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MASTER-Net: 2 optical transients

ATel #7505; P. Balanutsa, V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, V. Chazov, A. Kuznetsov (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, O. Gress, S. Yazev, V. Poleshchuk (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University), V. Shumkov, S. Shurpakov (MASTER-Team)
on 14 May 2015; 09:22 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J174008.23+374114.0 discovery - PSN in 19.8"E,7.3"N from CGCG 1738.4+3742 galaxy or Dwarf Nova (Ampl>3m)

MASTER-Tunka auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 40m 08.23s +37d 41m 14.0s on 2015-05-13.74831 UT in 19.8"E and 7.3"N from the center of CGCG 1738.4+3742 galaxy (possible SuperNova?).

The OT unfiltered magnitude is 17.7m (the limit is 20.5m). There are 3 images with this possible SuperNova (NED: host galaxy Vhel=15351km/s, visual m_gal=15.07).

We have reference images without OT on 2011-03-12.888UT with 20.2 unfiltered magnitude limit in MASTER-Tunka database, on 2012-08-23.782UT with m_lim=20.5 and on 2011-05-27.983UT with m_lim=20.5 in MASTER-Kislovodsk database.

We have an image with m_OT~20 on 2013-06-09.677UT (m_lim=19.6, MASTER-Tunka), so this MASTER OT can be a dwarf nova outburst now with Ampl>3m.

Spectral observations are required.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ174008.23+374114.0.jpg

MASTER OT J124431.93-395236.2 discovery - Dwarf Nova flare, Ampl>4m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 44m 31.93s -39d 52m 36.2s on 2015-05-12.89648 UT. The OT unfiltered magnitude is 17.6m (limit 20.4m).

There are 3 images with OT. We have reference image without OT on 2015-03-15.05149 UT with 19.8 unfiltered magnitude limit.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/124431.93-395236.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net