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MASTER-OAFA: OT, ampl>5.2m

ATel #12687; T. Pogrosheva, V. Lipunov (Lomonosov MSU), R. Podesta, F. Podesta, C. Francile (OAFA SJNU), H. Levato (ICATE SJNU), D. Buckley (SAAO), E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, D. Zimnukhov, A. Kuznetsov, D. Vlasenko, V. Vladimirov, A. Chasovnikov, F. Balakin, V. Topolev, A. Pozdnyakov, K. Zhirkov, V. Grinshpun (Lomonosov MSU), R. Rebolo, M. Serra (IAC), O. Gress, N. Budnev, O. Ershova (ISU), V. Yurkov, Y. Sergienko, A. Gabovich (BSPU), V. Senik, A. Tlatov, D. Dormidontov (Kislovodsk solar station of the Pulkovo observatory RAS), V. Shumkov
on 25 Apr 2019; 11:59 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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


MASTER OT J111505.12-681439.8 discovery - new optical source, preliminary dwarf nova outburst with ampl>5.2m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 11h 15m 05.12s -68d 14m 39.8s on 2019-04-24.13824 UT.
The OT unfiltered magnitude is 17.2m (mlim=17.4m).
The OT is seen in 2 images(2019-04-24 03:19:04,03:10:05). There is no minor planet at this place.
We have nearest in time reference image without OT at 2019-02-20 06:10:38UT with 17.8 unfilt. magnitude limit
There is no any sources in VIZIER database, it means 22m POSS limit and more then5.2 of current outburst amplitude value.
Spectral observations are required.
The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/111505.12-681439.8.png

MASTER Global Robotic Net