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MASTER: Dwarf Novae and SN

ATel #7294; 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 26 Mar 2015; 15:02 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J192513.88-521137.6 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) = 19h 25m 13.88s -52d 11m 37.6s on 2015-03-24.05163 UT.
The OT unfiltered magnitude is 15.7m (the limit is 19.7m).

There are 23 images with OT. We have reference image without OT on 2015-02-15.11241 UT with 19.2 unfiltered magnitude limit.

This OT is identical to 0378-1027535 Usno-B star with B2=19.00, R2=18.99.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/192513.88-521137.6.png

Spectral observations are required.

MASTER OT J203529.80+063652.8 discovery - new Dwarf Nova

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 20h 35m 29.80s +06d 36m 52.8s on 2015-03-25.06265 UT.
The OT unfiltered magnitude is 17.1m (limit 19.4m).

There are 6 images with OT. We have reference image without OT on 2012-06-21.97900 UT with 20.2 unfiltered magnitude limit in MASTER-Kislovodsk database.

This OT is identical to 0966-0560307 Usno-B star with B2=20.76, and GSC V=19.2.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/203529.80063652.8.png
Spectral observations are required.

MASTER OT J204313.96-321110.3 discovery - possible SuperNova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 20h 43m 13.96s -32d 11m 10.3s on 2015-03-25.09162 UT.
The OT unfiltered magnitude is 16.8m (the limit is 19.4m).

There are 7 images with OT in MASTER-SAAO database. We have reference image without OT on 2015-03-07.14464 UT with 18.6 unfiltered magnitude limit.

This possible Supernova is in 1.7"W and 4.4"S from the center of 2MASX J20431406-3211099 galaxy.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/204313.96-321110.3.png

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net