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ATel #10511; V. Shumkov, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, T. Pogrosheva, P. Balanutsa, A. Kuznetsov, V. Kornilov, V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress, I. Gorbunov, A. Krylov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), A. Gabovich (BSPU)
on 20 Jun 2017; 07:27 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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

MASTER OT J133257.09-314351.0 discovery - new OT (dwarf nova?) with ampl>4.3m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 13h 32m 57.09s -31d 43m 51.0s on 2017-06-20.11831 UT.

The OT unfiltered magnitude is 17.7m (mlim=19.6m).

The OT is seen in 3 images(2017-06-20 02:15:33, 02:38:46, 02:50:22UT). There is no minor planet at this place.

We have reference image without OT on 2017-05-01.16240 UT with 19.7 unfiltered magnitude limit

There is no any sources inside 5" in VIZIER database, it means 22m POSS limit in history and more then 4.3m of current outburst amplitude

Spectral observations are required.

The discovery and reference images are available at:


Current outburst of MASTER OT J143312.57-400352.5
on 2017-06-20 03:21:29.551UT with unfiltered m_OT=18.4 (W=0.2B+0.8R by USNO-B1 R1,B1/R2,B2)
http://www.aavso.org/vsx/index.php?view=detail.top&oid=473690 ATEL #9257

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net