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Five OTs detected by Global Robotic MASTER Net

ATel #8232; P. Balanutsa, E. Popova, O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), N. Samus(INASAN, SAI),V. Kornilov, N. Tiurina, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Chazov, V. Shumkov (M. V. Lomonosov MSU, SAI),S. Potter, M. Kotze (South African Astronomical Observatory), 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 31 Oct 2015; 12:34 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Transient

MASTER OT J110438.28-441951.6 discovery - dwarf nova outburst with Ampl>4.5m

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 11h 04m 38.28s -44d 19m 51.6s on 2015-10-30.06735 UT. The OT unfiltered magnitude is 17.5m (limit 18.7m). The OT is seen in 6 images. We have reference image without OT on 2015-05-20.78141 UT with unfiltered magnitude limit 20.5m. There is no known optical source in VIZIER (22m lim at POSS), CRTS observed this area, but never seen any object. So we suggest the dwarf nova outburst with amplitude more then 4.5mag
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/110438.28-441951.6.png

MASTER OT J194142.51-563815.7 discovery – dwarf nova outburst, Amplitude more then 4.9m.

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h 41m 42.51s -56d 38m 15.7s on 2015-10-25.80803 UT. The OT unfiltered magnitude is m_OT=17.1 (the limit is 18.5m, 6 images), m_OT=17.4 on 2015-10-26 18:38:50.366UT(2 images). There is no minor planet at this place. We have reference image without OT on 2015-03-23.04023 UT with unfiltered magnitude limit 20.2m. There is no known optical source at this place (VIZIER database, POSS limit is 22m). There is only Allwise source with W1=17.109, W2=17.373, W3=12.745. So there is a dwarf nova outburst with Amplitude more then 4.9m. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/194142.51-563815.7_1.png

MASTER OT J184709.24-495633.9 – dwarf nova outburst with Amplitude more then 3.4m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 18h 47m 09.24s -49d 56m 33.9s on 2015-10-25.79044 UT. The OT unfiltered magnitude is 17.2m (limit is 18.3m, 4 images). There is no minor planet at this place. MASTER-SAAO reobserved it on 2015-10-26 18:06:20.857 , m_OT=17.7 (2 images). We have reference image without OT on 2015-02-17.102UT with unfiltered magnitude limit 19.4m. There is USNO B1 star with B2=20.83, R2=20.58. So there is classic dwarf nova outburst with amplitude more then 3.4m. The discovery and reference images are available at http://master.sai.msu.ru/static/OT/184709.24-495633.9.png

MASTER OT J020836.79-104018.8 discovery

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 02h 08m 36.79s -10d 40m 18.8s on 2015-10-23.07405 UT. The OT magnitude in I-band is 17.0m (limit 18.4m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-10-21.07257 UT with unfiltered magnitude limit 21.1m. There is 2MASS and WISE source with J=14.873, H=14.243, K=13.851 http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=&-out.add=_r&-out.add=_RAJ%2C_DEJ&-sort=_r&-to=&-out.max=20&-meta.ucd=2&-meta.foot=1&-c=32.153291666667+-10.671888888889&-c.rs=5 The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/020836.79-104018.8.png

MASTER OT J060553.93+283325.6 - dwarf nova outburst with Amplitude more then 3.9m

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 06h 05m 53.93s +28d 33m 25.6s on 2015-10-25.75079 UT. The OT unfiltered (W=0.2B+0.8R, calibrated to USNO-B) magnitude is 15.5m (the limit is 18.0m). The OT is seen in 9 images. We have reference image without OT on 2013-12-01.66689 UT with unfiltered magnitude limit 18.9m. There is USNO-B1 star with B2=20.53,R2=19.10,I=17.9, no JHK, so this OT is dwarf nova outburst with Amplitude more then 3.9m. Spectral observations are required. The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ060553.93+283325.6.jpg

MASTER Global Robotic Net