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The 800th MASTER OT discovery: Dwarf Nova flare.

ATel #7449; V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, E. Popova, V. Vladimirov, V. Shumkov (Lomonosov Moscow State University, SAI), 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), S. Shurpakov (MASTER-Team)
on 26 Apr 2015; 21:17 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTEROT J201931.07-460044.6 discovery - Dwarf Nova flare

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered the 800-th MASTER OT source at (RA, Dec) = 20h 19m 31.07s -46d 00m 44.6s on 2015-04-26.08954 UT.

The OT unfiltered magnitude is 18.4m (the limit is 20.1m).

There are 4 images with OT, full time between first and last exposition is 40min, m_OT is the same.

We have reference images without OT on 2015-04-22.08853 UT with 20.8 unfiltered magnitude limit, on 2015-04-24.111 UT with m_lim=20.1 , on 2015-04-12.086 UT with m_lim=20.5.

There is no minor planet at this place. There is no sources in CRTS, the area was observed. There is a GSC2.3.2 star with bmag=22.22, rmag=20.78 (previous burst of this dwarf nova). No 2MASS source.
=> MASTER OT is Dwarf Nova flare with Ampl>3.0m

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/201931.07-460044.6.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net