MASTER: PKS 1142-225 optical flare

ATel #10068; T. Pogrosheva, V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), E. Gorbovskoy, N. Tiurina, P. Balanutsa, V. Kornilov, A. Kuznetsov, I. Gorbunov, A. Krylov (Lomonosov MSU), C. Lopez, F. Podesta (OAFA), C. Saffe (ICATE), D. Kuvshinov, V. Shumkov
on 10 Feb 2017; 23:09 UT
Credential Certification: Nataly Tyurina (

Subjects: Optical, Request for Observations, Blazar, Quasar, Transient

MASTER OT J114522.02-225031.4 detection - optical flare of QSO PKS 1142-2250, Ampl>3.8m

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 11h 45m 22.02s -22d 50m 31.4s on 2017-02-10.26340 UT.
The OT unfiltered magnitude is 16.7m (mlimit=18.0m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-08-01.05029 UT with unfiltered mlim=18.5m.
There is QSO in VIZIER database (GALEX source, etc.) with USNO-B1 B2=21.86, R2=20.14
Spectral observations are required.
The discovery and reference images are available at

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net