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MASTER: PSN in PGC700974 and2 OT

ATel #8154; P. Balanutsa, 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, E. Popova, 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), O. Gress, 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 11 Oct 2015; 23:27 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J054404.79-314655.2 discovery - PSN in 17.5"E,40.7"N from the center of PGC700974

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 05h 44m 04.79s -31d 46m 55.2s on 2015-10-11.04644 UT.
The OT unfiltered magnitude is 17.8m (the limit is 20.1m).
The OT is seen in 4 images. There is no minor planet at this place.
This PSN is in 17.5"E,40.7"N from the center of PGC700974
We have reference image without OT on 2015-02-19.81096 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/054404.79-314655.2.png

MASTER OT J015119.13-643046.6 - possible dwarf nova outburst, Ampl>2m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 01h 51m 19.13s -64d 30m 46.6s on 2015-10-06.02544 UT.
The OT unfiltered magnitude is 19.0m (limit 20.3m).
There are 3 images with OT on 2015-10-06.025 and 2 images with m_OT=19.2 this night 2015-10-09.947UT (m_lim=20.2). There is no minor planet at this place. We have reference images without OT on 2015-01-11.80993 UT with unfiltered magnitude limit 19.6m, on 2015-06-07 with m_lim=19.0, 2015-02-23 with m_lim=19.7, 2015-01-11 with marginally seen OT less brighter then m_lim=19.6. There is USNO B1 star with B1=19.52,R1=21.39,I=17.57, so we suggest the dwarf nova outburst with Ampl>2m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/015119.13-643046.6.png

MASTER OT J194753.58-475722.9 discovery - opticla transient outburstwith Ampl>3m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 19h 47m 53.58s -47d 57m 22.9s on 2015-10-05.85932 UT.
The OT unfiltered magnitude is 17.2m (limit 20.0m).
The OT is seen in 2 images. There is no minor planet at this place. We have reference images without OT on 2015-02-24.12624 UT with unfiltered magnitude limit 19.3m.
There is USNO B1 star with only R=20.46 and JHK=15.04/14.31/13.87. So we suggest the optical transient outburst with Ampl>3m
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTER194753.58-475722.9.jpg

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net