[vsnet-grb-info 3139] GRB 060418: FRAM early afterglow observation

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4976
SUBJECT: GRB 060418: FRAM early afterglow observation
DATE:    06/04/18 19:04:46 GMT
FROM:    Martin Jelinek at Inst.Astrophys.Andalucia,Granada  <mates at iaa.es>

Martin Jelínek (IAA Granada, Spain),
Petr Kubánek (ISDC Versoix, Switzerland and ASU Ondrejov, Czech Rep.) and
Michael Prouza (Columbia University, USA and FZU Praha, Czech Rep.)
on behalf of the FRAM team, coordinated by FZU Praha, Czech Rep.

report:

The robotic telescope FRAM (part of the Pierre Auger
Observatory) located in Malargue, Argentina, observed the
Swift GRB 060418 (Falcone et al., GCN 4966) in fully automatic
mode (under control of RTS2), starting 51s after the GRB
trigger under thin cirrus. We detect the OT reported by UVOT
at 5 combined images (220s integration time) with mean
exposure time 3:11:12UT (~300s after the trigger) with R-band
magnitude 14.2+-0.2. We note, that our lightcurve seems to
peak at about this time - in agreement with observation of
PROMPT (Nysewander et al., GCN 4971).