TITLE: GCN CIRCULAR NUMBER: 13193 SUBJECT: GRB 120328B: Pi of the Sky simultaneous upper limits DATE: 12/04/03 13:06:43 GMT FROM: Lech Wiktor Piotrowski at U Warsaw T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,M.Sokolowski,G.Wrochna (NCBJ, Swierk), M.Cwiok,L.W.Piotrowski,M.Zaremba,A.F.Zarnecki (University of Warsaw), K.Malek,L.Mankiewicz,R.Opiela,M.Siudek,V.Repei (CFT PAN), G.Kasprowicz (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 coordinates of the GRB 120328B prior, during and after the reported IPN flash detection. No new source was identified. Following limiting magnitudes have been set: t_start - t0 [s] t_exp start (UT) end (UT) 3-sigma limit -15 10s 06:26:06 06:26:16 11.6 +1 10s 06:26:22 06:26:32 11.6 +16 10s 06:26:37 06:26:47 11.6 -165 20x10s 06:23:36 06:28:32 12.2 +152 20x10s 06:28:53 06:33:54 12.3 where limit is based on the reference star magnitudo in V filter. We acknowledge support received from Alain Maury at SPdA Observatory.