TITLE:   GCN CIRCULAR
NUMBER:  20696
SUBJECT: LIGO/Virgo G274296: Global MASTER Net  SN bright detection during GW error box inspection
DATE:    17/02/19 08:19:17 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>

V.M.  Lipunov, V.Shumkov, N.Tyurina, E. Gorbovskoy, V.G.
  O.Gress, Kornilov, P.Balanutsa, A.Kuznetsov, M.I.Panchenko
Lomonosov Moscow State University, 
Sternberg Astronomical Institute

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

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

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


MASTER OT J042250.16-820415.4 discovery - PSN in low surface brightness 
galaxy



MASTER-OAFA (Argentina, San Huan Uni) auto-detection system discovered OT 
source at (RA, Dec) =  04h 22m 50.16s -82d 04m 15.4s on 2017-02-19.12023 
UT during LIGO/VIRGO alert inspection  (Peter Shawhan, GCN 20689) .

The OT unfiltered magnitude is 15.9m (limit 20.0m).

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

We have reference image without OT on 2016-09-25 03:50:02 UT with 
unfiltered  magnitude limit 20.0m.

There is Galalaxy   ESO 15-10 with offset:P  d_ra 0.1E   ddec 1.6N.

Spectral observations are required.

The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/042250.16-820415.4_S0swHrk.png
http://observ.pereplet.ru/images/PSN042250.1-820415.4.jpg