TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2856 SUBJECT: GRB041217: NIR and optical observations with REM DATE: 04/12/18 15:02:22 GMT FROM: Gianpiero Tagliaferri at OAB-INAF Testa V., Tosti G., Monfardini A., Covino S., Tagliaferri G., Chincarini G., Zerbi F., Molinari E., Di Paola A., Rodono' M., Antonelli L.A., Conconi P., Cutispoto G., Nicastro L., Palazzi E., on behalf of the REM/ROSS team. We imaged in the NIR and optical bands with the REM 60cm robotic telescope at ESO-La Silla the central field of GRB041217, detected by the Swift Burst Alert Telescope (D. Palmer et al. GCN 2853). The observations were carried out on 2004, December 18, from 05:28 to 06:00 UT (i.e. 22 hours after the burst, as soon as the field was visible from the telescope site), with the REMIR near-IR camera (10x10 arcmin FOV, JHK filters) and with the ROSS spectrograph/imager in the optical (10x10 arcmin FOV, VRI filters). The observations were carried out under good seeing conditions, but with an airmass of about 2. The total exposure times were of J: 600s, H: 600s, K: 300s,V: 120s, R: 120s and I: 120s. The comparison with the 2MASS catalog did not reveal new IR sources at the limit of the catalog. Also the optical observations did not show any plausible candidates. New observation are planned for tonight. This message is citeable.