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MASTER: 5 optical transients

ATel #8426; P. Balanutsa, V. Vladimirov, O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), R. Rebolo Lopez(IAC), N. Tyurina, A. Kuznetsov, V. Kornilov, E. Popova, D. Vlasenko, I. Gorbunov (Moscow State University, SAI), S. Potter, M. Kotze (South African Astronomical Observatory), M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica de Canarias), N. Budnev, O. Gress, K. Ivanov (Irkutsk State University, Applied Physics Institute), A. Tlatov, V. Senik, D. Dormidontov, A. V. Parhomenko (Kislovodsk solar station of the Pulkovo observatory RAS), V. Shumkov, S. Shurpakov
on 17 Dec 2015; 15:36 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J214436.17-644347.7 discovery - dwarf nova outburst with ampl>3.6m
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 21h 44m 36.17s -64d 43m 47.7s on 2015-12-16.87483 UT.
The OT unfiltered magnitude is 17.3m (limit 19.4m).
There are 6 images with m_OT=17.3 on 16Dec, and 2 images with m_OT=17.4 on 2015-12-15.785
We have reference image without OT on 2015-10-06.87079 UT with m_lim=20.9.
There is GALEX source in 1.3arcsec, so we suggest the dwarf nova outburst (UG) with Ampl>3.6m
Spectral observations are required.
The discovery and reference images http://master.sai.msu.ru/static/OT/214436.17-644347.7.png

MASTER OT J002543.46+260619.4 discovery - PSN(18.7m) in Sloan galaxy(21.2)

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 00h 25m 43.46s +26d 06m 19.4s on 2015-12-10.95512 UT.
The OT unfiltered (0.2B+0.8R USNOB1) magnitude is 18.7m (limit 19.9m).
The OT is seen in 2 image on this night, and 3 images with the same mag on 2015-12-09 22:09:32UT. There is no minor planet at this place.
We have reference image without OT on 2015-10-08.90470 UT with mlim=19.8.
There is a host Sloan galaxy with red_mag=21.2
Spectral observations are required.
The discovery/reference images http://master.sai.msu.ru/static/OT/002543.46260619.4.png

MASTER OT J070855.64+334109.7 discovery - possible dwarf nova outburst with Ampl>3.6(no VIZIER)

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 07h 08m 55.64s +33d 41m 09.7s on 2015-12-15.76228 UT.

The OT unfiltered magnitude is 18.4m (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 2013-12-07 17:31:03 UT with m_lim=19.1(MASTER-Tunka), on 2015-03-18 18:45:39 with m_lim=20.1, on 2011-10-27 02:15:30 with m_lim=20.3(MASTER-Kislovodsk).
There no any source in VIZIER database, so we suggest the dwarf nova outburt with amplitude more then 3.6(POSS limit is about 22m)
Spectral observations are required.
The discovery and reference images: http//master.sai.msu.ru/static/OT/070855.64334109.7.png

MASTER OT J134942.04-754405.8 discovery - OT with ampl>2.6m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 13h 49m 42.04s -75d 44m 05.8s on 2015-12-17.04424 UT with unfiltered magnitude m_OT=17.4m (limit 19.2m).
This OT is seen in 5 images (50min). There is no minor planet at this place.
We have reference images without OT on 2014-12-25.04722 UT with mlim=20.1, on 2015-12-04 00:34:03 with m_lim=19.7, on 2015-03-12 21:57:06 with m_lim=19.4.
There is no any source inside 4arcsec in VIZIER.
Spectral observations are required.
The discovery and reference images http://master.sai.msu.ru/static/OT/134942.04-754405.8.png

MASTER OT J080826.00+314125.6 discovery - dwarf nova outburst,Ampl>1.8m

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 08h 08m 26.00s +31d 41m 25.6s on 2015-12-15.65125 UT.
The OT magnitude in unfiltered is 18.5m (limit 20.2m).
The OT is seen in 4 images.We have reference image without OT on 2015-01-19.69358 UT with m_lim=19.5.

There is GALEX source, so this is dwarf nova,ampl>1.8m

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/080826.00314125.6.png

MASTER detected current outburst of CSS 101010:223019+292849 (UG) on 2015-12-16 20:18:57.352 with unfiltered m_OT=17.5

MASTER Global Robotic Net