MASTER-Net: 3 dwarf novae outburst
ATel #7616; P. Balanutsa, V. Lipunov(Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, E. Popova, V. Vladimirov (Lomonosov Moscow State University, Sterbverg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, O. Gress, S. Yazev, V. Poleshchuk (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University)
on 10 Jun 2015; 18:20 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables
MASTER OT J230451.19-595649.6 discovery - Dwarf Nova outburst, Ampl>4.7m
MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 )discovered OT source at (RA, Dec) = 23h 04m 51.19s -59d 56m 49.6s on 2015-06-09.02750 UT.
The OT unfiltered (W=0.2B+0.8R) magnitude is 17.2m (the limit is 19.0m).
There are 3 images with OT.
We have reference images without OT on 2014-12-27.841UT with 19.0 unfiltered magnitude limit and on 2015-04-09.087UT with m_lim=18.5.
There is no minor planet at this place. There is GSC2.3 star with Bj=21.9. So we can suggest the dwarf nova outburst with Amplitude > 4.7m .
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/014644.56482650.2_1.png
MASTER OT J083525.62-080505.3 discovery - dwarf nova outburst, Ampl>3.4m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 08h 35m 25.62s -08d 05m 05.3s on 2015-06-09.72113 UT.
The OT unfiltered magnitude is 16.8m (limit 19.2m).
There are 3 images with OT. There is no minor planet at this place.
We have reference image without OT on 2015-01-22.92102 UT with unfiltered magnitude limit 19.7m.
There is USNOB1 star with B2=20.47 and R2=20.19. So we can suggest the dwarf nova outburst with Ampl>3.4m
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/083525.62-080505.3.png
List of Optical Transients discovered by MASTER
MASTER Global Robotic Net
 = 01h 46m 44.56s +48d 26m 50.2s on 2015-06-08.92910 UT.
The OT unfiltered magnitude is <b>16.0m</b> (limit 18.2m).
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There 4 images with OT on 2015-06-(08.929-08.952)UT with m_OT=16.0, and 6 images on 2015-06-(09.954-09.971)UT with m_OT=16.2.
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We have reference images with m_OT=19.0 on 2011-10-30.891 UT, on 2012-09-16.911 with m_OT=19.3, on 2014-01-03.687 with marginally m_OT=19.8.
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There is USNO B1 star with B2=19.63 and R2=19.46, I=18.52. So we can suggest the dwarf niva outburst with Ampl>3.5m.
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Spectral observations are required.
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The discovery and reference images are available at <a href=){kind=link}
