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MASTER-OAFA detection: QSO or CV

ATel #10790; V. Shumkov, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), D. Buckley (SAAO), E. Gorbovskoy, O. Gress, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress, I. Gorbunov, A. Krylov, T. Pogrosheva, (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio)
on 28 Sep 2017; 09:17 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Request for Observations, AGN, Quasar, Transient, Variables

MASTER OT J205110.36+044842.2 discovery - QSO or dwarf nova, ampl>5.5m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 20h 51m 10.36s +04d 48m 42.2s on 2017-09-28.15049 UT.
The OT unfiltered magnitude is 15.0m (mlim=18.7m).
The OT is seen in 8 images. There is no minor planet at this place.
There is SDSS possibly QSO in 0.137" and GALEX source in 1"
We have reference image without OT on 2017-09-17.22237 UT with unfiltered magnitude limit 19.2m in MASTER-OAFA, on 2016-08-26 20:21:56Ut with mlim=20.5 in MASTER-SAAO.
It means, the amplitude of current outburt is more then 5.5

Spectral observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/205110.36044842.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net