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MASTER-Tunka: bright 6mag ampl dwarf nova outburst and OT from MASTER-SAAO

ATel #9747; O. Gress, P. Balanutsa, V. Lipunov (Lomonosov MSU), D. Buckley, S. Potter (SAAO), N. Budnev, K. Ivanov (API, ISU), N. Tiurina, E. Gorbovskoy, A. Kuznetsov, V. Kornilov, V. Vladimirov, V. Chazov, D. Kuvshinov (Lomonosov MSU, SAI)
on 12 Nov 2016; 08:05 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables

MASTER OT J073704.36+250054.5 discovery - bright high amplitude OT (dwarf nova) with Ampl>6m (only Sloan star in VIZIER)

MASTER-Tunka auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 07h 37m 04.36s +25d 00m 54.5s on 2016-11-09.74453 UT.
The OT unfiltered magnitude is 16.0m (mlim=18.4m).
The OT is seen in 3 images on 2016-11-09 (m_OT=16.0) and on 2012-03-13 13:29:58.007,14:17:04.183 (previous outburst) with m_OT=16.0.
We have reference image without OT on 2016-03-11 14:23:25 UT with unfiltered magnitude limit 19.9m.

There is Sloan star with g=22.5+-0.1,r=22.5+-0.2 in 0.66". So the Ampl of current outburst is more then 6m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ073704.36+250054.5.jpg

MASTER OT J183836.85-291752.4 detection

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h 38m 36.85s -29d 17m 52.4s on 2016-11-09.76800 UT.
The OT unfiltered magnitude is 11.0m (mlim=17.2).
The OT is seen in 22 images.
There is Mis V0661 star in AAVSO database with unknown type of variability https://www.aavso.org/vsx/index.php?view=detail.top&oid=131297.
MASTER photometry:
Date, UT | Filter | MASTER-Observatory | magnitude

 
2011-08-01 16:16:09.842	W Tunka(W) 13.2 
2011-08-01 17:14:38.101	I Tunka(E) 11.2 
2015-08-05 21:41:41.054 W IAC      13.8 
2016-05-01 03:33:35.627	W IAC      12.9 
2016-08-19 23:11:36.253 W IAC      13.2 
2016-08-30 20:57:27.076 W IAC      13.2 
2016-11-09 18:22:21.969	W SAA      11.0 

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/183836.85-291752.4.png

MASTER Global Robotic Net