TITLE:   GCN CIRCULAR
NUMBER:  20237
SUBJECT: MASTER:  Optical Blazar Flare Detection during  Fermi trigger 502272781 inspection 
DATE:    16/12/06 14:56:09 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V.M. Lipunov, E.S. Gorbovskoy, N.Tyurina, E. Pogrosheva, E.Popova, 
V.Kornilov, D.Kuvshinov, P.Balanutsa, A.Kuznetsov, V.V.Chazov
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU

D.Buckley, S. Potter, A.Kniazev, 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

K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University

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

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Senik
Kislovodsk Solar Station of the Pulkovo Observatory

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

MASTER OT J233104.07-214815.6

MASTER-SAAO robotic telescope located at Sutherland (South Africa) 
started inspection ~ 10 h after  Fermi-GBM  TRIGGER_NUM: 502272781 .


MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER GlobalRobotic 
Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) 
= 23h 31m 04.07s -21d 48m 15.6s on 2016-12-01.78880 UT.
The OT unfiltered magnitude is 17.7m (mlim=19.5).
The OT is seen in 3 images made inside Fermi 502272781 trigger error-box.
We have reference images on 2016-10-18 21:24:18UT (mlim=19.2), on 
2015-09-13.88900 UT with unfiltered mlim= 19.7m with marginally seen OT 
(USNO B1 source with B2=20.18, R2=20.29, BZQJ2331-2148 blazar, source from 
Swift catalog (D'Elia+, 2013), radio source, etc.).
Spectral and gamma, X-ray, radio - observations are required.


The discovery and reference images are available at:

http://master.sai.msu.ru/static/OT/233104.07-214815.6.png

The message may be cited.