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GCN Circular 20732

Subject
LIGO/Virgo G274296: MASTER new OT
Date
2017-02-24T13:21:31Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov2007@gmail.com>
V.M.  Lipunov, V.Shumkov, E. Gorbovskoy, N.Tyurina, P.Balanutsa, 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. GCN 
20689, Lipunov et al. GCN 20696, GCN 20715; 20712; ). 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 J184722.28-834543.4 discovery - new optical transients, no 
known sources in VIZIER database.


MASTER-OAFA auto-detection system discovered OT source at (RA, Dec) = 18h 
47m 22.28s -83d 45m 43.4s on 2017-02-24.13990 UT with unfiltered 
m_OT=17.6m (mlimit=19.4m).

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

We have reference images without OT on 2017-01-26.20851 UT with 19.7m 
unfiltered magnitude limit in MASTER-OAFA, on 2016-08-05 18:16:52UT with 
mlim=19.5, on 2016-03-02 23:53:05 with mlim=20.0, 2015-04-26 23:34:52 with 
mlim=20.0, on2015-01-12 01:41:57UT with mlim=19.6 in MASTER-SAAO database.

There is no any known sources inside 8" in VIZIER database, it means 22mag 
of POSS historical limits and more then 4.4magnitude of current outburst 
amplitude.

Spectral observations are required.

The discovery and reference images are available at: 
http://master.sai.msu.ru/static/OT/184722.28-834543.4.png
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