MASTER: new CV outburst at early stage
ATel #11920; O. Gress, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), E. Gorbovskoy, V. Kornilov, N. Tiurina, O. Ershova, P. Balanutsa, A. Kuznetsov, V. Vladimirov, V. Senik (Lomonosov Moscow State University, SAI), A. Gabovich (BSPU), R. Podesta, F. Podesta, C. Francile(OAFA), H. Levato (ICATE), V. Shumkov, T. Pogrosheva
on 6 Aug 2018; 17:38 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, Request for Observations, Cataclysmic Variable, Transient, Variables
MASTER OT J165813.55-532904.7 detection - outburst at early stage, ampl>5.3m
MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 16h 58m 13.55s -53d 29m 04.7s on 2018-08-05.96013 UT.
The OT unfiltered magnitude is 16.6m (mlim=17.7).
The OT is seen in 28 images.
There is marginally seen OT with m_OT<~mlim=17.9 at 2018-08-04.750 UT image.
We have reference images on 2018-08-03.772UT with mlim=18.2; on 2017-06-24.74245 UT with unfiltered mlim=18.3m.
There is no USNO-B1 source, it means 22m limit in history and more then 5.4mag of current outburst amplitude.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/165813.55-532904.7.png
Long variable detection:
MASTER OT J171613.75-405519.8 detection with unfiltered m_OT=15.4 on 2018-08-03.04291 UT (MASTER-SAAO), m_OT=15.2 on 2018-05-18 05:53:51.783, m_OT=15.4 on 2018-07-08 04:29:03.41UT (MASTER-OAFA), no OT on 2017-08-25 02:04:26UT with unfiltered mlim=18.7, on 2016-04-28 20:24:17UT with mlim=19.4.
List of Optical Transients discovered by MASTER
MASTER Global Robotic Net
