P. D'Avanzo, S. Covino, L.A. Antonelli, D. Malesani, D. Fugazza, L.
Calzoletti, S. Campana, G. Chincarini, M.L. Conciatore, S. Cutini, V.
D'Elia, F. D'Alessio, F. Fiore, P. Goldoni, D. Guetta, C. Guidorzi,
G.L. Israel, E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L.
Nicastro, E. Palazzi, E. Pian, S. Piranomonte, L. Stella, G. Stratta,
G. Tagliaferri, G. Tosti, V.Testa, S.D. Vergani, F. Vitali report on
behalf of the REM team:
Following the KAIT detection of the optical afterglow of GRB 080727B (Li
et al. GCN 8024) we performed a detailed off-line analysis of our REM
images (D'Avanzo et al., GCN 8023). While we confirm the non-detection
of the optical afterglow in the R-band down to the 16th magnitude (30 s
of total exposure), we find a barely visible object in our coadded
H-band frame (50 s of total exposure) with a magnitude of H = 11.8 � 0.2
(calibrated against the 2MASS catalogue) at a position consistent with
the one reported by Li et al.
Unfortunately, just after taking the first R and H-band images, the
telescope experienced tracking problems, due to the low altitude of the
object with respect to the horizon, and we do not have more images of
this GRB. The inferred unabsorbed color (R-H = 3.24 mag) is consistent
with the hypothesis of an highly absorbed or high redshift event
(Landsman et al. GCN 8033).