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MASTER-OAFA discovery: dwarf nova outburst

ATel #9643; V. Shumkov, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), D. Buckley (SAAO), N. Tiurina, P. Balanutsa, A. Kuznetsov, E. Gorbovskoy, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress, K. Ivanov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), T. Pogrosheva
on 18 Oct 2016; 10:27 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient, Variables

MASTER OT J021951.96-692659.6 discovery - dwarf nova outburst, current ampl>4.8m

MASTER-OAFA (Argentina, San Juan National Univeristy's Observatorio Astronomico Felix Aguilar) auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 02h 19m 51.96s -69d 26m 59.6s on 2016-10-18.23277 UT.
The OT magnitude in unfiltered is 17.2m (limit 18.3m).
The OT is seen in 7 images (2016-10-18 04:54:01.004-07:06:00.005). There is no minor planet at this place.
We have reference image without OT on 2016-08-13.27069 UT with unfiltered mlim=19.8m. The nearest in time image is in MASTER-SAAO database on 2016-09-22 22:21:27UT with mlim=19.6
There is unfiltered m_OT=16.4 on 2016-01-27 22:35:59.842UT (3 images) in MASTER-SAAO database.
There is only GSC2.3.2 with fmag=20, it means 22m POSS limit and short(several days) outbursts duration (not red star).
Spectral observations are required.
The discovery and reference images are http://master.sai.msu.ru/static/OT/MASTEROTJ021951.96-692659.6.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net