M.Sokolowski,T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,J.Uzycki,G.Wrochna (IPJ, Swierk),
M.Cwiok,W.Dominik,L.W.Piotrowski,A.F.Zarnecki (University of Warsaw),
K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN),
G.Kasprowicz,M.Zaremba (Warsaw University of Technology),
from the "Pi of the Sky" collaboration (http://grb.fuw.edu.pl ).
M. Jelinek and A. J.Castro-Tirado (IAA-CSIC Granada) on behalf of a larger collaboration.
The wide field "Pi of the Sky North" apparatus installed in the BOOTES-1
station at ESAt/INTA-CEDEA in Mazagon (Huelva, Spain;
observed field of GRB 110402A at the time of Fermi-GMB and Swift-BAT triggers.
No new source brighter than 11 mag has been identified on 10s exposures:
t_start - t0 start (UT) end (UT) 3-sigma limit
-6 00:12:52 00:13:02 11.0
+7 00:13:05 00:13:15 11.0
where limit is based on the reference star magnitudo in V filter.