[vsnet-grb-info 11587] GRB 120224A: FTN optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  12982
SUBJECT: GRB 120224A: FTN optical observations
DATE:    12/02/24 10:11:35 GMT
FROM:    Jure Japelj at U. of Ljubljana,Slovenia  <jure.japelj at fmf.uni-lj.si>

J. Japelj, D. Kopac (U. Ljubljana) and C. Guidorzi (U. Ferrara) report on
behalf of a larger collaboration:

The 2-m Faulkes Telescope North automatically began observing GRB 120224A
(Saxton et al., GCN 12980), starting at 04:44:40 UT on 2012 February 24.
We do not detect any optical counterpart inside the enhanced Swift-XRT
error circle (Osborne et al., GCN 12981) down to the following limiting
magnitudes:

Mid time from   Exp    Filter   Mag limit
trigger (min)   (sec)
-------------------------------------------
44.5            600    R        > 19.3
39.3            480    i'       > 18.6
-------------------------------------------

The magnitudes are calibrated against nearby USNO-B1.0 stars.