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MASTER: possible SN and DN.

ATel #7263; O. Gress (ISU), V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, P. Balanutsa, A. Kuznetsov, V. Chazov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, Sternberg Aastronomical 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), S. Shurpakov, V. Shumkov (MASTER-team)
on 20 Mar 2015; 21:18 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Supernovae, Transient, Variables

MASTER OT J111224.35-321250.1 discovery - possible SN in PGCPGC3081825

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 11h 12m 24.35s -32d 12m 50.1s on 2015-03-19.97348 UT.
The OT unfiltered magnitude is 18.9m (the limit is 20.2m).

There are 3 images witt OT in MASTER-SAAO database on 2015-03-19. We have reference image without OT on 2015-01-12.95617 UT with 19.6 unfiltered magnitude limit.

This possible SN is in 19.8"E and 14.6"N of the center of PGC3081825 galaxy (S0, v=10053km/s, Bmag=16.4).

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/111224.35-321250.1.png
Spectral observations are required.

MASTER OT J175909.56-584553.0 discovery - new Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 17h 59m 09.56s -58d 45m 53.0s on 2015-03-20.04155 UT.
The OT unfiltered magnitude is 15.8m (the limit is 19.8m).

The OT is seen in 4 images. There is no minor planet at this place.

We have reference image without OT on 2015-01-25.10803 UT with 19.0 unfiltered magnitude limit.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/175909.56-584553.0.png

There is 0312-0689648 USNO-B star with Rmag=17.4-18.3, I=17.67, B=17.49(-18.7 by GSC2.2).

Spectral observations are required.

List of Optical Transients discovered by MASTER

Global MASTER Robotic Net