M.Cwiok,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 ).
The wide field "Pi of the Sky South" telescope, installed in
the private observatory of Alain Maury in San Pedro de Atacama
(http://grb.fuw.edu.pl/pi/index.html#spda_site.htm) observed field of
XRF 120118A few minutes before and ~100s after the flash.
No new source brighter than about 11.3 mag has been identified on 10s
exposures and no source brighter than 11.7 mag on 20 coadded frames:
t_start - t0 [s] t_exp start (UT) end (UT) 3-sigma limit
-290 10s 06:00:14 06:00:24 11.2
+99 10s 06:06:43 06:06:53 11.3
+129 20x10s 06:07:13 06:12:12 11.7
where limit is based on the reference star magnitudo in V filter.
We acknowledge great support received from Alain Maury at SPdA Observatory.