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MASTER-SAAO: 2 Dwarf Novae discovery

ATel #7337; O. Gress (ISU), V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov, E. Popova, V. Shumkov, S. Shurpakov (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 2 Apr 2015; 14:49 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J204503.09-440502.3 discovery - new Dwarf Nova flare

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 20h 45m 03.09s -44d 05m 02.3s on 2015-04-01.04984 UT.

The OT unfiltered magnitude is 17.7m (the limit is 18.8m). There are 6 images with OT in MASTER-SAAO database on 2015-04-01, and m_OT=17.3 on 2015-04-02.161UT. We have reference image without OT on 2015-03-03.13341 UT with 19.7 unfiltered magnitude limit.

This OT is identical to 0459-0742770 USNO-B1 source with B2=20.41, R2=23.42. There is no sources in NSVS, CRTS. => DN.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/204503.09-440502.3.png

Spectral observations are required.

MASTER OT J204243.79-461439.9 discovery - new Dwarf Nova flare

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 20h 42m 43.79s -46d 14m 39.9s on 2015-04-01.04644 UT. The OT unfiltered magnitude is 17.1m (limit 18.7m). There are 7 images with OT. We have reference image without OT on 2015-03-03.13086 UT with 19.3 unfiltered magnitude limit.

This OT can be identified with 0437-0755065 USNO-B1 star with B2=19.66, R2=20.21. =>DN

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/204243.79-461439.9.png

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net