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MASTER: high amplitude OT

ATel #10564; P. Balanutsa, T. Pogrosheva, V. Shumkov, V. Lipunov (Lomonosov MSU), D. Buckley, J. Stoffels (SAAO) R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, 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 8 Jul 2017; 10:38 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J174342.12-553006.3 discovery - 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) = 17h 43m 42.12s -55d 30m 06.3s on 2017-07-03.05624 UT.
The OT unfiltered magnitude is 16.5m (mlim=18.2m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2017-04-28.20652 UT with unfiltere magnitude limit 18.8m.
There is only GSC2.3 blue star and Gaia, it means 22m in history limit and more then 5.5m of current outurst amplitude
Spectral observations are required.
The discovery and reference images are
http://observ.pereplet.ru/MASTEROTJ174342.12-553006.3.png

MASTER OT J185910.46-235548.6 discovery - dwarf nova? with ampl>6.5m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h 59m 10.46s -23d 55m 48.6s on 2017-07-05.07468 UT.
The OT unfiltered magnitude is 15.2m (mlim=17.8).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2015-08-15.75181 UT with unfiltered mlim= 19.1m.
There is USNO-B1 star with only blue B1=20.38, B2=19.76, it menas R1,2<22m (MASTER W=0.2B+0.8R) and more then 6.5m of current outburst amplitude.
Spectral observations are required.
The discovery and reference images are available at:
http://observ.pereplet.ru/MASTEROTJ185910.46-235548.6.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net