A.J. Castro-Tirado, J. Gorosabel, A. de Ugarte Postigo,
S. Guziy and M. Jel�nek (IAA-CSIC), M. Karrer (Obs.
de Geneve), H.-J. Roeser (MPI Heidelberg), N. El�as-Rosa
(Obs. Astr. di Padova), O. Bogdanov (Nikolaev State Univ.)
and A. Aguirre (CAHA Almer�a)
"We have imaged a 6' x 6' region centred on the SWIFT/BAT
error box for the short/hard GRB 050724 (Covino et al.
GCNC 3665) with the 1.2-m Mercator telescope (+ Merope) at
the Observatorio del Roque de los Muchachos on La Palma
starting on July 24.890 UT (i.e. 8.8 hours after the
GRB) under good meteorological conditions. Within
the refined SWIFT/XRT position (Romano et al. GCNC 3669),
the co-added R-band image (5400 s exposure time) shows a
source close to the center of the 6.3 arcsec radius error
box, labelled as A by Bloom et al. (GCN Circ. 3672).
Coordinates yield: RA(2000) = 16 24 44.96, Dec(2000)
= -27 32 23.6 (+/- 0.5"). We measure R = 22.40 +/- 0.13
using the USNO-A2.0 star at RA(2000) = 16 24 44.55, Dec(2000)
= -27 32 59.9. This source is blue, since it is barely
detected in contemporaneous J- and K-band images obtained
at the 3.5-m telescope (+ Omega2000) at the German-Spanish
Calar Alto Observatory and in H-band frames obtained at the
3.5-m Telescope Nazionale Galileo (+ NICS) on La Palma. The
colours of objects B and C are also consistent with being
blue, in contrast to the redder galaxy labelled D. Further
observations are needed to confirm whether any of these
objects has any relationship to GRB 050724."
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