.0m (automatic, +-0.1, mlim=18.7).
The OT is seen in 2 images in MASTER-Tavrida,
and in 2 images in MASTER-Tunka (2020-03-19 12:42:22, 12:39:03UT)
There are 6 images without OT with mlim=19.0 in MASTER-IAC (2020-03-18 00:13:01-00:24:58UT)

Also, there are reference images on 2018-02-16.87110 UT with unfiltered mlim= 20.5m.
There is no any sources in VIZIER database. Taking into account The Pan-STARRS surrounding stars with m~23-24, the amplitude of our outburst is more then 8-9m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/061642.05435617.9.png

MASTER Global Robotic Net