Аннотация: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