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MASTER-SAAO and MASTER-IAC dwarf nova outbursts

ATel #8277; P. Balanutsa, O. Gress, V. Shumkov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo (IAC), D. Buckley (SAAO), N. Tiurina, V. Kornilov, A. Kuznetsov, I. Gorbunov, D. Vlasenko (M. V. Lomonosov Moscow State University, SAI), M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), S. Potter, A. Kniazev, M. Kotze (South African Astronomical Observatory)
on 11 Nov 2015; 23:52 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J182927.98-773749.5 discovery - dwarf nova outburst with Ampl>2.3m

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 18h 29m 27.98s -77d 37m 49.5s on 2015-11-06.87134 UT.
The OT unfiltered magnitude is 17.8m (limit 19.4m).
The OT is seen in 2 images. There is no minor planet at this place. We have reference image without OT on 2015-09-08.81086 UT with unfiltered magnitude limit 20.1m.
There is IGSL star(and USNO-B1,etc) with B=21.299 and R=19.813, no I, no JHK. So we suggest the dwarf nova outburst with amplitude more then 2.3m .
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/182927.98-773749.5.png

MASTER OT J182913.50+310624.2 discovery - dwarf nova outburst with Ampl>3.9m, no VIZIER

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 18h 29m 13.50s +31d 06m 24.2s on 2015-11-03 22:18:26.093UT with the unfiltered magnitude m_OT=18.3 (the limit is 19.4m).
There are 16 images with OT in 3 days (2015-11-04 20:44:38.853 with m_OT=18.1, 2015-11-05 20:53:15.023 m_OT=18.5). There is no minor planet at this place.
We have reference image without OT on 2015-07-20.97108 UT with unfiltered magnitude limit 19.4m. There is no any source in VIZIER(and POSS with ~22m limit), so we suggest the dwarf nova outburst with amplitude more then 3.9m .
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/182913.50310624.2.png

MASTER OT J000250.69+102403.3 discovery - possible dwarf nova outburst with Ampl>4.4m

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 00h 02m 50.69s +10d 24m 03.3s on 2015-11-10.907 UT.
The OT unfiltered magnitude is 18.6m (limit 19.8m).
The OT is seen in 4 images on 10Nov. There are 3 images with m_OT=18.6 2015-11-11 19:26:40/21:40:31UT. We have reference image without OT on 2015-09-17.05250 UT with unfiltered magnitude limit 20.4m.
There is no any source in VIZIER database, that means the 22m lim of POSS and ~23m on single Sloan survey images. So we suggest the dwarf nova outburst with amplitude more than 4.4m .
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/000250.69102403.3.png

Current outburst of MASTER OT J051054.52+181042.9 ATEL #5688:
datetime mag
2015-11-06 02:53:53.117 15.6
2015-11-06 03:04:44.725 15.5
2015-11-06 03:15:50.662 15.5
2015-11-06 03:18:15.111 15.5
2015-11-06 03:21:44.257 15.7
2015-11-06 03:32:40.424 15.9

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net