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MASTER-SAAO: PSN in 6dF disc galaxy and 3 dwarf nova outbursts

ATel #8135; E. Popova, P. Balanutsa, O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), V. Kornilov, N. Tiurina, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Chazov, V. Shumkov (M. V. Lomonosov MSU, SAI),R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), A. Tlatov, V. Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Krushinskiy (Ural Federal University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 6 Oct 2015; 23:40 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER 022011.63-531848.9 discovery - PSN in 14arsec from the blue 6dF J0220126-531859 disc galaxy (125Mpc)

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 02h 20m 11.63s -53d 18m 48.9s on 2015-10-06.03044 UT.
The OT unfiltered magnitude is 18.1m (the limit is 20.4m).
This PSN is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-02-21.81728 UT with 20.7 unfiltered magnitude limit .
This PSN is in 14 arsec from the blue 6dF J0220126-531859 galaxy (16.6m, 125Mpc)
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/022011.63-531848.9.png

MASTER OT J095045.47-300121.6 discovery - OT outburst with Ampl>4.3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 09h 50m 45.47s -30d 01m 21.6s on 2015-10-06.11071 UT.
The OT unfiltered magnitude is 17.8m (limit 19.9m).
The OT is seen on 4 images at 2015-10-06.11317UT and 06.1107UT. There is no minor planet at this place. We have reference images without OT on 2014-12-23.97030 UT with 19.9 unfiltered magnitude limit , on 2015-01-15.012UT with mlim=19.7, on 2015-03-09.833UT with m_lim=19.8.
There is GSC232 star with blue jmag=22.16, so we can suggest the dwarf nova outburst with Ampl>4.3m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/095045.47-300121.6.png

MASTER OT J030825.67-510254.3 discovery - possible dwarf nova outburst with Ampl>3.3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 03h 08m 25.67s -51d 02m 54.3s on 2015-10-06.03791 UT.
The OT unfiltered magnitude is 18.4m (limit 21.0m).
The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-03-26.77461 UT with 19.1 unfiltered magnitude limit, on 2015-09-24.109UT with m_lim=20.3, on 2015-09-16.893UT with m_lim=20.7. There is USNO-B1 star with B2=21.89, R2=23.45, so we can suggest the dwarf nova outburst with amplitude more then 3.6m.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/030825.67-510254.3.png

MASTER OT J164126.34-193729.2 discovery - possible dwarf nova outburst with Ampl>3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 16h 41m 26.34s -19d 37m 29.2s on 2015-10-06.75594 UT.
The OT unfiltered magnitude is 17.7m (limit 19.4m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-01-31.09412 UT with unfiltered magnitude limit 19.3m. There is USNO-B1 star with B2=18.90,R2=19.24,I=18.51, B(USNO-A2)=21.1. 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/164126.34-193729.2.png

MASTER Global Robotic Net