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MASTER-IAC: bright dwarf nova outburst

ATel #8855; P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez, M. Serra Ricart, G. Israelyan (The Instituto de Astrofísica de Canarias), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, D. Vlasenko, I. Gorbunov, D. Kuvshinov (Lomonosov Moscow State University, SAI)
on 22 Mar 2016; 21:34 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J193808.47+543155.7 discovery - dwarf nova outburst, ampl>3.2m

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 19h 38m 08.47s +54d 31m 55.7s on 2016-03-20.19655 UT.
The OT unfiltered magnitude is 16.2m (limit 18.9m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2015-09-23.93564 UT with unfiltered magnitude limit 18.8m.
There is GALEX source in 1.7" (and USNO-B1 star with possible PM in 2.5 " with B2=19.67 and R2=19.29) so we suggest outburst's ampl>3.2m (MASTER unfiltered magnitude is calibrated to USNO-B1 w=0.2B+0.8R)
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/193808.47543155.7.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net