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MASTER: 3 dwarf novae

ATel #7237; O. Gress (ISU), P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, SAI), 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), S. Shurpakov, V. Shumkov (MASTER-team)
on 17 Mar 2015; 11:30 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J172631.48-614041.0 discovery - Dwarf Nova

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 26m 31.48s -61d 40m 41.0s on 2015-03-16.07646 UT.
The OT unfiltered magnitude is 17.6m (the limit is 19.4m). The OT is seen on 3 images. There are 8 images with OT at the next night 2015-03-16.997 with m_OT=18.0. There is no any source inside 5" in VIZIER database.
We have reference images without OT on 2015-01-31.06784UT with 19.9 unfiltered magnitude limit and on 2015-02-03.0789 with 19.4 upper limit in MASTER-SAAO database.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/172631.48-614041.0.png
Spectral observations are required.

MASTER OT J165542.72-650357.8 discovery - Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 16h 55m 42.72s -65d 03m 57.8s on 2015-03-16.09824 UT.
The OT unfiltered magnitude is 17.4m (the limit is 19.3m). There is no any source inside 5" in VIZIER database.
The OT is seen in 3 images. There is no minor planet at this place.
We have reference images without OT on 2015-01-31.04253 UT with 19.5m unfiltered magnitude limit, on 2015-02-02.9856UT with 19.4m lim, on 2015-01-11.107UT with 18.1m lim.
The discovery and reference images are available at:http://master.sai.msu.ru/static/OT/165542.72-650357.8.png
Spectral observations are required.

MASTER OT J120251.56-454116.7 discovery - Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 02m 51.56s -45d 41m 16.7s on 2015-03-15.03699 UT with m_OT=16.0(the limit is 19.5m). There are images with OT on 2015-03-16.887 with m_OT=17.5. There is marginally seen OT with m_OT=19.5 on 2015-02-16.054UT in MASTER-SAAO database.
We have reference image without OT on 2015-10-01.998UT with unfiltered magnitude limit 18.6m.
This OT is identified with 0443-0273976 USNO-B1 star with R=19.49 and B=19.51.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/120251.56-454116.7.png
Spectral observations are required.

MASTER OT J045335.80-465501.2 discovery

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 04h 53m 35.80s -46d 55m 01.2s on 2015-03-15.83362UT with unfiltered m_OT=19.0m (the limit is 20.7m).
The OT is seen in 4 images. There is unfiltered m_OT=19.5 on 2015-03-16.921UT, and marginally m_OT=19.8 on 2015-03-10.830UT.
There is a USNO-B1 star with B2=21.78, R2=20.94 in 3.5". There is WISE source in 8" (J045334.97-465501.1).
We have reference images without OT on 2014-12-24.95737 UT with 20.4 unfiltered magnitude limit, on 2015-02-09 with 20.1m lim, on 2015-02-08 with 19.9m lim, on 2015-01-12 with 20.2m lim.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/045335.80-465501.2.png

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net