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MASTER: 2 optical transients

ATel #8087; O. Gress, P. Balanutsa, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley N. Samus(INASAN, Lomonosov MSU, SAI), V. Kornilov, N. Tiurina, A. Kuznetsov, I. Gorbunov, D. Vlasenko (M. V. Lomonosov Moscow State University, SAI), S. Potter, M. Kotze (South African Astronomical Observatory), N. Budnev, K. Ivanov (Irkutsk State University, Applied Physics Institute), A. Tlatov, V. Senik D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University), V. Krushinskiy (Ural Federal University), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias)
on 24 Sep 2015; 01:13 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J070747.72-672205.6 detection - possible dwarf nova outburst with Ampl>3.4m
MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 07h 07m 47.72s -67d 22m 05.6s on 2015-09-21.99535 UT.
The OT unfiltered magnitude is 16.9m (limit 19.2m).
The OT is seen in 8 images. There is no minor planet at this place.
We have reference images without OT on 2014-12-25.02683 UT with unfiltered magnitude limit 20.0m, on 2015-02-24.863UT with m_lim=20.3.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTEROTJ070747.72-672205.6.png

MASTER OT J010654.20-254135.1 variability detection with Ampl>~2m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 01h 06m 54.20s -25d 41m 35.1s on 2015-09-15.99924 UT.
The OT unfiltered magnitude is 18.3m (limit 20.6m).
There are 6 images with OT:
2015-09-15 23:58:54.074 19.1
2015-09-16 00:13:36.307 19.0
2015-09-16 00:24:23.094 18.3
2015-09-23 20:33:30.316 19.9
2014-08-26 23:37:16 20.2
There is no minor planet at this place. There is star with variability in B,R, and with NUV=21.6. So we can suggest the amplitude of variability >~2m
Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net