GCN Circular 2907
Subject
GRB041223: optical and NIR observations with REM
Date
2004-12-24T16:37:59Z (19 years ago)
From
Daniele Malesani at SISSA-ISAS,Trieste,Italy <malesani@sissa.it>
S. Covino, F.M. Zerbi, E. Palazzi, G. Chincarini, G. Tagliaferri, E.
Molinari, V. Testa, G. Tosti, A. Monfardini, A. Di Paola, M. Rodon�,
L.A. Antonelli, P. Conconi, G. Cutispoto, P. D'Avanzo, L. Nicastro, on
behalf of the REM/ROSS team, report:
We imaged the field of GRB 041223 (Tueller et al., GCN 2898; Burrows et
al., GCN 2901) with the robotic 60-cm REM telescope located at La Silla,
Chile. Observations were carried both in the NIR and in the optical, on
2004 Dec 24 from 02:37 UT to 03:11 UT (i.e. ~12 hours after the burst).
REM was equipped with the REMIR near-IR camera (10x10 sq arcmin FoV, JHK
filters) and the ROSS optical spectrograph/imager (10x10 sq arcmin FoV,
VRI filters).
Observations were performed under good seeing conditions. The net
exposure times were: J: 500s; H: 500s; K: 500s; V: 150s; R: 150s; I: 150s.
The comparison with the 2MASS catalog did not reveal new infrared
sources with S/N>5 at the limit of the catalog. In particular no source
is present at the position of the X-ray afterglow detected by Swift-XRT
(Burrows et al. GCN 2901) and of the optical transient reported by
Berger et al. (GCN 2902) and Malesani et al. (GCN 2903).
Also the optical observations, partly affected by the bright Moon, did
not show any convincing candidate. The 3-sigma upper limit in the R band
is R ~ 18.
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