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MASTER-OAFA: bright dwarf nova outburst

ATel #10286; V. Shumkov, A. Malkova, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), D. Buckley(SAAO), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, T. Pogrosheva, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress, I. Gorbunov, A. Krylov (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), A. Gabovich (BSPU)
on 19 Apr 2017; 09:21 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J105824.56-351922.9 discovery - dwarf nova outburst, 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) = 10h 58m 24.56s -35d 19m 22.9s on 2017-04-19.09413 UT.
The OT unfiltered magnitude is 16.7m (mlim=19.8m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2017-03-05 21:35:42UT with mlim=19.6 (MASTER-SAAO), on 2016-10-28.35589 UT with 18.9 unfiltered magnitude limit(MASTER-OAFA).
There is GSC2.3.2 star in 0.4" with only blue j=22.16m, it means more then 5.5m of current outburst amplitude.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/105824.56-351922.9.png

MASTER OT J065752.08-632622.6 detection - possib.dwarf nova outburst, ampl>2.2m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) detected OT source at (RA, Dec) = 06h 57m 52.08s -63d 26m 22.6s on 2017-03-30.82825 UT.
The OT unfiltered magnitude is 19.8m (mlim=21.0).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image on 2014-12-21.95277 UT with unfiltered mlim=20.6m.
There is GSC2.3.2 star in 0.9" with known only blue jmag=21.58, it means 22mag POSS limit in history and more then 2.2mag of current outburst amplitude (MASTER W=0.2B+0.8R calibrated by USNO-B1)
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/065752.08-632622.6.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net