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MASTER: fast optical transient

ATel #7312; V. Vladimirov, V. Lipunov, E. Gorbovskoy (Lomonosov MSU), D. Buckley (SAAO), S. Antipin, P. Balanutsa, N. Tiurina, V. Kornilov, A. Kuznetsov, V. Chazov, E. Popova, S. Shurpakov, V. Shumkov (Lomonosov Moscow State University, SAI), S. Potter, A. Kniazev, M. Kotze (The South African Astronomical Observatory), O. Gress, K. Ivanov, N. Budnev, S. Yazev, V. Poleshchuk, E. Konstantinov, O. Chuvalaev (Irkutsk State University), A. Tlatov, D. Dormidontov, V. Senik, A. Parkhomenko, (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Y. Sergienko, A. Gabovich (Blagoveshchensk Educational University), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University)
on 30 Mar 2015; 16:38 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J135745.46-285529.2 discovery - fast optical transient

MASTER-SAAO auto-detection system ( Lipunov et al., Advances in Astronomy, MASTER Global Robotic Net, 2010 ) discovered OT source at (RA, Dec) = 13h 57m 45.46s -28d 55m 29.2s on 2015-03-24.91368 UT.

The OT unfiltered magnitude is 18.9m (limit is 20.1m) at discovery image (preliminary photometry is at the picture).

The OT is seen in 5 images in both tubes. We have reference image without OT on 2015-02-19.03017 UT with 21.0 unfiltered magnitude limit.
We have reference images without OT on 2015-03-06 with 18.6m limit, and on 2015-03-28.927 with m_lim=19.5.

There is no minor planet at this place. There is only WISE possible source with Wmags, without JHK. There is no known UBVRI. There is no sources in CRTS and NSVS archive.

Spectral observations are required.

The discovery and reference image and light curve are available at http://master.sai.msu.ru/static/OT/MASTERJ135745.46-285529.2.jpg

Spectral observations are required.

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net