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MASTER-SAAO: SN in PGC774805 and 3 Dwarf Novae

ATel #7307; E. Popova, O. Gress, P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Vladimirov, V. Kornilov, A. Kuznetsov, V. Chazov, S. Shurpakov, V. Shumkov (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)
on 28 Mar 2015; 22:33 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J132129.01-281240.7 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) = 13h 21m 29.01s -28d 12m 40.7s on 2015-03-25.84862 UT.
The OT unfiltered magnitude is 18.1m (limit 19.4m). There are 3 images with OT.

We have reference images without OT on 2015-02-17.98582 UT with 20.4 unfiltered magnitude limit; images on 2015-01-11.049 with 19m limit, and on 2015-01-19.050UT with 20.1 limit.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/132129.01-281240.7_2.png

This MASTER OT can be identified with S6LX003687 GSC2.3.2 star with only j_mag=21.8. There are no flares in Catalina and NSVS surveys. So this OT is a possible Dwarf Nova.
Spectral observations are required.

MASTER OT J095702.14-690235.7 discovery - new Dwarf Nova (2 flares)

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 09h 57m 02.14s -69d 02m 35.7s on 2015-03-27.83288 UT.
The OT unfiltered magnitude is 16.5m (limit 19.2m).

There are 3 images with OT (m_OT=16.5) on 27 Feb, and 2 images with OT on 2015-02-25.951UT with m_OT=19.5.

We have reference images without OT on 2015-02-25.95134 UT with 20.3 unfiltered magnitude limit, on 2015-01-19 00:26:50UT with m_lim=19.5m, 2015-01-06 00:41:22UT with m_lim=18.6, 2015-01-01 with m_lim=19.3.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/095702.14-690235.7.png

There is IGSL3 star with Rmag=20.53 and B=20.04 , identified with this MASTER OT, and USNO-B star with B2=16.69. So this is new Dwarf Nova's flare.
Spectral observations are required.

MASTER OT J060117.49-254844.2 discovery - SuperNova in PGC774805

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 06h 01m 17.49s -25d 48m 44.2s on 2015-03-28.81465 UT in 7.5"E and 8.1"S of PGC774805.
The PSN unfiltered magnitude is 18.2m (the limit is 19.4m). There are 3 images with PSN in MASTER-SAAO database.
We have reference image without OT on 2015-01-11.99618 UT with unfiltered magnitude limit 19.6m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/060117.49-254844.2.png
Spectral observations are required.

MASTER OT J122733.54-441427.7 discovery - possible new Dwarf Nova

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 27m 33.54s -44d 14m 27.7s on 2015-03-28.88951 UT.
The OT unfiltered magnitude is 18.5m (the limit is 19.6m). The OT is seen in 3 images.We have 1 image with OT on 2015-02-01.883 with m_OT=18.6 . There is no any source inside 5" in VIZIER database.

There are reference images without OT in MASTER-SAAO database: on 2015-03-06 with m_lim=19m, 2015-01-25.04973 UT with unfiltered magnitude limit 20.0m, 2015-01-11.026 with m_lim=19.3m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/122733.54-441427.7.png
Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net