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MASTER optical transients

ATel #9042; P. Balanutsa, V. Shumkov, E. Gorbovskoy, V. Lipunov(Lomonosov MSU), D. Buckley, S. Potter (SAAO), R. Rebolo, M. Serra-Ricart, G. Israelyan(IAC),N. Tiurina, V. Kornilov, I. Gorbunv, E. Popova, V. Vladimirov, D. Kuvshinov(Lomonosov MSU), N. Budnev, O. Gress, K. Ivanov (API, ISU)
on 12 May 2016; 01:19 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Cataclysmic Variable, Variables

MASTER OT J153105.22-260437.2 discovery - new dwarf nova outburst, no VIZIER sources, Ampl>4.3m

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 349171 ) discovered OT source at (RA, Dec) = 15h 31m 05.22s -26d 04m 37.2s on 2016-05-07.99397 UT.
The OT unfiltered magnitude is 17.7m (limit 20.0m).
The OT is seen in 9 images. There is no minor planet at this place.
We have reference image without OT on 2015-06-20.81741 UT with unfiltered magnitude limit 20.9m.
There is no known sources in VIZIER database, it means the amplitude of curent outburst is more then 4.3m(22m POSSS limit)
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/153105.22-260437.2.png

MASTER OT J070040.17-754730.4 discovery - possible dwarf nova, Ampl>4.6m

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 07h 00m 40.17s -75d 47m 30.4s on 2016-05-10.71635 UT.
The OT unfiltered magnitude is 17.4m (limit 19.2m).
The OT is seen in 4 images. There is no minor planet at this place.
We have reference image without OT on 2015-01-15.94891 UT with unfiltered magnitude limit 20.0m.
There is only GSC2.3.2 known blue source (jmag=20.4, but it's out of USNO-B1, so the ampl>4.6m)
Spectral observations are required.
http://observ.pereplet.ru/images/MASTEROTJ070040.17-754730.4.png

MASTER OT J140056.11+352727.1 discovery - red dwarf flare

MASTER-IAC auto-detection system discovered OT source at (RA, Dec) = 14h 00m 56.11s +35d 27m 27.1s on 2016-05-06.02993 UT.
The OT unfiltered magnitude is 17.0m (limit 20.4m).
The OT is seen in 5 images. There is no minor planet at this place.
We have reference image without OT on 2016-03-01.20914 UT with unfiltered magnitude limit 19.4m.
There is a red star at this place. There is the flare http://observ.pereplet.ru/images/MASTEROTJ140056.11+352727.1.gif

MASTER OT J064233.16+295953.7 discovery - possible dwarf nova outburst, Ampl>5.3m,no sources in VIZIER

MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 06h 42m 33.16s +29d 59m 53.7s on 2016-05-04.58204 UT.
The OT unfiltered magnitude is 16.7m (limit 17.5m).
There are 3 images with OT. There is no minor planet at this place.
We have reference image without OT on 2015-02-08.68466 UT with 20.1 ufiltered magnitude limit in MASTER-Kislovodsk database.
There is no known sources in VIZIER database(22m POSS limit), so the ampl of the outburst is more then 5.3m.
Spectral observations are required.
The discovery and reference images are http://observ.pereplet.ru/images/MASTEROTJ064233.16+295953.7.jpg

MASTER Global Robotic Net