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MASTER-SAAO: bright high amplitude outburst

ATel #9730; V. Gorelkina, P. Balanutsa, V. Shumkov, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Rebolo, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, O. Gress, K. Ivanov, V. Vladimirov, V. Chazov, D. Vlasenko (Lomonosov Moscow State University, SAI), S. Potter (SAAO), T. Pogrosheva, S. Shurpakov
on 7 Nov 2016; 23:54 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J062100.35-585120.5 detection - dwarf nova outburst, Ampl>4.5m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 06h 21m 00.35s -58d 51m 20.5s on 2016-11-05.90053 UT.
The OT unfiltered magnitude is 17.5 (mlim=19.2).
The OT is seen in 4 images. There is no minor planet at this place.
We have reference image on 2015-09-02.12098 UT with unfiltered mlim= 18.9m. There is GSC2.3.2 star (previous outburst in 1979y) and GALEX source ( accretion process), and absense in USNO-B1(22m POSS limit in history), i.e. more then 4.5m the ampl of current outburst.
Spectral observations are required.
The discovery and reference images are available http://master.sai.msu.ru/static/OT/062100.35-585120.5.png

MASTER OT J182053.43-394609.3 detection - bright high amplitude dwarf nova outburst, Ampl>6.1m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h 20m 53.43s -39d 46m 09.3s on 2016-10-31.78582 UT.
The OT unfiltered magnitude is 15.9m (mlim=17.9). The OT is seen in 12 images. There is no minor planet at this place.
We have reference image on 2015-02-24.08983 UT with unfiltered mlim= 19.0m.There is only GAIA source, i.e. 22mag POSS limit and more then 6.1m of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/182053.43-394609.3.png

MASTER optical transients discoveries

MASTER Global Robotic Net