MASTER: 2 flares at the SDSS galaxy

ATel #7297; V. Vladimirov, V. M.Lipunov, E. S.Gorbovskoy, S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, D. Kuvshinov, E. Popova (Lomonosov Moscow State University, SAI), D. Buckley, 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), S. Shurpakov, V. Shumkov (MASTER-team)
on 26 Mar 2015; 22:51 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J113003.04+280647.6 discovery - 2 flares in the SDSS (galaxy?)

MASTER-Kislovodsk auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 11h 30m 03.04s +28d 06m 47.6s on 2015-03-25.80142 UT.

The OT unfiltered magnitude is 18.4m (the limit is 19.4m). The OT is seen in 4 images. There is no minor planet at this place.

We have about 200 reference images without OT up to 19-21.5 in MASTER-Kislovodsk, Tunka and Amur databases from 2009 to 2015, for ex. on 2012-03-19.91296 UT with 20.2 unfiltered magnitude limit.

There is J113003.05+280647.7 SDSS galaxy(Rel.7, Rel.9) with g=22.526 and r=22.073. And in this case our OT is superluminous SN. But.

But we have 2 images in MASTER-Kislovodsk database on 2010-11-21 01:37:20.261 and 2010-11-21 02:23:12.639 with this OT, m_OT=17.7 . So this SDSS galaxy should be a star and OT should be a Dwarf Nova flare (UG).

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/113003.04280647.6.png

Global MASTER Robotic Net