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MASTER: 2 PSN and dwarf novae outbursts

ATel #8276; P. Balanutsa, V. Shumkov, O. Gress, E. Popova, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), R. Rebolo (IAC), D. Buckley (SAAO), N. Tiurina, V. Kornilov, A. Kuznetsov, I. Gorbunov, D. Vlasenko, V. Vladimirov (M. V.Lomonosov Moscow State University, SAI), M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), S. Potter, A. Kniazev, M. Kotze (South African Astronomical Observatory), A. Tlatov, A. V. Parhomenko, D. Dormidontov, V. Senik (Kislovodsk Solar Station of the Pulkovo Observatory), K. Ivanov, N. M. Budnev(Irkutsk State University), V. Yurkov, Yu. Sergienko, A. Gabovich, E. Sinyakov (Blagoveschensk Educational State University), V. Krushinski, I. Zalozhnih (Ural Federal University)
on 11 Nov 2015; 23:33 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER022037.36+170217.5 discovery - PSN in Sloan galaxy

MASTER-IAC auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 02h 20m 37.36s +17d 02m 17.5s on 2015-11-04.971 UT.
The OT unfiltered magnitude is 18.4m (the limit is 20.3m).
The OT is seen in 3 images. We have reference image without OT on 2015-07-17.21884 UT with unfiltered magnitude limit 19.1m. There is no known source at this place in VIZIER (POSS,etc)
This PSN is in 5.7" from the andin 8.6" from the SDSS J022037.95+170218.0 galaxy.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ022037.36+170217.5.jpg

MASTER OT J022602.32+170340.8 discovery - SN in 2MASX J02260249+1703274 galaxy

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 02h 26m 02.32s +17d 03m 40.8s on 2015-11-08.16294 UT.
The OT unfiltered magnitude is 17.8m (limit 19.4m). There are 3 images on 2015-11-08.16294/08.17955/08 and 2 images with m_OT=18.0 on 2015-11-11 21:58:17UT. We have reference image without OT on 2015-09-09.17656 UT with unfiltered magnitude limit 19.9m.
This PSN is in 13" from 2MASX J02260249+1703274 galaxy.
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/022602.32170340.8.png

MASTER OT J081331.95-232924.7 discovery - dwarf nova outburst with Ampl>3.1m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 08h 13m 31.95s -23d 29m 24.7s on 2015-11-10.95106 UT.
The OT unfiltered magnitude is 16.8m (the limit is 19.1m). This OT is seen in 9 images. We have reference image without OT on 2015-10-28.97572 UT with unfiltered magnitude limit 18.5m.
There is USNO B1 star with B2=20.49 (GSC red=19.76). So we suggest the dwarf nova outburst with amplitude more than 3.1m (MASTER unfiltered W=0.2B+0.8R //USNOB1)
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/081331.95-232924.7.png

MASTER OT J191535.00-620318.7 discovery dwarf nova outburst with Ampl>3.6m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h 15m 35.00s -62d 03m 18.7s on 2015-11-03.83105 UT.
The OT unfiltered magnitude is 17.4m (the limit is 19.9m). This OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2015-05-25.94251 UT with unfiltered magnitude limit 21.0m. There is USNO-B1 star with B2=20.92, R2=19.94.
So we suggest the dwarf nova outburst with amplitude more than 3.6m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/191535.00-620318.7.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net