GCN Circular 18234

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

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

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

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

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

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich
Blagoveschensk Educational State University, Blagoveschensk

V.Krushinski, I.Zalozhnih
Ural Federal University, Kourovka

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

Carlos Lopez, Claudio Mallamaci and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)



MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in SAAO was firstly pointed to the  GRB150902A (Roberts et. al. 
GCN 18229
Not found
 
 
) 67 sec after trigger time at 2015-09-02 17:36:47 UT. On our 
first (10s exposure)  set we not  found  optical transient within FERMI 
error-box (ra=16 24 36 dec=-72 54 35 r=2.140000) brighter then 15.27. 
MASTER-SAAO robotic telescope  makes several alert and inspect 
observations inside actual (at that time) FERMI GBM error boxes, but all 
of that frames   located  far away from the final FERMI LAT  (Arimoto et. 
al GCN 18228
Not found
 
 
) error box and did not cover it.

MASTER-VWF very wide fileld cameras placed in MASTER-SAAO cover FERMI LAT 
error box at 2015-09-02 17:36:32.0 i.e. 47 sec after notice and 53 sec 
after trigger time, and imaging it continuously without time gaps till 
2015-09-02 17:43:00. We have not find OT inside FERMI LAT error box with 
upper limit 11.5m on single (5 second) and 12.8m ( on coadd of 12 frames 
with total exposure 60 s) images.

  The message may be cited.