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MASTER-Net: optical transients

ATel #8728; P. Balanutsa, V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley(SAAO), N. Tiurina, V. Kornilov, O. Gress, A. Kuznetsov, V. Shumkov, I. Gorbunov, D. Vlasenko, D. Kuvshinov (Lomonosov Moscow State University, SAI), S. Potter, M. Kotze (The South African Astronomical Observatory), A. Tlatov, V. Senik, D. Dormidontov, A. Parkhomenko(Kislovodsk Solar Station, Main Pulkovo observatory)
on 24 Feb 2016; 22:49 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J045302.87-492128.4 discovery - dwarf nova outburst with ampl>3.3m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 04h 53m 02.87s -49d 21m 28.4s on 2016-02-22.89387 UT.
The OT unfiltered magnitude is 18.0m (the limit is 18.7m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2015-12-11.91999 UT with unfiltered magnitude limit 21.3m.
There is only GSC star with known blue mag 21.55, so we suggest the dwarf nova outburst with amplitude more then 3.3
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/045302.87-492128.4.png

MASTER OT J115319.96-321838.4 discovery - dwarf nova outburst with ampl>~3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 53m 19.96s -32d 18m 38.4s on 2016-02-20.91587 UT.
The OT unfiltered magnitude is 17.6m (the limit is 19.2m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image on 2015-02-16.96966 UT with unfiltered magnitude limit 20.5m with marginally seen OT m_OT<20.5. There is USNO-B1 star with known B2=18.6,I=18.4, so we suggest the dwarf nova outburst with ampl>3m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/115319.96-321838.4.png

MASTER OT J161028.09-004115.5 discovery - a star with proper motion

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 16h 10m 28.09s -00d 41m 15.5s on 2016-02-22.99813 UT.
The OT unfiltered magnitude is 16.8m (the limit is 17.9m).

The OT is seen in 2 images on 22Feb, and on 3 images on 23Feb(for ex.2016-02-24 01:59:16.288 m_OT=16.8), and from 2010 to 2015 on about 50 images
So there is a proper motion.

The image is available at http://observ.pereplet.ru/images/MASTEROTJ161028.09-004115.5.jpg

MASTER OT J062022.97-673306.3 discovery - OT (Mira type?)
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 06h 20m 22.97s -67d 33m 06.3s on 2016-02-21.90090 UT.
The OT unfiltered magnitude is 17.2m (the limit is 17.6m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2015-01-15.02458 UT with unfiltered magnitude limit 20.3m.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/062022.97-673306.3.png

MASTER Global Robotic Net