TITLE: GCN CIRCULAR NUMBER: 8707 SUBJECT: GRB081222 optical limit by "Pi of the Sky" DATE: 08/12/22 16:23:11 GMT FROM: Marcin Sokolowski at Soltan Inst. Nuc Studies,Warsaw M.Cwiok, W.Dominik, G.Kasprowicz, A.Majcher, A.Majczyna, K.Malek, L.Mankiewicz, K.Nawrocki, L.W.Piotrowski, D.Rybka, M.Sokolowski, J.Uzycki, G.Wrochna, M.Zaremba, A.F.Zarnecki on behalf of "Pi of the Sky" collaboration http://grb.fuw.edu.pl During the night 20081222 the "Pi of the Sky" apparatus observed the position of GRB081222 in the sky scan mode. Three 10s images of this field have been taken at 02:10:44 - 02:11:21 ( 2 hours 43 min 16 sec before the GRB). No new object is seen within the error box and the limit is 12.5 magnitudo. After receiving the trigger from Swift, the field was observed 63s after the GRB. No new object has been found within the Swift-BAT error box. The limiting magnitude (unfiltered) on single 10s exposures is: 04:55:03 - 04:55:13 - 12.0 mag 04:55:16 - 04:55:26 - 12.0 mag 04:55:28 - 04:55:38 - 12.0 mag The field was observed until 06:00:17, no new object brighter then 12.0mag was observed. The limit on 20 coadded images is 12.5 mag.