TITLE:   GCN CIRCULAR
NUMBER:  20578
SUBJECT: GRB 170202A: MASTGlobal ER-Net bright OT nonmonotonic light curve
DATE:    17/02/02 21:28:25 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>

V. Lipunov, N.Tyurina, E. Gorbovskoy, V.V.Kornilov, 
D.Kuvshinov, P.Balanutsa,  A.Kuznetsov, V.V.Chazo, A.V.Krylov, I.Gorbunov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow 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

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

R. Podesta, Carlos Lopez and Federico Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory

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


MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Blagoveschensk was pointed to the  GRB170202.77 37 sec after 
notice time and 49 sec after trigger time at 2017-02-02 18:28:58 UT. On 
our first (10s exposure)  set we  found 1 optical transient within SWIFT 
error-box (ra=152.525 dec=5.00139 r=0.05) brighter then 16.5

RA, DEC = 10h 10m 03s.5 , + 5d 0m 41s.8
Mag = 16.2

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Tunka was pointed to the  GRB170202.77 69 sec after notice time 
and 85 sec after trigger time at 2017-02-02 18:29:33 UT. On our first (20s 
exposure)  set we  found  optical transient within SWIFT error-box 
(ra=152.525 dec=5.00111 r=0.05) brighter then 17.8.

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in SAAO was pointed to the  GRB170202.77 4070 sec after notice 
time and 4082 sec after trigger time at 2017-02-02 19:36:11 UT. On our 
18-th (180s exposure)  set we  found  optical transient within SWIFT 
error-box (ra=152.525 dec=5.00111 r=0.05) brighter then 17.00.

MASTER-Amur light curve   is 
available at http://master.sai.msu.ru/static/OT/MASTERGRB170202A.jpg