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GCN Circular 2970

GRB050123: optical limit 1.8h before GRB
2005-01-24T09:33:35Z (19 years ago)
Grzegorz Wrochna at Soltan Inst.for Nuclear Studies <>
M.Cwiok, K.Krupska, K.Kwiecinska, L.Mankiewicz, K.Nawrocki,
B.Pilecki, L.W.Piotrowski, G.Pojmanski, M.Sokolowski, D.Szczygiel,
G.Wrochna, on behalf of "Pi of the Sky / ASAS" collaboration

The GRB 050123 (GCN 2966) error box was observed by "Pi of the Sky"
apparatus at Las Campanas Observatory at 8:35 UT, i.e. 1h 48min
before the GRB. 3 exposures, 10s each, have been taken by 2 cameras.
No new object has been found within the HETE error box.
The limiting magnitude on 3 coadded frames is 12m (unfiltered).
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