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MASTER-SAAO, MASTER-OAFA: optical transients

ATel #9950; V. Shumkov, O. Gress, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Podesta(OAFA), H. Levato (ICATE), C. Lopez, F. Podesta (OAFA),C. Saffe(ICATE), N. Tiurina, E. Gorbovskoy, V. Kornilov, A. Kuznetsov, V. Vladimirov, V. Chazov(Lomonosov MSU), S. Potter (SAAO), A. Gabovich (BSPU), A. Krylov, I. Gorbunov, T. Pogrosheva (Lomonosov MSU)
on 8 Jan 2017; 00:32 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J154313.55-712056.3 discovery - new OT, possibly dwarf nova, Ampl>4.9m, no known VIZIER data

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 15h 43m 13.55s -71d 20m 56.3s on 2017-01-05.00719 UT.
The OT unfiltered magnitude is 17.1m (mlim=18.6).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image on 2015-06-22.76253 UT with unfiltered mlim= 19.5m, on 2016-12-27 01:50:18UT with mlim=18.8 (unfiltered)
There is no known sources in VIZIER database, it means more then 4.9mag amplitude of current outburst
Spectral observations are required.
The discovery and reference images are available at: "> http://master.sai.msu.ru/static/OT/154313.55-712056.3.png"> http://master.sai.msu.ru/static/OT/154313.55-712056.3.png

MASTER OT J152615.50-424755.1 discovery - dwarf nova outburst, Ampl>4m

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 15h 26m 15.50s -42d 47m 55.1s on 2017-01-04.34449 UT.
The OT unfiltered magnitude is 16.7m (limit 17.6m).
This OT is seen on 4 images on 04 Jan, and on 3 images on 05 Jan (m_OT=16.5). There is no any sources at MASTER-SAAO reference images on 2016-12-31 02:25:24UT with mlim=18.3, on 2016-06-29 19:09:08UT with mlim=20.0, on 2016-03-10 01:38:16UT with mlim=20.7 .
We have previous outburst on 2016-01-18 01:15:36.712UT in MASTER-SAAO database with m_OT=16.6 (3 images).
There is USNO-B1 blue star (also previous outburst) at POSS images.

Spectral observations are required.
The discovery and reference images are http://master.sai.msu.ru/static/OT/152615.50-424755.1.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net