MASTER: optical transients

ATel #10353; P. Balanutsa, V. Shumkov, O. Gress, T. Pogrosheva, E. Popova, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, A. Kuznetsov, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, 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 6 May 2017; 10:28 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J202438.12-224741.0 discovery - new OT, no VIZIER data, Ampl>3.4m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 20h 24m 38.12s -22d 47m 41.0s on 2017-04-30.08943 UT.
The OT unfiltered magnitude is 18.6m (mlim=19.8).
The OT is seen in 3 images (2017-04-30 02:12:39,02:08:47,01:50:43UT).
We have reference image on 2017-03-20 02:05:13 with mlim=19.4, on2015-04-01.10850 UT with unfiltered mlim= 19.4m.
There is no known sources in VIZIER Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/202438.12-224741.0.png

MASTER OT J091429.59-700150.4 discovery - dwarf nova outburst, Ampl>4.1m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 09h 14m 29.59s -70d 01m 50.4s on 2017-04-27.89035 UT.
The OT unfiltered magnitude is 16.2m(mlim=19.8).
The OT is seen in 4 images. There is no minor planet at this place.
We have reference image on 2015-10-21.05554 UT with unfiltered mlim=20.3m,it means amplitude of current outburst is more then 4.1mag
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/091429.59-700150.4.png

MASTER OT J142907.93-434744.6 discovery - dwarf nova outburst, Ampl>5.1m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 14h 29m 07.93s -43d 47m 44.6s on 2017-04-22.93185 UT.
The OT unfiltered magnitude is 16.9m (mlim=20.0).
The OT is seen in 3 images on 2017-04-22 22:21:52.229,22:33:03.047,22:45:44.705 with unfiltered m_OT=16.9, and on 3 images on 2017-04-23 20:55:31.66,21:47:27.783,21:51:26.006 with m_OT=17.2. We have reference image on 2016-03-10.04072 UT with unfiltered mlim= 21.0m.
22 mag limit in history(POSS) means more then 5.1 mag of current outburst ampl.
Spectral observations are required.
The discovery and reference images are available at
http://master.sai.msu.ru/static/OT/142907.93-434744.6.png

MASTER OT J174155.54-620817.1 discovery - poss. dwarf nova outburst, Ampl>4.5mag

MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 17h 41m 55.54s -62d 08m 17.1s on 2017-04-28.24921 UT.
The OT unfiltered magnitude is 17.5m (mlim=19.3m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-08-24.09389 UT with 19.7 unfiltered magnitude limit. There is only GSC2.3.2 star in 0.8" with known blue jmag=21.56 , it means 22m POSS limit in history and more then 4.5mag of current outburst amplitude
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/174155.54-620817.1.png

MASTER Global Robotic Net