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MASTER Net: 3 dwarf nova outbursts

ATel #8522; O. Gress, E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), N. Budnev (API ISU), N. Tiurina, V. Kornilov, V. Shumkov, A. Kuznetsov, P. Balanutsa, I. Gorbunov, D. Vlasenko, V. Vladimirov (M. V.Lomonosov Moscow State University, SAI), K. Ivanov (Applied Physics Institute, Irkutsk State University), S. Potter, M. Kotze (The South African Astronomical Observatory), V. Yurkov, A. Gabovich (Blagoveschensk Pedagogical State University)
on 9 Jan 2016; 15:58 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER044914.02+464511.9 discovery - dwarf nova outburst, Ampl>4.6mag, no known source in VIZIER
MASTER-Tunka auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 04h 49m 14.02s +46d 45m 11.9s on 2016-01-06.76115 UT.
The OT unfiltered magnitude is 17.4m (limit 19.7m).
The OT is seen in 3 images. There is no minor planet at this place.There is no known source in VIZIER database, but there is very faint non-identified source at POSS images, with the same brightness both in B and in R ~22m. So we suggest the dwarf nova outburst with Ampl>4.6m
We have reference image without OT on 2015-04-15.64911 UT with magnitude limit in 'C' filter 19.0m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/044914.02464511.9.png

MASTER OT J164950.45-655405.0 discovery - dwarf nova outburst with ampl>4.8m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 16h 49m 50.45s -65d 54m 05.0s on 2016-01-05.08053 UT.
The OT unfiltered magnitude is 17.2m (limit 19.2m).
The OT is seen in 7 images. There is no minor planet at this place.There is no any source in VIZIER at this place.
We have reference image without OT on 2015-08-11.81249 UT with unfiltered magnitude limit 19.5m.

MASTER-SAAO has one image of
previous outburst on 2015-01-11 02:37:52.622UT with m_OT=16.5. There is no any sources on 2015-10-22 19:08:15 with m_lim=18.6, on 2015-08-11 19:29:59 with m_lim=19.5, on 2015-04-13 00:36:33 with m_lim=19.4, on 2015-01-31 01:01:15 UT with m_lim=19.5. So we suggest the dwarf nova outburst with m_lim>4.8m (taking into account the POSS limits and no previous detection of any survey).

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/164950.45-655405.0.png

MASTER OT J003836.48+393953.5 - dwarf nova outburst(17.4m) of SDSS star(rmag=22.5)

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 00h 38m 36.48s +39d 39m 53.5s on 2016-01-04.46045 UT.
The OT unfiltered magnitude is 17.4m (the limit is 19.3m).

The OT is seen in 6 images. There is no minor planet at this place.

We have reference image without OT on 2011-10-25.70042 UT with unfiltered magnitude limit 19.9m.

There is SDSS9 J003836.70+393953.4 star with 1.2 arcsec offset with R=22.493. So we suggest the dwarf nova outburst with ampl>5m

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/003836.48393953.5.png

MASTER Global Robotic Net