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MASTER-Net: PSN and 3 OTs

ATel #8700; E. Gorbovskoy, P. Balanutsa, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez, M. Serra Ricart (IAC), D. Buckley(SAAO), G. Israelian (IAC), N. Tiurina, V. Kornilov, A. Kuznetsov, O. Gress, V. Shumkov, I. Gorbunov, D. Vlasenko, V. Vladimirov, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, M. Kotze (The South African Astronomical Observatory), A. Tlatov, V. Senik, D. Dormidontov, A. Parkhomenko(Kislovodsk Solar Station, Main Pulkovo observatory)
on 16 Feb 2016; 00:13 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J163355.46+860830.4 discovery - PSN in WHIJ1633+86 galaxy

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 16h 33m 55.46s +86d 08m 30.4s on 2016-02-13.88456 UT.
The OT unfiltered magnitude is 17.0m (limit 18.6m). The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2015-09-12.97137 UT with unfiltered magnitude limit 19.2m.
This PSN is in 2.96" from the WHIJ1633+86 galaxy
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/163355.46860830.4.png

MASTER OT J192312.67-571511.7 discovery - dwarf nova outburst with Ampl>4m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h 23m 12.67s -57d 15m 11.7s on 2016-02-15 02:45:20.193UT.
The OT unfiltered magnitude is 18.0m (the limit is 19.6m). The OT is seen in 3 images. There is no minor planet at this place. We have reference image without OT on 2015-11-16 18:23:52 with 19.4 unfiltered magnitude limit.
There is no any known source in VIZIER database, it means the 22m POSS previous limits. So we suggest the dwarf nova outburst with Ampl>4m.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ192312.67-571511.7.png

MASTER OT J135730.06-122634.1 discovery - OT with Ampl>2.7m

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 13h 57m 30.06s -12d 26m 34.1s on 2016-02-09.99758 UT.
The OT unfiltered magnitude is 19.3 (the limit is 20.0m).
The OT is seen in 3 images. We have reference image without OT on 2014-05-26.77630 UT with unfiltered magnitude limit 19.9m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/135730.06-122634.1.png

MASTER OT J083042.70-214209.4 detection - possible UVCet type flare

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 08h 30m 42.70s -21d 42m 09.4s on 2016-02-11.02641 UT.
The OT unfiltered magnitude is 18.1m (limit 19.6m). The OT is seen in 3 images http://master.sai.msu.ru/static/OT/MASTER083042.70-214209.4.gif at 2016-02-11 00:38:03/00:41:46/00:45:56 UT. So we suggest the red dwarf's flare.
We have reference image without OT on 2015-12-17.13876 UT with unfiltered magnitude limit 19.8m.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/083042.70-214209.4.png

MASTER Global Robotic Net