MASTER: optical transients discovery

ATel #7499; V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Chazov, E. Popova(Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, O. Gress, S. Yazev, V. Poleshchuk (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 12 May 2015; 22:46 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J061814.95-340611.3 discovery - new Dwarf Nova, ouburst with Ampl>3m

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 06h 18m 14.95s -34d 06m 11.3s on 2015-05-11.75362 UT.

The OT unfiltered magnitude is 18.2m (the limit is 19.1m).

There are 6 images with OT on 2015-05-11. There is previous outburst of this OT in MASTER-SAAO database on 2014-12-25.946 with unfiltered m_OT=17.6.

We have reference images without OT on 2015-02-18.85028 UT with 20.7 unfiltered magnitude limit, on 2015-01-17.010 with m_lim=19.6 and on 2015-03-30.872 with m_lim=19.

There is no known VIZIER source inside 4". CRTS observed this area, but didn't see any objects. So the Amplitude of this MASTER dwarf nova's outburst is more than 3m.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/061814.95-340611.3.png

Spectral observations are required.

MASTER OT J102440.22-202022.3 - Red dwarf's flare

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 10h 24m 40.22s -20d 20m 22.3s on 2015-05-11.82216 UT.

This is a red dwarf's flare(UVCet type) with 17.6 unfiltered magnitude in max.

There are 2 images with OT flare, and 1 image after it. The flare photometry is the following:
Date, Unfiltered mag
2015-05-11.822 19.5 (the beginning of flare)
2015-05-11.829 17.6
2015-05-11.837 19.8 (the limit)

We have reference image without OT on 2014-12-24.01145 UT with 19.7 unfiltered magnitude limit.

The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/102440.22-202022.3.png

Spectral observations are required.

MASTER Global Robotic Net