MASTER-SAAO discovery: dwarf nova flare
ATel #7482; P. Balanutsa, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, S. Antipin, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, E. Popova, V. Vladimirov (Lomonosov Moscow State University, Sternberg Astronomical Institute), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), N. Budnev, K. Ivanov, O. Gress, S. Yazev, V. Poleshchuk (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), Yu. Sergienko, V. Yurkov, A. Gabovish (Blagoveschensk State Educational University), V. Shumkov, S. Shurpakov (MASTER-Team)
on 7 May 2015; 10:16 UT
Credential Certification: Nataly Tyurina (firstname.lastname@example.org)
Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables
MASTER OT J172304.13-804710.0 discovery - Dwarf Nova flare, Amplitude >4m
MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 17h 23m 04.13s -80d 47m 10.0s on 2015-05-03.95650 UT.
The OT unfiltered magnitude is 16.7m (the limit is 18.7m).
There are 6 images with OT on 2015-05-03.956UT - 2015-05-03.991UT. There are 2 images with OT on 2015-05-01.956 and 2015-03-01.991UT with m_OT=16.7. There is no minor planet at this place.
We have reference images without OT on 2015-04-11.951UT with 19.7 unfiltered magnitude limit, on 2014-12-17.953 with m_lim=19.4.
There is a USNO-B1 star with R1=20.08, B2=20.74. There was last flare in 1980.783 (Usno-A2.0).
Spectral observations are required.
The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/172304.13-804710.0.png
List of Optical Transients discovered by MASTER
MASTER Global Robotic Net