GCN Circular 11981

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

E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, 
N.Shatskiy, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. 
Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich
Sternberg Astronomical Institute, Moscow State University

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

V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov
Ural State University, Kourovka

V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina
Blagoveschensk Educational State University, Blagoveschensk


First we pointed to FERMI trigger N325523188 (ra=217.133 dec=-12.333
err=32.42) at 15:07:28 (62 sec after trigger time). We observed this area 
to 15:08:33, until the next more exact FERMI  alert  (ra=205.160 
dec=-11.570 err=10.9) comes.
Unfortunately, after that replacement, the part of MAXI error-box has left 
a FOV of ours widefield cameras. We observ this new place to 15:13:33.

We coadd all wide field (500 square degrees) camera unfiltered images. 
There is no OT from automatical identification. 
So we have following results:


T_start     T_s-T_fermi     T_s-T_maxi     exptime    limit    Cover_MAXI
15:07:28       62 sec        -68 sec        55 sec     13.0      100 %
15:08:33      126 sec         -3 sec       250 sec     13.8       85 %

First  epoch image 
http://observ.pereplet.ru/images/evgeny/grb110426a1.jpeg
Second epoch image 
http://observ.pereplet.ru/images/evgeny/grb110426a2.jpeg
Black lines is MAXI error_box.

  The main  MASTER  telescopes (40 sm) also made observations in 
2 polarizations, in the center of each of FERMI error-boxes, but them FOV 
(4 sq. degree) it has appeared not enough for observ at least parts MAXI
error-box.