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MASTER-Kislovodsk: bright OT with 7mag amplitude

ATel #8730; O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), N. Samus (INASAN, Lomonosov MSU), N. Tiurina, P. Balanutsa, V. Vladimirov, A. Kuznetsov, V. Kornilov, V. Shumkov, I. Gorbunov, D. Vlasenko, D. Kuvshinov (Lomonosov Moscow State University, SAI), , A. Tlatov, V. Senik, D. Dormidontov, A. Parkhomenko(Kislovodsk Solar Station, Main Pulkovo observatory)
on 25 Feb 2016; 08:23 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J073325.52+373744.9 discovery - outburst with Ampl>7m, Nova or dwarf nova?

MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010 )discovered OT source at (RA, Dec) = 07h 33m 25.52s +37d 37m 44.9s on 2016-02-24.90468 UT.

The OT unfiltered magnitude is

15.1m

(limit 18.0m).The OT is seen in 3 images. There is no minor planet at this place.

We have the following reference images without OT:
2015-11-20 20:16:45 19.6 (MASTER-Tunka)
2015-09-24 20:24:29 19.1 (MASTER-Tunka)
2015-02-18 14:46:28 19.5 (MASTER-Tunka)
2014-10-26 01:46:21 20.4 (MASTER-Kislovodsk)
2013-11-27 19:22:56 19.5 (MASTER-Tunka)
2012-01-27 17:01:13 20.2 (MASTER-Tunka)
2011-11-05 20:39:29 20.3 (MASTER-Tunka)
2011-01-25 14:17:22 20.1 (MASTER-Tunka)
2011-10-28 02:23:13 20.3 (MASTER-Kislovodsk)

There is SDSS star in 0.5" with u=22.1(=-0.3),g=21.9(+-0.1),r=22.1(=-0.2),i=22.5, so we suggest the dwarf nova outburt with Ampl>7m.

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ073325.52373744.9.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net