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MASTER: 2 new Dwarf Novae.

ATel #7188; V. Shumkov, N. Tiurina, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, P. Balanutsa, V. Kornilov, A. Kuznetsov, S. Shurpakov, V. Chazov, V. Vladimirov, D. Kuvshinov (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), O. Gress, 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 8 Mar 2015; 21:26 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J175351.23-641739.9 - possible 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) = 17h 53m 51.23s -64d 17m 39.9s on 2015-03-06.96394 UT.

The OT unfiltered magnitude is 15.7m (thr limit is 18.3m).

There 3 images with OT on this night. There is no minor planet at this place.

There is reference image without OT on 2015-01-24.07389 UT with 19.2 unfiltered magnitude limit in MASTER-SAAO database.

This OT is identical to S7EU053639 source of The Guide Star Catalog (STScI, 2006) with B=20.78.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/175351.23-641739.9.png

Spectral observations are required.

MASTER OT J145732.52-722144.7 - possible new Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 14h 57m 32.52s -72d 21m 44.7s on 2015-03-02.94076 UT.

The OT unfiltered magnitude is 16.7m (the limit is 18.2m).

There are 8 images with OT at 2015-03-02. There is no any object now 2015-03-08.853 UT up to 19.0m.

We have reference image without OT on 2014-12-17.96845 UT with unfiltered magnitude limit 19.1m.

The discovery and reference images are available at:http://master.sai.msu.ru/static/OT/145732.52-722144.7.png

List of Optical Transients discovered by MASTER

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Global MASTER Robotic Net