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MASTER: dwarf novae outbursts

ATel #10174; P. Balanutsa, V. Shumkov, T. Pogrosheva, V. Lipunov (Lomonosov MSU),D. Buckley(SAAO), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, I. Gorbunov, D. Vlasenko, O. Gress, V. Vladimirov, K. Ivanov, D. Kuvshinov (Lomonosov Moscow State University, SAI)
on 16 Mar 2017; 16:11 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J081541.29-652932.8 discovery - possibly dwarf nova outburst, Ampl>5.4m
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 08h 15m 41.29s -65d 29m 32.8s on 2017-03-10.82948 UT.
The OT unfiltered magnitude is 16.6m (mlim=18.3).
The OT is seen in 4 images. There is no minor planet at this place.
We have reference image on 2015-01-16.85566 UT with unfiltered mlim=19.5m, on 2016-08-17 04:14:41UT, mlim=18.4.
There is GSC2.3.2 star in 0.7" (previous outburst in 1991y), it means 22mag POSS limits in history and more then 5.4mag of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/081541.29-652932.8.png

MASTER OT J145455.12-220409.9 discovery - possibly dwarf nova outburst, Ampl>2.8m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 14h 54m 55.12s -22d 04m 09.9s on 2017-03-10.99093 UT.
The OT unfiltered magnitude is 18.0m (mlim=18.8).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image on 2015-06-22.77133 UT with unfiltered mlim= 20.0m, on 2016-09-13 17:44:13UT with mlim=18.6.
There is USNO-B1 star with B2=20.56 R2=20.87 (MASTER W=0.2B+0.8R by thousands USNO-B1 stars), it means more then 2.8ampl of current outburst ampl.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/145455.12-220409.9.png

MASTER OT J113739.04-442929.9 discovery - dwarf nova outburst, Ampl>4.4m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 37m 39.04s -44d 29m 29.9s on 2017-03-06.91547 UT.
The OT unfiltered magnitude is 17.6m (mlim=19.3).
The OT is seen in 2 images. There is no minor planet at this place.
We have reference image on 2015-02-21.01797 UT with unfiltered mlim=20.5m, 2016-04-16 01:07:05UT with mlim=19.3. There is GSC2.3.2 known star and GALEX source(accretion process), it means 22m POSS limits in history and more then 4.4m amplitude of current outburst.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/113739.04-442929.9.png

MASTER OT J135023.27-433602.0 discovery -possibly dwarf nova outburst, Ampl>4m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 50m 23.27s -43d 36m 02.0s on 2017-03-14.92455 UT.
The OT unfiltered magnitude is 16.4m (mlim=17.9).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image on 2016-08-25.79222 UT with unfiltered mlim= 19.7m. There is GSC2.3.2 (USNO-B1,etc) star, givirng more then 4m of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/135023.27-433602.0.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net