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GCN Circular 12855

XRF 120118A: early optical limit by "Pi of the Sky"
2012-01-18T21:39:20Z (12 years ago)
Agnieszka Majczyna at Nat.Center for Nuclear Res. <>
T.Batsch,A.Majcher,A.Majczyna,K.Nawrocki,M.Sokolowski,G.Wrochna (NCBJ,
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 ( ).

The wide field "Pi of the Sky South" telescope, installed in
the private observatory of Alain Maury in San Pedro de Atacama
( 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.
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