TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4833
SUBJECT: GRB 060218/SN 2006aj: REM optical and near-infrared observations
DATE:    06/02/25 16:53:52 GMT
FROM:    Daniele Malesani at SISSA-ISAS,Trieste,Italy  <malesani@sissa.it>

S. Covino, D. Malesani, E. Molinari, G. Chincarini, F.M. Zerbi, V.  
Testa, G. Tosti, F. Vitali, L.A. Antonelli, P. Conconi, G. Cutispoto, G. 
Malaspina, L. Nicastro, E. Palazzi, E. Meurs, P. Goldoni, on  behalf of 
the REM/ROSS team, report:

We imaged the field of GRB 060218 (Cusumano et al., GCNs 4775, 4781) 
with the  robotic 60-cm REM telescope located at La Silla, Chile. 
Observations  were performed on 2006 Feb 25 from 00:16 to 00:30 UT under 
mediocre conditions just after the La Silla sunset with the R and J 
filters. REM is equipped with the REMIR near-infrared camera (10x10 
arcmin^2 FoV, JHK filters) and the ROSS optical spectrograph/imager 
(10x10 arcmin^2 FoV, VRI filters and AMICI prism).

The optical counterpart (Cusumano et al., GCN 4775; Marshall et al., GCN 
4779; Mirabal et al., GCN 4784) was detected in both bands with magnitudes:

R = 17.05 +- 0.17
J = 16.90 +- 0.20

Calibration was based on the SDSS and 2MASS catalogs for the optical and 
near-infrared observations, respectively.

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