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GCN Circular 20715

Subject
LIGO/Virgo G274296: Global MASTER Net PSN and QSO detection
Date
2017-02-21T23:08:53Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov2007@gmail.com>
V.M.  Lipunov,  E. Gorbovskoy, T.Pogrosheva, N.Tyurina,  P.Balanutsa, 
V.Shumkov, V. Kornilov, A.Kuznetsov, M.I.Panchenko, A.V.Krylov, I.Gorbunov
Lomonosov Moscow State University, Sternberg Astronomical Institute

N.M. Budnev, O. Gress, K. Ivanov, S.Yazev
Irkutsk State University

R.Podesta, C.Lopez, F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA) , National University of San 
Juan, Argentina

H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina

D.Buckley, S. Potter, M. Kotze,
   South African Astronomical Observatory

R. Rebolo, M. Serra-Ricart, G. Israelian, N.Lodiu
The Instituto de Astrofisica de Canarias

A. Tlatov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory

V.Yurkov, Yu.Sergienko, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk

During inspection of LIGO event G274296 (Shawhan et al.
GCN20689, Lipunov et al. GCN20696, GCN20712) MASTER-Tunka  detected the 
following additional optical transients:

1) MASTER OT J144935.82+343749.9 discovery - PSN (18.0m) in SDSS 
galaxy(r=20.9)

During GW inspection survey MASTER-Tunka auto-detection system discovered 
OT source at (RA, Dec) = 14h 49m 35.82s +34d 37m 49.9s on 2017-02-21.77409UT.

The OT unfiltered magnitude is 18.0m (mlimit 19.4m).

The OT is seen in 2 images. There is no minor planet at this place.

There is SDSS galaxy with red m=20.94 http://skyserver.sdss.org/dr9/en/tools/quicklook/quickobj.asp?id=1237662226228118204

We have reference image without OT on 2016-12-05.94591 UT with unfiltered 
magnitude limit m=20.0m.

Spectral observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/144935.82343749.9.png



MASTER OT J082950.02+274024.3 - possibly QSO outburst

During GW inspection survey MASTER-Tunka auto-detection system discovered 
OT source at (RA, Dec) = 08h 29m 50.02s +27d 40m 24.3s on 2017-02-21.56417 UT.
The OT unfiltered magnitude is 19.1m (limit 20.1m).

The OT is seen in 3 images. There is no minor planet at this place.

We have reference image without OT on 2015-11-19.71169 UT with unfiltered 
magnitude limit m=20.1m.

There is GALEX source in 0.8" and this OT is in 1" from	SDSS DR10 
catalogue of candidate quasars (Brescia+, 2015), i.e. our OT is QSO in 
outburst.

Spectral observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/082950.02274024.3.png
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