MASTER: >8mag ampl OT (PN)

ATel #12071; T. Pogrosheva, V. Lipunov (Lomonosov MSU), D. Buckley (SAAO), R. Podesta, F. Podesta, C. Lopez, C. Francile (OAFA, San Juan National University), R. Rebolo Lopez, M. Serra-Ricart (IAC), E. Gorbovskoy, N. Tiurina, P. Balanutsa, A. Kuznetsov, V. Kornilov, O. Gress, D. Zimnukhov, V. Vladimirov, A. Gabovich, V. Shumkov, V. Senik, D. Kuvshinov (Lomonosov Moscow State University, SAI)
on 2 Oct 2018; 09:12 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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MASTER OT J155814.41-163017.1 discovery - possible Nova outburst, ampl>8mag

MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 15h 58m 14.41s -16d 30m 17.1s on 2018-09-29.77081 UT during Fermi trigger inspection.
The OT unfiltered magnitude is 13.2m (mlim=18.6).
The OT is seen in 8 images. There is no minor planet at this place.
We have reference image on 2016-03-13.00919 UT with unfiltered mlim= 20.4m (MASTER-SAAO), the nearest in time reference image was on 2018-09-21 00:34:52 with mlim=18.3 (MASTER-OAFA).
There is no objects in USNO-B1, but there is optical source in PanSTARR and Sloan surveys with rmag=21.5

Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/155814.41-163017.1.png

MASTER Global Robotic Net