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MASTER-SAAO: 4 new Dwarf Novae

ATel #7314; O. Gress(ISU), P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, V. Vladimirov, A. Kuznetsov, E. Popova, V. Shumkov, S. Shurpakov (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University)
on 30 Mar 2015; 17:48 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J102039.45-810556.9 discovery - new Dwarf Nova

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 10h 20m 39.45s -81d 05m 56.9s on 2015-03-29.90221 UT.
The OT unfiltered magnitude is 15.7m (the limit is 19.0m). There are 3 images with OT this night. We have reference image without OT on 2015-01-02.98139 UT with 18.8 unfiltered magnitude limit.

There is no any source in VIZIER database, NSVS and CRTS surveys.

Spectral observations for this possible Dwarf Nova are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/102039.45-810556.9.png

MASTER OT J075412.72-741641.3 - new Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 54m 12.72s -74d 16m 41.3s on 2015-03-29.87199 UT.
The OT unfiltered magnitude is 17.4m (the limit is 19.2m). The OT is seen in 4 images.
We have reference image without OT on 2014-12-31.96208 UT with 19.5 unfiltered magnitude limit, on 2015-02-28 with m_lim=19.1, 2015-01-15 with m_lim=19.5, 2015-01-08 with m_lim=18.2, on 2015-01-02 with m_lim=19.2.

There is no any source inside 5" in VIZIER database, no sources in NSVS and CRTS survey.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/075412.72-741641.3.png

MASTER Ot J135548.61-465107.2 discovery - new Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 55m 48.61s -46d 51m 07.2s on 2015-03-29.92229 UT.
The OT unfiltered magnitude is 18.2m (the limit is 19.1m). The OT is seen in 3 images. We have reference image without OT on 2014-12-25.06738 UT with 19.3 unfiltered magnitude limit. We have images without OT on 2014-12-25.067 with m_lim=19.3, on 2015-01-17.091UT with m_lim=19.2.

There is S968081516 GSC2.3 source with only Bj=21.64.

The discovery and reference images of this Dwarf Nova are available at: http://master.sai.msu.ru/static/OT/135548.61-465107.2.png

MASTER OT J134121.78-445711.0 - new Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 41m 21.78s -44d 57m 11.0s on 2015-03-29.98291 UT.
The OT unfiltered magnitude is 18.6m (the limit is 19.7m).
The OT is seen on 7 images on 29 Mar, and on 2 images on 2015-03-28.877UT and 2015-03-28.893 with m_OT=18.4 .
We have reference images without OT on 2014-12-23.07678 UT with unfiltered magnitude limit 19.3m, on 2015-02-28 with m_lim=19.5, on 2015-01-17 with m_lim=19.3
There is no any known source inside 5" in VIZIER database, NSVS and CRTS surveys.

Spectral observations are required.
The discovery and reference images are available at:http://master.sai.msu.ru/static/OT/134121.78-445711.0.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net