[vsnet-grb-info 5337] GRB 071031: REM NIR and Optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  7025
SUBJECT: GRB 071031: REM NIR and Optical observation
DATE:    07/10/31 06:17:40 GMT
FROM:    Angelo Antonelli at Obs. Astro. di Roma  <a.antonelli at oa-roma.inaf.it>

L.A. Antonelli, S. Covino, P. D'Avanzo, 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, S.
Piranomonte, 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 071031 (Stroh et al., GCN 7020). Observations was
performed automatically in the both optical (R, I) and NIR (Z, J, H, K) 
filters
under poor seeing condition starting  at 01:08:19 UT (about 46 sec 
after the
alert and 102 sec after the burst ) .

A preliminary analysis of the first set of R-band and H-band exposures 
does
not reveal the optical afterglow candidate reported by Stroh et al., 
(GCN 7020),
Kruehler et al. (GCN 7021) and Haislip et al. (GCN. 7022).  We derive 
the
following upper limits of R > 16.4 (calibrated against USNO B1catalog) 
and
H > 13.8 (calibrated against the 2MASS catalog).

Futher analysis are in progress.