[vsnet-grb-info 12958] GRB 130313A: Zadko observatory - Gingin optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14295
SUBJECT: GRB 130313A: Zadko observatory - Gingin optical observations
DATE:    13/03/13 18:15:55 GMT
FROM:    Alain Klotz at IRAP-CNRS-OMP  <Alain.Klotz at free.fr>

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

We imaged the field of GRB 130313A detected by SWIFT
(trigger 550906) with the Zadko robotic telescope (D=100cm)
located at the observatory - Gingin, Australia.

The observations started 52.3s after the GRB trigger
(34.2s after the notice). The elevation of the field increased from
19 degrees above horizon and weather conditions
were good.

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any optical transcient with a limiting
magnitude of:
t0+52.3s to t0+112.3s : R > 17.2

The second image is 30.0s exposure in tracking mode:
t0+130s to t0+160s : R > 18.6

We co-added a series of exposures:
t0+131s to t0+320.0s : R > 19.3

Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.

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