MASTER: optical transients different types

ATel #7226; V. Vladimirov, P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, V. Shumkov, S. Shurpakov, 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 15 Mar 2015; 06:24 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J162719.40-643245.9 discovery - possible Dwarf nova

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) 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 (limit 18.5m).
The OT is seen in 16 images. There is no minor planet at this place.
There are reference image without OT on 2015-01-11.08624 UT with unfiltered magnitude limit 18.9m, and there are images this night with marginally seen 19.4m OT (m_lim=19.4).
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/162719.40-643245.9_1.png
Spectral observations are required.

MASTER OT J091839.36-074215.1 discovery - possible UV Cet
MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 09h 18m 39.36s -07d 42m 15.1s on 2015-03-10.88312 UT. The OT unfiltered magnitude is 17.4m (limit 19.2m).
The OT is seen in 3 images with the fading from 15.5 to 19.0 in 50min. There is no minor planet at this place.
We have reference image without OT on 2010-11-04.10300 UT with 19.7 unfiltered magnitude limit.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/091839.36-074215.1.png
Spectral observations are required.

MASTER OT J095819.53-715457.3 discovery
(had to be the fifth OT from ATEL #7218 )

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 09h 58m 19.53s -71d 54m 57.3s on 2015-03-10.88492 UT.
The OT unfiltered magnitude is 18.1m (limit 19.6m).
There are images of OT during 3 nights in MASTER-SAAO database, preliminary photometry is the following:
Date,UT m_OT
2015-03-10.879 18.0
2015-03-11.876 17.3
2015-03-13.877 16.8
We have reference image without OT on 2015-01-01.01503 UT with unfiltered magnitude limit 19.4m.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/095819.53-715457.3.png
Spectral observations are required.

Global MASTER Robotic Net