TITLE:   GCN CIRCULAR
NUMBER:  21499
SUBJECT: LIGO/Virgo G297595: MASTER MASTER Bright PSN detection in error-box
DATE:    17/08/16 18:33:47 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov2007@gmail.com>

V.M.  Lipunov, E. Gorbovskoy, V.G.Kornilov, N.Tyurina, V.Shumkov, D.Kuvshinov, 
P.Balanutsa,  O.Gress, A.Kuznetsov, M.I.Panchenko, A.V.Krylov, I.Gorbunov
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

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

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

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

Following Katsavounidis et al. (GCN 21474), we report two optical 
transients detected.



1) MASTER OT J030141.96-230037.8 discovery

During MASTER-OAFA inspection of LIGO GW G297595
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic 
Net",
Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 03h 
01m 41.96s -23d 00m 37.8s on 2017-08-16.31422 UT.
The OT unfiltered magnitude is 17.5m (mlim=19.7m).

The OT is seen in 2 image (MASTER inspection mode) at 2017-08-16 07:32:29 
and 2017-08-16 07:17:07UT

There is no minor planet at this place.

We have reference images without OT on 2017-03-10.01 UT with magnitude 
limit in unfiltered 18.6m.

Spectral observations are required.


The discovery and reference images are available 
at:http://master.sai.msu.ru/static/OT/030141.96-230037.8.png


2) MASTER OT J015849.50-230853.7 detection

MASTER-OAFA auto-detection system  discovered OT source at (RA, Dec) = 01h 
58m 49.50s -23d 08m 53.7s on 2017-08-15.27118 UT.

The OT unfiltered magnitude is 16.7m (mlim=19.3m).
The OT is seen in 3 images. There is no minor planet at this place.
We have reference image without OT on 2016-09-22.25362 UT with unfiltered 
magnitude limit is 18.4m.
There is  USNO-B1 star in 2" with known only B1=21.47,B2=20.96

Spectral observations are required.

The discovery and reference images are available at:
http://master.sai.msu.ru/static/OT/015849.50-230853.7.png

This message can be citted.