MASTER-OAFA: optical transients

ATel #10471; T. Pogrosheva, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), A. Tlatov, V. Senik (KSS), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress, I. Gorbunov, A. Krylov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), A. Gabovich (BSPU)
on 7 Jun 2017; 00:16 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J151755.55-220555.5 detection - poss.dwarf nova outburst, ampl>3.1m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 15h 17m 55.55s -22d 05m 55.5s on 2017-05-31.22847 UT.
The OT unfiltered magnitude is 16.9m (mlim=19.9m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-08-03.09326 UT with unfiltered magnitude limit 19.9m.
There is USNO-B1,GSC2.3 star with previous outburst in 1978.439, also GALEX source(accretion) Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/151755.55-220555.5.png

MASTER OT J152039.25-340808.5 - new OT, ampl>4.8m

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 15h 20m 39.25s -34d 08m 08.5s on 2017-06-03.99000 UT.
The OT unfiltered magnitude is 17.20m (mlim=18.1m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2016-09-24.99961 UT with magnitude limit in 'BLANK' filter 19.0m.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/152039.25-340808.5.png

MASTER OT J025640.97-423456.0 discovery - new OT, ampl>3.7m, dwarf nova?
MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 02h 56m 40.97s -42d 34m 56.0s on 2017-06-06.41986 UT. The OT unfiltered magnitude is 18.2m (mlim=19.9m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-10-08.31472 UT with magnitude limit in 'BLANK' filter 20.6m.There is no any sources in VIZIER database, it means 22m POSS limit in history and more then 3.7 mag of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/025640.97-423456.0.png

MASTER OT J115429.22-700913.3 detection - OT, ampl>2.4m
MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 11h 54m 29.22s -70d 09m 13.3s on 2017-05-31.04517 UT.
The OT unfiltered magnitude is 16.6m (mlim=18.1m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image with marginally seen OT ~19.0m on 2017-04-23.11280 UT with unfiltered m=18.8m
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/115429.22-700913.3.png

MASTER Global Robotic Net