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MASTER-Net: PKS2233-148 optical flare and new dwarf nova outburst

ATel #7889; O. Gress (ISU), S. Shurpakov, V. Lipunov, E. Gorbovskoy, V. Kornilov, I. Gorbunov, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Chazov, D. Vlasenko, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), V. Krushinsky, I. Zalozhnykh (Ural Federal University), D. Buckley, S. Potter, M. Kotze (South African Astronomical Observatory), R. Rebolo, M. Serra-Ricart, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov, V. Senik, A. V. Parhomenko (Kislovodsk Solar Station of the Pulkovo Observatory), N. M. Budnev, K. Ivanov (Applied Physics Institute, Irkutsk State University), Yu. Sergienko, A. Gabovich, V. Yurkov (Blagoveschensk Educational State University)
on 7 Aug 2015; 13:46 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J223634.06-143322.3 detection - QSO PKS2233-148 flare

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 22h 36m 34.06s -14d 33m 22.3s on 2015-08-05.91008 UT.

OT unfiltered magnitude is 16.0m. There are 3 images with current flare in MASTER-Kislovodsk database.

There are the following previous photometry (unfiltered magnitude, W=0.2B+0.8R USNO-B1) in MASTER-Net database:
2015-07-12.212 with m_OT=17.4 (MASTER-IAC)
2015-01-03.654UT with m_OT=16.5 (MASTER-Kislovodsk)
2015-01-02.624 with m_OT=17.5 (MASTER-Kislovodsk)
2014-10-09.724UT with m_OT= 18.7m (MASTER-Kislovodsk)
2014-08-08.907 with m_OT=16.8 (MASTER-Kislovodsk)
2014-08-07.661 with m_OT=17.2 (MASTER-Amur)
2014-06-13.975 with m_OT=15.9 (MASTER-Kislovodsk)
2015-05-17.078 with m_OT=16.0 (MASTER-SAAO)

There is QSO PKS2233-148 .

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTEROTJ223634.06-143322.3.png

MASTER OT J025211.89+465955.5 discovery - new dwarf nova outburst, no Vizier source, Ampl>5m

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 02h 52m 11.89s +46d 59m 55.5s on 2015-08-06.80365 UT.

The OT unfiltered magnitude in filter is 16.9m (limit 18.7m).

There are 3 images with OT in MASTER-Tunka database (2015-08-06.799, 06.80365, 06.807UT) and 8 images in MASTER-Kislovodsk database (2015-08-06.872, 06.882, 06.887, 06.8899UT). There is no minor planet at this place.

We have reference images without OT on 2012-01-26.47429 UT with 19.7 unfiltered magnitude limit, on 2011-09-06.869UT with m_lim=19.4, 2011-12-22.692 UT with m_lim=19.5, 2014-09-22.867UT with m_lim=19.9 in MASTER-Tunka database. There is no any source inside 5" in VIZIER database. So we can suggest dwarf nova outburst with Amplitude more then 5m

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/MASTEROTJ025211.89465955.5.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net