[vsnet-grb-info 13131] GRB 130427A: Zadko observatory - Gingin optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14468
SUBJECT: GRB 130427A: Zadko observatory - Gingin optical observations
DATE:    13/04/27 17:43:48 GMT
FROM:    Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz at free.fr>

B. Gendre, A. Klotz (IRAP-CNRS-OMP), D. Macpherson (UWA/ICRAR),
D. Coward (UWA), M. Boer, K. Siellez, H. Dereli ,
O. Bardho (UNS-CNRS-ARTEMIS-OCA), A. Williams (PO-UWA),
R. Martin (PO-UWA) report:

We imaged the field of GRB 130427A detected by SWIFT
(trigger 554620) with the Zadko robotic telescope (D=100cm)
located at the observatory - Gingin, Australia.

The observations started 3.44h after the GRB trigger
(the event occured during the local afternoon).
The elevation of the field increased from
23 degrees above horizon and weather conditions
were good.

We detect the optical couterpart discovered by
Elenin et al. (GCNC 14450). The unfiltered images
are analyzed regarding the R magnitude of star
catalogues. The preliminary light curve is:

Tstart Tstop Rmag  1sig
(mins) (mins)
    207   219 15.50 0.1
    220   232 15.54 0.1
    238   250 15.37 0.1
    252   264 15.56 0.1
    265   277 15.51 0.1
    304   319 15.58 0.1
    447   450 16.27 0.2

Magnitudes are not corrected for galactic dust extinction.

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