MASTER-IAC: QSO or bright dwarf nova outburst
ATel #8359; O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo Lopez, M. Serra-Ricart, G. Israelyan, N. Lodieu ( Instituto de Astrofisica de Canarias), N. Tiurina, V. Kornilov, P. Balanutsa, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Vladimirov (M. V. Lomonosov Moscow State University, SAI)
on 3 Dec 2015; 20:16 UT
Credential Certification: Nataly Tyurina (firstname.lastname@example.org)
Subjects: Optical, Request for Observations, AGN, Cataclysmic Variable, Quasar, Transient, Variables
MASTER OT J075014.67+153229.5 discovery - dwarf Nova outburst with Ampl>4m or Sloan classification's QSO flare
MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net",
Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 07h 50m 14.67s +15d 32m 29.5s on 2015-12-03.15072 UT.
The OT unfiltered magnitude is 16.2m (the limit is 19.4m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2015-11-20.17037 UT with unfiltered magnitude limit 19.8m.
There is USNO-B1 source with Blue=(17.8-20.3)mag, Red=(17.9-19.4), also there is a QSO candidate from SDSS DR10 catalogue of candidate quasars. So there are 2 scenarios: dwarf nova outburst with amplitude more then 4mag, or QSO flare.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ075014.67153229.5.jpg
List of Optical Transients discovered by MASTER
MASTER Global Robotic Net