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MASTER: PSN in PGC052589 and new dwarf nova

ATel #7618; P. Balanutsa, O. Gress, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, S. Antipin, N. Tiurina, V. Kornilov, V. Chazov, A. Kuznetsov, E. Popova, V. Vladimirov (Lomonosov Moscow State University), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, 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)
on 11 Jun 2015; 10:25 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

Referred to by ATel #: 7623

MASTER OT J144326.01+572541.2 discovery - PSN in VII Zw561 galaxy

MASTER-Kislovodsk auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 14h 43m 26.01s +57d 25m 41.2s on 2015-06-09.85058 UT. The OT unfiltered magnitude is 18.6m (the limit 19.5m).

There are 3 images with this possible SuperNova. We have reference image without OT on 2014-03-22.92618 UT with 19.8 unfiltered magnitude limit.

This PSN is in 3.1"E and 14.4"S from the PGC052589 galaxy (V_hel=20375km/s, g_mag=16.9)

Spectral observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/144326.01572541.2.png

MASTER OT J203952.33-304804.3 discovery - new Dwarf Nova in outburst with Ampl>5m, no known sources in VIZIER

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 20h 39m 52.33s -30d 48m 04.3s on 2015-06-11.00484 UT. The OT unfiltered magnitude is 17.0m (limit 19.2m).

The OT is seen in 3 images. There is no minor planet at this place.

We have reference images without OT on 2015-03-31.07429 UT with unfiltered magnitude limit 20.7m. There is no known sources in VIZIER database inside 5". So we can suggest the dwarf nova outburst with Amplitude > 5m.

Spectral observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/203952.33-304804.3.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net