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MASTER-SAAO: 2 dwarf nova outbursts

ATel #8919; E. Gorbovskoy, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, V. Vladimirov, O. Gress, K. Ivanov, I. Gorbunov (Lomonosov MSU, SAI), S. Potter, A. Kniazev (South African Astronomical Observatory)
on 7 Apr 2016; 10:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J164339.02-575305.2 discovery - possible dwarf nova outburst, Ampl>5.3mag

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, v.2010, 30L) ) discovered OT source at (RA, Dec) = 16h 43m 39.02s -57d 53m 05.2s on 2016-04-02.89494 UT.
The OT unfiltered magnitude is 16.7m (limit 18.3m).
The OT is seen in 12 images(). There is no minor planet at this place. We have reference image without OT on 2016-03-10.13561 UT with unfiltered magnitude limit 18.9m.
There is no known sources inside 3", so we can suggest the dwarf nova outburt with amplitude more then 5.3mag, taking into account the POSS archive limit.
Spectral observations are required.
The discovery and reference images are available at http://master.sai.msu.ru/static/OT/164339.02-575305.2.png

MASTER OT J211800.83-704807.4 discovery - possible dwarf nova outburst with Ampl>4.7

MASTER-SAAO auto-detection system discovered OT source at (RA, Dec) = 21h 18m 00.83s -70d 48m 07.4s on 2016-04-03.04868 UT.
The OT unfiltered magnitude is 17.3m (limit 19.8m).
The OT is seen in 5 images. There is no minor planet at this place. We have reference image without OT on 2016-01-10.81130 UT with unfiltered magnitude limit 20.5m.
There is no known sources inside 4" in VIZIER database, so we suggest the outburst amplitude more then 4.7mag (22m POSS limit)
Spectral observations are required. The discovery and reference images are available at http://master.sai.msu.ru/static/OT/211800.83-704807.4.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net