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MASTER: young PSN(Ia) in bright PGC054958 and OTs

ATel #8903; V. Shumkov, S. Shurpakov, V. Lipunov (Lomonosov MSU), R. Rebolo Lopez (IAC), D. Buckley (SAAO), Serra Ricart, G. Israelyan (The Instituto de Astrofisica de Canarias), S. Potter, A. Kniazev (South African Astonomical Observatory), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, D. Vlasenko, I. Gorbunov, D. Kuvshinov, V. Vladimirov, E. Popova (Lomonosov Moscow State University, Sterberg Astronomical Intitute)
on 4 Apr 2016; 14:26 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

Referred to by ATel #: 8994

MASTER OT J152333.04+092125.6 discovery - possible young SN (Ia-type) in 32.2"W,39.5"N of elliptical PGC054958

MASTER-IAC auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 15h 23m 33.04s +09d 21m 25.6s on 2016-04-04.09646 UT.
PSN unfiltered magnitude is 17.7m (limit 19.5m). It is in 32.2"W,39.5"N of bright PGC054958 (Btot=14.5mag, vgsr=10750) galaxy. In this scenario our OT is very young SN. This PSN is seen in 3 images. There is no minor planet at this place. We have reference image without OT in MASTER-Kislovodsk database on 2016-03-13 01:10:24UT with 19.5 unfiltered magnitude limit.
There is also Sloan galaxy in 3.5" with red 22.9m,green 23.4m.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/152333.04092125.6.png

MASTER OT J102936.01+202108.2 discovery - red dwarf flare

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 10h 29m 36.01s +20d 21m 08.2s on 2016-04-03.89678 UT with m_OT=18.0.
The OT is seen in 5 images. There is no minor planet at this place.
The flare's photometry is the following :
2016-04-03 21:31:22.057 18.01
2016-04-03 21:34:50.078 17.35
2016-04-03 21:38:40.654 17.96
2016-04-03 21:46:51.246 19.10
2016-04-03 21:59:01 ~20.2

We have reference image without OT on 2016-03-09 23:51:11 UT with unfiltered magnitude limit 19.6m.
There is a Sloan star with green 23.3,red=21.6magnitudes The discovery and reference images are available at http://master.sai.msu.ru/static/OT/102936.01202108.2.png

MASTER OT J121623.12-533932.9 detection - pos. red giant
MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 12h 16m 23.12s -53d 39m 32.9s on 2016-04-03.78053 UT with 17.0 unfiltered magnitude (calibrated to USNOB1 as W=0.2B+0.8R)).

The OT is seen in 17 images. There is no minor planet at this place. We have reference image without OT on 2016-02-12.89409 UT with unfiltered magnitude limit 19.7m. There is a GSC star in 1" with blue 20.3m, red 18.1m, so we suggest the red giant classification.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net