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GCN Circular 12646

Subject
GRB 111209A optical limit by "Pi of the Sky"
Date
2011-12-09T23:59:27Z (12 years ago)
From
Marcin Sokolowski at Soltan Inst. Nuc Studies,Warsaw <marcin.sokolowski@fuw.edu.pl>
M.Sokolowski,A.Majcher,T.Batsch,A.Majczyna,K.Nawrocki,G.Wrochna (NCNR,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).

The wide field "Pi of the Sky South" apparatus, 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 the position
of GRB 111209A ( SWIFT trigger #590336 ).
Three 10s images of this field have been taken at 01:59:03 - 01:59:51 UT
( 5 hours 13 min 5 sec before the first BAT alert ). No new object can be
  seen within the error box and the limit on 3 coadded images is 12.7 mag.
After receiving the trigger from SWIFT, the field was observed 480 seconds
after the GRB. The field has been observed in time period from 7:20:09 to
7:44:25 UT, no new object brighter than 10.2 mag was observed on 10s 
images. The limit on 20 coadded images is 10.7 mag.
Limits are based on the reference star magnitudo in V filter.

We acknowladge great support received from Alain Maury at SPdA Observatory.
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