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MASTER: 4 OT of different nature

ATel #7191; V. Shumkov, P. Balanutsa, S. Shurpakov, V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO)N. Tiurina, S. Antipin, 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 9 Mar 2015; 13:37 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J202246.23+074636.3 discovery - 7 magnitude amplitude flare: superluminous supernova or high amplitude CV

MASTER-Kislovodsk auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 20h 22m 46.23s +07d 46m 36.3s on 2015-03-09.09259 UT.

The OT unfiltered magnitude is 16.0m (the limit is 17.8m).

The OT is seen in 3 images. There is no minor planet at this place.

We have reference image without OT on 2014-11-20.63487 UT with 20.5 unfiltered magnitude limit, and 30 images during 2014-2010 up to 20m.

This OT is identified with J202246.26+074636.4 Sloan source, classified as Galaxy, with Rmag=22.173. In this case MASTER OT J202246.23+074636.3 is a superluminous supernova. But this Sloan source can be not galaxy, and in this case MASTER OT is a very high amplitude CV (7m).

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/202246.23074636.3.png

Spectral observations are required.

MASTER OT J145936.51-714660.0 - fast optical transient

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 14h 59m 36.51s -71d 46m 60.0s on 2015-03-08.85120 UT.

The OT unfiltered magnitude is 16.6m (the limit is 19.0m).

There are 17 images with OT on 2015-03-08.
There are 8 images without OT with 18.9 unfiltered limit on 2015-03-02.
There is OT with unfiltered m_OT=16.5 on 3 images on 2014-12-25.0448 UT(25.0494UT, 25.0539UT).
There are 6 images without OT on 2014-12-17 with 19.0 unfiltered magnitude limit.

The discovery and reference images are available at:http://master.sai.msu.ru/static/OT/145936.51-714660.0.png

Spectral observations are required.

MASTER OT J073110.47-462722.5 discovery - new CV

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 31m 10.47s -46d 27m 22.5s on 2015-03-06.86260 UT.

The OT unfiltered magnitude is 18.7m (limit 18.8m).

There are 2 images with OT. There is no minor planet at this place. There no any source inside 5" in VIZIER database.

We have reference image without OT on 2015-01-11.98370 UT with 19.5 unfiltered magnitude limit.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTERJ073110.47-462722.5

MASTER OT J162719.40-643245.9 - new CV

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 16h 27m 19.40s -64d 32m 45.9s on 2015-03-08.98890 UT. The OT unfiltered magnitude is 17.0m (the limit is 18.5m).

There are 3 images of OT with m=18.5 on 2015-03-03.959UT.

There is reference image without OT on 2015-01-11.08624 UT with unfiltered magnitude limit 18.9m.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/162719.40-643245.9.png

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net