MASTER: 2 optical transients

ATel #7151; P. Balanutsa, O. Gress, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, N. Tiurina , V. Kornilov, A. Kuznetsov, V. Chazov, V. Vladimirov (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (South African Observatory), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko (Kislovodsk solar station of the Pulkovo observatory RAS), K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), V. Shumkov, S. Shurpakov (MASTER-Team)
on 27 Feb 2015; 14:34 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J135329.90-421622.5 - possible SN or Dwarf Nova

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 13h 53m 29.90s -42d 16m 22.5s on 2015-02-27.02082 UT.

The OT unfiltered magnitude is 17.8m (the limit is 19.6m).

There are 11 images with OT on this night.

We have reference image without OT on 2015-01-01.03934 UT with 19.2 unfiltered magnitude limit.

There is unknown galaxy (blue source) near this OT, offset is 8".

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTERJ135329.90-421622.5.jpg

Spectral observations are required.

MASTER OT J210824.05+232829.0 - possible Dwarf Nova

MASTER-Kislovodsk auto-detection system discovered OT source at (RA, Dec) = 21h 08m 24.05s +23d 28m 29.0s on 2015-02-26.08786 UT.

The OT unfiltered magnitude is 16.8m (the limit is 19.1m).

There are 8 images with OT at this night. There is no minor planet at this place.

We have reference image without OT on 2010-10-26.759 UT with 19.7 unfiltered magnitude limit.

This OT can be identical to SDSS J210824.09+232829.0 with rmag=20.875 and gmag=21.288.

The discovery and reference images are available at http://master.sai.msu.ru/static/OT/MASTERJ210824.05+232829.0.jpg

Spectral observations are required.

MASTER Global Robotic Net