TITLE:   GCN CIRCULAR
NUMBER:  20711
SUBJECT: LIGO/Virgo G274296: PSN MASTER OT J042250.16-820415.4 is before maximum 
DATE:    17/02/21 12:46:23 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>

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

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

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

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-SAAO reobserved PSN  MASTER OT J042250.16-820415.4, discovered on 
2017-02-19.12023UT (Lipunov et al., GCN 20696)  in W,BVRI .

This PSN arises, so it has possibility to explode on the 17th of Feb 2017 
(Peter Shawhan, GCN 20689) .

Preliminary photometry is the following:
     Date       UT            mag
2017-02-19 02:37:46 UT      W=16.3 (discovery date)
2017-02-19 19:25:59 UT      W=16.2
2017-02-20 19:23:54 UT      W=15.7
2017-02-20 18:43:57 UT      V=16.0
2017-02-20 19:07:59 UT      I=15.9
2017-02-20 19:07:59 UT      R=16.0

The spectroscopy observations are required  its age and type 
determination.

Light curve is available at 
http://master.sai.msu.ru/static/OT/MASTEROTJ04225016-8204154.jpg