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MASTER-IAC: very bright high amplitude OT

ATel #9824; P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra-Ricart, N. Lodieu (IAC), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Vladimirov, V. Kornilov, V. Chazov, D. Kuvshinov (Lomonosov MSU, SAI), O. Gress, N. Budnev, K. Ivanov (API Irkutsk State University)
on 5 Dec 2016; 12:08 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J030205.67+254834.3 discovery - 13.7m dwarf nova outburst with Ampl>6.4m

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 03h 02m 05.67s +25d 48m 34.3s on 2016-12-04.96045 UT.
The OT unfiltered magnitude is 13.7m (m_limit=20.3m).
The OT is seen in 4 images during MASTER-IAC survey and on 2 images in MASTER-Tunka on 2016-12-05 10:56:11.996UT.
We have reference image without OT on 2016-01-05.01958 UT with m_OT=20.6+-0.4 and unfiltered magnitude limit 21.5m.
This OT is in 19.6E,57.8N from PGC090653 galaxy with Btot=16.8+-0.5. We have reference image in MASTER-SAAO on 2016-11-18 20:24:03UT with mlim=20.6 and m_OT~20.6, it means, that there was no enough time to be a superluminous SN in classic scenario.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/030205.67254834.3.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net