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MASTER Net: close binary systems and eruptive variables

ATel #10516; P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Rebolo, M. Serra-Ricart (IAC), R. Podesta (OAFA), H. Levato (ICATE), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, V. Kornilov, T. Pogrosheva, O. Gress, V. Shumkov, V. Vladimirov, V. Chazov, I. Gorbunov (Lomonosov MSU), C. Saffe(ICATE), F. Podesta (OAFA), A. Gabovich (BSPU)
on 21 Jun 2017; 19:08 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

Pavel MASTER OT J203248.71-295522.0 detection - CV, ampl>2.6m
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 20h 32m 48.71s -29d 55m 22.0s on 2017-06-19.20638 UT.
The OT unfiltered magnitude is 17.1m (mlim=19.8m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2016-09-19.06015 UT with 19.7 unfiltered magnitude limit, so the ampl of current outburst is more then 2.6m. There is USNO-B1 star with the same parameters.
Spectral observations are required
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/203248.71-295522.0.png

MASTER OT J233652.06+130550.8 detection - CV with ampl>4.9m or QSO flare
MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 23h 36m 52.06s +13d 05m 50.8s on 2017-06-20.20566 UT.
The OT unfiltered magnitude is 17.1m (limit 19.4m).
The OT is seen in 3 images^
We have reference image without OT on2014-09-19 19:26:08 UT with unfiltered magnitude limit 20.3m (MASTER-Kislovodsk).
There is GALEX source. There is SDSS source with rmag=21.99. It is also marked as candidate to QSO in and SDSS DR10 catalogue of candidate quasars (Brescia+, 2015)
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/233652.06130550.8.png

MASTER OT J200232.78-205500.8 detection - blue OT (CV?) with ampl>4m

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 20h 02m 32.78s -20d 55m 00.8s on 2017-06-19 00:58:01.515 UT.
The OT unfiltered magnitude is 18.0m (limit 19.5m).
The OT is seen in 3 images:
2017-06-19 00:42:37.246 18.8
2017-06-19 00:46:08.041 18.3
2017-06-19 00:58:01.515 18.0
We have reference image without OT on 2016-08-27.95421 UT with unfiltered magnitude limit 19.6m. There is GSC2.3 blue star with previous outbursts in 1977.552 y (jmag=21.84) and in 1966.0(USNO-B1 only B2=21.13)
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/200232.78-205500.8.png

MASTER OT J132548.18-031429.2 detection - UVCet type flare
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 25m 48.18s -03d 14m 29.2s on 2017-06-16.83683 UT. The OT is seen in 2 images of 3 one:
2017-06-16 19:42:44 no OT up to mlim=20.0
2017-06-16 20:05:02.459 19.6 (mlim=20.2)
2017-06-16 20:19:32.513 19.9 (mlim=20.4)
We have reference image on 2016-07-06.80887 UT with unfiltered mlim= 21.3m.
There is red star (SDSS r=20.868, USNO-B1 upper limit 22m)
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/132548.18-031429.2.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net