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MASTER-SAAO and MASTER-Tunka optical transients.

ATel #7032; O. Gress (ISU), V. Lipunov, E. Gorbovskoy (Lomonosov MSU, SAI), D. Buckley (SAAO), S. Antipin, D. Denisenko, V. Kornilov, N. Tiurina, V. Chazov, A. Kuznetsov (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (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), V. Shumkov, S. Shurpakov (MASTER team members)
on 6 Feb 2015; 16:47 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Transient, Variables

MASTER OT J122126.39-311248.3 – variable star, possible E

MASTER-SAAO auto-detection system ( Lipunov et al., 2010 ) discovered OT source at (RA, Dec) = 12h 21m 26.39s -31d 12m 48.3s on 2015-02-03.0226UT .

The OT unfiltered magnitude is 17.4m ( the limit is 19.3m).

There are 20 images on 2015-02-03 and 2015-02-06 with OT. There is reference image at MASTER-SAAO database with a 19.4m star on 2015-01-16.98490 UT with 19.4m unfiltered magnitude limit .

This OT is identical to the USNO-B1 0587-0282139 star with R2=19.68m , B2=19.78, I=18.66 .

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTERJ122126.39-311248.3.jpg

Spectral observations are required.

MASTER175847.37+253624.2 - new CV, UV Cet type

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 17h 58m 47.37s +25d 36m 24.2s on 2015-01-30.911 UT. The OT unfiltered magnitude is 16.7m (the limit is 19.1m).

OT photometry is the following:

2015-01-30.911 16.7

2015-01-30. 914 16.3

2015-01-30.920 17.9 We have reference image without OT on 2011-06-28.73624 UT with 19.6m unfiltered magnitude limit and 2015-01-30.901 with 19.6 unfiltered magnitude limit.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTERJ175847.37+253624.2.jpg

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net