TITLE:   GCN CIRCULAR
NUMBER:  20712
SUBJECT: LIGO/Virgo G274296: MASTER new bright possible SN detection and inspection dinamic
DATE:    17/02/21 14:03:05 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>

V.M.  Lipunov,  E. Gorbovskoy, N.Tyurina, P.Balanutsa, V.Shumkov, 
V.G. O.Gress, 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

MASTER continues inspection of LIGO event G274296 (Shawhan et al. 
GCN20689, Lipunov et al. GCN20696). The cover map of MASTER inspection 
survey, the position of MASTER OTs inside LIGO error-box is presented at 
http://master.sai.msu.ru/static/MASTERGW170217full.jpg

MASTER OT J105519.53+365834.1 - bright PSN in 1.2"E,1.2"S from the center 
of  PGC032819  (Sc type   http://leda.univ-lyon1.fr/ledacat.cgi?PGC032819 )

  MASTER-Tunka (Near Baykal, Irkutsk, Russia) auto-detection system 
discovered optical transient at 
RA(2000)=10h 55m 19.53s +36d 58m 34.1s  on
2017-02-18 18:18:18UT with unfiltered m_OT=15.7 (MASTER W=0.2B+0.8R 
calibrated by USNO-B1 thousands stars in the field).
This PSN is seen on 3 images and is located in 1.2"E,1.2"S from the center 
of spiral  PGC032819 .

We have reference images without OT on 2016-01-01 21:12:22 with mlim=19.9, 
on 2016-12-25 21:56:41UT with mlim=18.8.

Spectral observatios are required.

The discovery and reference images are 
http://master.sai.msu.ru/static/OT/MASTEROTJ105519.53+365834.1.jpg