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GCN Circular 20782

Subject
LIGO/Virgo G275697: MASTER automatic follow up detection
Date
2017-03-01T07:47:54Z (7 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov2007@gmail.com>
V.M.  Lipunov, E. Gorbovskoy, N.Tyurina, V.Shumkov,
  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

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

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

MASTER Global robotic Net observed G275697 error-box synchronousely by 
very wide field cameras (MASTER-VWFC 2x400 square degrees) with 
m_lim=11mag on the single 
images,
covering north (MASTER-Tunka) and south (MASTER-SAAO) parts of error-box.

MASTER-II   G275697 inspection started 29min05s after the trigger time, 
covering 338 degrees for 24h after the trigger time up to 20.5mag, 640 for 
36h after trigger time.

http://master.sai.msu.ru/static//ligo/db/G275697/151//img/ligo_master_2017-02-28-19-11-23.12.eb.png
http://master.sai.msu.ru/static//ligo/db/G275697/151//img/ligo_master_2017-02-28-19-11-23.eb.png


MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
started inspection of the the  LIGO/Virgo G275697
29min05s after the trigger time (18:57:31.375 Siellez et al GCN#20763)  on 
2017-02-27 19:26:36 UT.

The 5-sigma upper limit on the single images are 20.0-20.3, the summ are 
20.8 mag

MASTER-IAC  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
started inspection of the the  LIGO/Virgo G275697
after sunset 49min28s after the trigger time on2017-02-27 19:46:59


The 5-sigma upper limit on the single images are 20.0-20.3, the summ are 
20.8 mag


MASTER optical transients, detected during G275697 error-box inspection:

1) MASTER OT J225444.27+755459.8 discovery - not connected with trigger!

MASTER-IAC auto-detection system  ( Lipunov et al., "MASTER Global Robotic 
Net", Advances in Astronomy, 2010, 30L )  discovered OT source at (RA, 
Dec) = 22h 54m 44.27s +75d 54m 59.8s on 2017-02-26.93361 UT
with unfiltered m_OT= 16.9m (mlimit=19.1m).

The OT is seen in 8 images. We have reference image without OT on 
2015-08-18.99625 UT with unfiltered magnitude limit 19.6m.

There is no any sources in VIZIER inside 3", it means 22mag POSS limit in 
history and Amplitude of curent outburst more then 5.1mag (as minimum)

Spectral observations are required.

The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/225444.27755459.8.png


2)  MASTER OT J104304.78+020550.2 detection - QSO activity

MASTER-SAAO auto-detection system  discovered OT source at (RA, Dec) = 10h 
43m 04.78s +02d 05m 50.2s on 2017-02-27.80508 UT.

The OT unfiltered magnitude is 18.5m  (mlim=20.0).

The OT is seen in 4 images. We have reference image on 2015-04-22.74625 UT 
with  unfiltered mlim=19.7m and m_QSO<~19.7.
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