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MASTER: QSO optical flare and 6mag amplitude dwarf nova outburst

ATel #8465; O. Gress, P. Balanutsa, V. Vladimirov, E. Popova, V. Lipunov, E. Gorbovskoy, N. Tiurina (Lomonosov MSU), D. Buckley (SAAO), R. Rebolo Lopez, M. Serra-Ricart, N. Lodieu, G. Israelian (The Instituto de Astrofisica of Canarias), N. Samus (SAI MSU, INASAN), V. Kornilov, I. Gorbunov, D. Vlasenko, V. Shumkov (M. V.Lomonosov Moscow State University, SAI) A. Tlatov, V. Senik (Kislovodsk solar station of the Pulkovo observatory RAS), S. Potter, M. Kotze (The South African Astronomical Observatory)
on 25 Dec 2015; 22:54 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J141828.65+354249.7 detection - QSO flare

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 14h 18m 28.65s +35d 42m 49.7s on 2015-12-24.17714 UT.
The OT unfiltered magnitude is 17.3m (limit 18.5m).
The OT is seen in 4 images. We have reference image without OT on 2015-11-30.24109 UT with unfiltered magnitude limit 18.3m.
This is QSO
Previous flares, detected by MASTER-Kislovodsk, are the following
Date, UT unfiltered_mag
2012-01-13 03:33:26.177 17.5
2012-03-02 22:50:19.18 17.0
2012-07-05 20:42:26.689 16.2
2013-01-24 23:55:28.279 16.6
2013-04-30 20:34:52.285 17.3
2013-05-27 20:50:00.287 17.1
2015-08-06 18:37:09.686 17.8

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/141828.65354249.7.png

MASTER OT J024148.54+430532.2 discovery - bright (16.1m) possible dwarf nova outburst, Ampl>6.5m, no VIZIER sources

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 02h 41m 48.54s +43d 05m 32.2s on 2015-12-18.70796 UT.
The OT unfiltered magnitude is 16.1m (limit 18.6m).
The OT is seen in 10 images. It was 2015-12-14 21:01:33.467 m_OT=15.5 (2 images)
We have reference image without OT on 2015-11-06.83088 UT with unfiltered magnitude limit 20.0m. There is no any ource in VIZIER database, it means the 22mag limit from POSS history.
MASTER Global Robotic Net photometry history:
MASTER-Kislovodsk : we have previous outburst on 2009-10-28 17:36:49.506 with m_R=15.9, 2009-11-07 20:53:38.556 with m_R=16.9, 2009-11-09 20:12:56.194 with m_R=17.2,
MASTER-Amur: 2013-03-23 13:17:40.391 unfiltered m_OT=16.6, on 2013-03-28 13:30:40.161 m_OT=16.9
So the amplitude with the POSS difference is more then 6.1mag
Spectral observations are required.
The discovery and reference images are http://master.sai.msu.ru/static/OT/024148.54430532.2_1.png

MASTER OT J073936.05-351848.8 discovery - dwarf nova outburst, Ampl>3.8m
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 39m 36.05s -35d 18m 48.8s on 2015-12-21.94903 UT.
The OT unfiltered magnitude is 18.2m (limit 18.9m).We have reference image without OT on 2015-12-13.94231 UT with unfiltered magnitude limit 19.8m.
The OT preliminary MASTER photometry is the following
2015-12-23 (23:12:03-23:51:07) m_OT=18.2
2015-12-21 23:14:28.001 m_OT=18.2
2015-12-20 19:09:55.857 m_OT=18.2
2015-12-13 22:36:56 m_lim=19.8 (no OT, 22 images)
2014-12-27 22:30:36 m_OT~18.2

There is only GSC2.3.2 star, it means the usual quiet state with 22mag limit on POSS, i.e. the current outburst is with amplitude more then 3.8m

Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/073936.05-351848.8.png

Current outbursts:
MASTER-IAC auto-detection system registered current outburt of V0872 Per on 2015-12-24 23:34:40.598UT with unfiltred (0.2B+0.8R of USNO-B1) m_OT=14.7

MASTER-IAC auto-detection system registered UGSU current outburst with unfiltered m_OT=16.0

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net