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MASTER: optical flare of radio source AT20G and PSN in 2MASS galaxy

ATel #7525; P. Balanutsa, V. Vladimirov, V. Lipunov, E. Gorbovskoy(Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, E. Popova (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, O. Gress, K. Ivanov, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovich (Blagoveschensk State Educational University), V. Shumkov, S. Shurpakov (MASTER-Team)
on 18 May 2015; 10:53 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J122149.13-035808.6 - optical flare detection of the radio source AT20G J122148-035808

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 12h 21m 49.13s -03d 58m 08.6s on 2015-05-16.867 UT. The OT unfiltered magnitude is 17.6m (limit 20.3m).

There are 6 images with OT from 2015-05-16.867 to 16.889 UT.

There are images of previous flares on 2010-04-20.867UT with unfiltered(0.2B+0.8R) m_OT=18.4, and on 2012-01-29.035UT with m_OT=17.8 in MASTER-Kislovodsk database, and on 2014-04-19.595UT with unfiltered m_OT=17.3 in MASTER-Tunka database.

We have reference image without OT on 2015-04-21.78898 UT with unfiltered magnitude limit 18.3m.

Spectral observations are required.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/122149.13-035808.6.png

MASTER OT J111357.37-465849.1 discovery - possible SuperNova in 2MASX J11135724-4659145 galaxy or Dwarf Nova outburst(Ampl > 4.5)

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 11h 13m 57.37s -46d 58m 49.1s on 2015-05-17.85703 UT. The OT unfiltered magnitude is 17.5m (limit 19.3m).
This OT is seen in 4 images. There is no minor planet at this place. We have reference image without OT on 2015-02-15.03646 UT with 20.2 unfiltered magnitude limit.

This OT is in 25.5"N of the center of 2MASX J11135724-4659145 galaxy (v_hel=13145, m_b=16.5, GALEXASC/SUMSS, etc).
There is no any known source in VIZIER database, and during CRTS survey.
So this MASTER OT can be both PSN and dwarf nova in outburst with Ampl>4.5m .

Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/111357.37-465849.1.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net