[AAVSO-HEN] GRB 071227: REM NIR and Optical observations

[grb at aavso.org]

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TITLE:   GCN CIRCULAR
NUMBER:  7149
SUBJECT: GRB 071227: REM NIR and Optical observations
DATE:    07/12/28 01:36:30 GMT
FROM:    Paolo D'Avanzo at INAF-OAB  <paolo.davanzo at brera.inaf.it>

P. D'Avanzo, S. Piranomonte, L.A. Antonelli, S. Covino, D. Fugazza, L. 
Calzoletti, S. Campana, G.  Chincarini, M.L. Conciatore, S. Cutini, V. 
D'Elia, F. Dalessio, F.  Fiore, P. Goldoni, D. Guetta,  C. Guidorzi, 
G.L. Israel, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, 
E. Pian, L.  Stella, G.  Stratta, G. Tagliaferri, G. Tosti, V.Testa, 
S.D. Vergani,  F. Vitali   report on behalf of the REM team:

The robotic 60-cm REM telescope located at La Silla (Chile) observed the 
field of the GRB 071227 (Sakamoto et al., GCN 7147). Observations were 
performed automatically in the both optical (R, I) and NIR (Z, J, H, K) 
filters at Dec 28.03611 (about 4.6 hours after the burst ) .

A preliminary analysis of the first set of R-band and H-band exposures 
does not reveal any optical afterglow candidate inside the XRT error box 
(Sakamoto et al., GCN 7147)  We derive the following upper limits of R > 
17.0 (calibrated against USNO B1catalog) and H > 15.5 (calibrated 
against the 2MASS catalog).

Futher analysis are in progress.